1D-a01

MgB2 (1)ఏᑟ෭༷⎔ቃ䛻䛚䛡䜛㉸ఏᑟᑟయ䛾⇕㟁☢≉ᛶ䛾ホ౯㻌㼀㼔㼑㼞㼙㼍㼘㻌㼍㼚㼐㻌㼑㼘㼑㼏㼠㼞㼛㼙㼍㼓㼚㼑㼠㼕㼏㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼛㼒㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼏㼛㼚㼐㼡㼏㼠㼛㼞㻌㼡㼚㼐㼑㼞㻌㼏㼛㼚㼐㼡㼏㼠㼕㼛㼚㻌㼏㼛㼛㼘㼕㼚㼓㻌㻌ᐑ㔝㻌 ᏹᩯ䚸㻌 ∾ཎ㻌 ▱ᗈ䚸㻌 ᕝ㉺㻌 ᫂ྐ䚸㻌 ఫྜྷ㻌 ᩥኵ㻌 䠄㮵ඣᓥ኱䞉ᕤ䠅㻌㻹㻵㼅㻭㻺㻻㻌㻴㼕㼞㼛㼠㼛㻘㻌㻹㻭㻷㻵㻴㻭㻾㻭㻌㼀㼛㼙㼛㼔㼕㼞㼛㻘㻌㻷㻭㼃㻭㻳㻻㻱㻌㻭㼗㼕㼒㼡㼙㼕㻘㻌㻿㼁㻹㻵㼅㻻㻿㻴㻵㻌㻲㼡㼙㼕㼛㻌㻔㻷㼍㼓㼛㼟㼔㼕㼙㼍㻌㼁㼚㼕㼢㼑㼞㼟㼕㼠㼥㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼗㻞㻞㻤㻜㻥㻡㻟㻬㼗㼍㼐㼍㼕㻚㼖㼜㻌㻌䝹䝩䝹䝎䛾 ᗘศᕸ䜢⾲䛫䛶䛔䜛䛣䛸䛜䜟䛛䜛䚹㻝䠊䛿䛨䜑䛻㻌
㻠䠊ᮏ⿦⨨䛾タィ㉸ఏᑟ䝁䜲䝹䛾෭༷䜢ఏᑟ෭༷᪉ᘧ䛻䛩䜛䛣䛸䛷䚸㉸ఏᑟḟ䛻䚸䝃䞁䝥䝹㛗 40cm䚸䝃䞁䝥䝹 ᗘ 20K 䛾ᐇ⌧䜢┠ᣦ䝁䜲䝹䛾㐠㌿䜢ᐜ᫆䛻䛩䜛䛣䛸䛜䛷䛝䜛䚹㏆ᖺ䛷䛿䚸䝟䝹䝇䝁䛧䛯⿦⨨䛾タィ䜢⾜䛳䛯䚹ᑠᆺ⿦⨨ྠᵝ䛻䚸 ᐃᐊ䛿䝧䜲䜽䜲䝹䛻䜒ఏᑟ෭༷᪉ᘧ䜢᥇⏝䛧䜘䛖䛸䛩䜛◊✲䛜┒䜣䛻⾜䜟䝷䜲䝖䛷సᡂ䛩䜛䚹䝃䞁䝥䝹䝩䝹䝎䛾ఏ⇕䝟䝇䛸䛧䛶䚸❅໬䜰䜜䛶䛔䜛[1]䚹ఏᑟ෭༷䜢⏝䛔䛯䝟䝹䝇䝁䜲䝹䛿䚸஺ὶᦆኻ䛻䝹䝭䝙䜴䝮䜢⏝䛔䜛䚹䜎䛯䚸ᑠᆺ⿦⨨ྠᵝ䛻䝠䞊䝍䞊䜢䝃䞁䝥䜘䜚ᑟయ䛾 ᗘ䛜ୖ᪼䛧䚸䝁䜲䝹ෆ䛻 ᗘศᕸ䛜Ⓨ⏕䛩䜛䚹䝹䝩䝹䝎䛾୧➃䛻タ⨨䛩䜛䚹ᮏⓎ⾲䛿䚸䛣䛾⿦⨨䛾෭༷ヨ㦂䛭䛣䛷䚸ఏᑟ෭༷ᆺ䝟䝹䝇䝁䜲䝹䜢స〇䛩䜛ሙྜ䚸ఏᑟ෭༷䛻䛴䛔䛶ሗ࿌䛩䜛ணᐃ䛷䛒䜛䚹⎔ቃ䛻䛚䛡䜛㉸ఏᑟᑟయ䛾≉ᛶ䜢ᢕᥱ䛧䛯ୖ䛷䚸䝁䜲䝹䛾タཧ⪃ᩥ⊩ィ䜢⾜䛖ᚲせ䛜䛒䜛䚹䛭䛾䛯䜑䚸ఏᑟ෭༷⎔ቃ䛻䛒䜛㉸ఏᑟ[1]ᕝ㉺᫂ྐ㻌 ௚, ➨ 74 ᅇ 2006 ᖺᗘ᫓Ꮨప ᕤᏛ䞉㉸㟁ᑟ኱ᆺᑟయ䛾⇕ⓗ䞉㟁☢ⓗ≉ᛶ䛾ホ౯䛜㔜せ䛷䛒䜛䚹㻌
Ꮫ఍ㅮ₇ᴫせ㞟, p71
ᮏ◊✲䛷䛿䚸ఏᑟ෭༷⎔ቃ䛻䛚䛡䜛㉸ఏᑟ኱ᆺᑟయ䛾≉ᛶホ౯䜢⾜䛖䛣䛸䜢┠ⓗ䛸䛧䚸෭෾ᶵ䜢౑⏝䛧䛺䛔䛷ఏᑟ෭༷䛾 ᐃ✵㛫䜢ᵓ⠏䛩䜛䛯䜑䛾᳨ウ䜢⾜䛳䛯䚹㻞䠊㻞㻜㻷 䛾ఏᑟ෭༷⎔ቃ䛾ᵓ⠏᪉ἲ㻌኱ᆺᑟయ䛾≉ᛶ䜢ホ౯䛩䜛䛯䜑䛻䛿䚸ᩘ༑䝉䞁䝏䛾䝃䞁䝥䝹䛻䚸୍ᵝ䛺እ㒊☢ሙ䜢༳ຍ䛩䜛ᚲせ䛜䛒䜛䚹⌧ᅾᡃ䚻䛜ᡤ᭷䛧䛶䛔䜛኱ᆺᑟయ䛾≉ᛶホ౯⿦⨨䛾ᴫほᅗ䜢 Fig.1 䛻♧䛩䚹䛣䛾⿦⨨䛿䚸40cm 䛾୍ᵝ☢ሙ✵㛫䛜䛒䜚䚸䝃䞁䝥䝹✵㛫䛾 ᗘ䛿 4.2K䚸66K 䛚䜘䜃 77K 䛻䛩䜛䛣䛸䛜䛷䛝䜛䚹MgB2
ᑟయ䜔 YBCO ᑟయ䛾౑⏝ ᗘ䛸䛧䛶䛿䚸20K ⛬ᗘ䜒⪃䛘䜙䜜䛶䛔䜛䛯䜑䚸䝃䞁䝥䝹✵㛫䛾 ᗘ䜢 20K 䛻䝁䞁䝖䝻䞊䝹䛩䜛䛣䛸䜢┠ⓗ䛸䛧䛶䛔䜛䚹㉸ఏᑟ኱ᆺᑟయ䛾≉ᛶホ౯䛾㝿䛻䛿䚸እ㒊☢⏺༳ຍ䝬䜾䝛䝑䝖䜢౑⏝䛩䜛䚹ᡃ䚻䛾౑⏝䝬䜾䝛䝑䝖䛿ᾮయ䝦䝸䜴䝮ᾐₕ෭༷䛷㐠㌿䛩䜛䚹䛧䛯䛜䛳䛶ᐇ㦂᫬䛻䛿䝃䞁䝥䝹࿘ᅖ䛻ᾮయ䝦䝸䜴䝮䛜ᚲ䛪䛒䜛䚹䛭䛣䛷䚸ᾮయ䝦䝸䜴䝮୰䛻ᐦ㛢䛥䜜䛯ᐃᐊ䜢タ⨨䛧䚸ᾮయ䝦䝸䜴䝮䛷෭༷䛥䜜䛯 ᐃᐊ䛸䛾⇕ఏᑟ
Fig.1 A system to measure electromagnetic properties of䛸 ᐃᐊෆ䛾෭༷䜺䝇䛻䜘䜛⇕ఏ㐩䛻䜘䛳䛶䝃䞁䝥䝹䜢෭༷large superconducting conductor䛩䜛᪉ἲ䜢᥇⏝䛩䜛䚹 ㄪ䛿䚸䝃䞁䝥䝹䝩䝹䝎䛾୧➃䛻ྲྀ䜚௜䛡䛯䝠䞊䝍䞊䛻䜘䛳䛶⾜䛖䚹䜎䛯䚸䝃䞁䝥䝹䝩䝹䝎䛾㛗ᡭ᪉㻌ྥ䛾 ᗘศᕸ䜢ᆒ୍䛻䛩䜛䛯䜑䛻䚸䝃䞁䝥䝹䝩䝹䝎䛻䛿ఏ㻌⇕䝟䝇䜢タ⨨䛧䚸䝃䞁䝥䝹䝩䝹䝎㛗ᡭ᪉ྥ䛾⇕ఏᑟ⋡䜢☜ಖ䛩䜛䛣䛸䛸䛧䛯䚹
௒ᅇ䛿䜎䛪䚸 ᐃᐊෆ䛻෭༷䜺䝇䛜䛒䜛≧ែ䛷䚸ᑠ䛥䛔ᗘᕪ䛷䝃䞁䝥䝹䜢෭༷䛷䛝䜛䛛䛹䛖䛛䜢☜䛛䜑䜛䛯䜑䛻䚸ᑠᆺ䛾ヨస⿦⨨䜢స〇䛧䛶෭༷ᐇ㦂䜢⾜䛳䛯䚹䛣䛾 ᐃ್䛸ィ⟬್䛾ẚ㍑䜢⾜䛔䚸ᐇ㝿䛾⿦⨨䛻౑⏝䛩䜛⿦⨨䛾タィ䜢⾜䛖䚹㻟䠊ᑠᆺヨస⿦⨨䛾෭༷ᐇ㦂㻌௒ᅇ〇స䛧䛯ヨస⿦⨨䛾እほᅗ䜢 Fig.2 䛻♧䛩䚹䝧䜲䜽䝷䜲䝖䛷స〇䛧䛯෇⟄ᙧ䛾 ᐃᐊ䛾୰䛻䚸㛗䛥 10cm 䛾䝃䞁䝥䝹䝩䝹䝎䜢タ⨨䛧䛶䛔䜛䚹ఏ⇕䝟䝇䛻䛿䚸ᖹ⦅㖡⥺䜢౑⏝䛧䛯䚹䜎䛯䚸䝃䞁䝥䝹䝩䝹䝎䛾୧➃䛻䝠䞊䝍䞊䜢タ⨨䛧䚸 ᗘ䝁䞁䝖䝻䞊䝷䞊䛷୧➃䛾 ᗘ䜢ไᚚ䛩䜛䛣䛸䛻䜘䜚䚸䝃䞁䝥䝹䝩䝹䝎䛾 ᗘ䝁䞁䝖䝻䞊䝹䜢ྍ⬟䛻䛧䛶䛔䜛䚹ᾮయ❅⣲୰䛷䛣䛾⿦⨨䛾෭༷ヨ㦂䜢⾜䛔䚸 ᐃ⤖ᯝ䛸ィ⟬⤖ᯝ䛾ẚ㍑䜢⾜䛳䛯䚹ୖ㒊䛸ୗ㒊䛾䝠䞊䝍䞊䜢┤ิ䛻᥋⥆䛧䚸ୖ㒊䛾 ᗘ䜢 85K䚸90K䚸95K䚸100K䚸䛻ไᚚ䛧䛯䚹ୖ㒊䝠䞊䝍䞊䚸ୗ㒊䝠䞊䝍䞊䚸䛭䛾୰㛫䛾 3 ⟠ᡤ䛻 ᗘィ䜢タ⨨䛧䚸䝃䞁䝥䝹䝩䝹䝎䛾 ᗘศᕸ䜢 ᐃ䛧䛯䚹ィ⟬ᘧ䛿䚸䝃䞁䝥䝹䝩䝹䝎䛾ᶓ᩿㠃䛻 ᗘศᕸ䛜䛴䛛䛺䛔䛸䛧䛶䚸1 ḟඖ䛾ᐃᖖ⇕ఏᑟ᪉⛬ᘧ䛛䜙ồ䜑䛯䚹䜺䝇䛸䛾⇕ఏ㐩⋡䛿䚸ὶయ୰䛻ᆶ┤䛻⨨䛛䜜䛯ᖹᯈ䛾⇕ఏ㐩⋡䛸䛧䚸ቃ⏺᮲௳䛸䛧䛶䚸୧➃ᗘ䛾 ᐃ್䜢୚䛘䛶䛔䜛䚹Fig.3 䛻෭༷ヨ㦂䛾⤖ᯝ䛸 ᗘศᕸ䛾ィ⟬್䜢♧䛩䚹ྠᅗ䜘䜚䚸௒ᅇ⏝䛔䛯ィ⟬ᘧ䛿䚸䝃䞁䝥㻌
Fig.2 Schematic of a test system for conduction cooling㻌
Fig.3 Temperature distributions along a sample holder in thetest system for conduction cooling.

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第83回

2010年度秋季低温工学・超電導学会

1D-a02

MgB2 (1)㻹㼓㻮㻞㻛㻲㼑㻛㻿㼁㻿 ⥺ᮦ䜢⏝䛔䛯ᾮయỈ⣲⏝ᾮ㠃ィ䛾ᐇ㦂ⓗホ౯㻌㻌㻱㼤㼜㼑㼞㼕㼙㼑㼚㼠㼍㼘㻌㼏㼔㼍㼞㼍㼏㼠㼑㼞㼕㼦㼍㼠㼕㼛㼚㻌㼛㼒㻌㼍㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼘㼑㼢㼑㼘㻌㼟㼑㼚㼟㼛㼞㻌㼒㼛㼞㻌㼘㼕㼝㼡㼕㼐㻌㼔㼥㼐㼞㼛㼓㼑㼚㻌 㻌㻌㼣㼕㼠㼔㻌㼍㼚㻌㻹㼓㻮㻞㻛㻲㼑㻛㻿㼁㻿㻌㼣㼕㼞㼑㻌

7RWDO9ROWDJH 9

7RWDO9ROWDJH 9஭ୖ㻌 ᣅ㑻䠈᯳ᕝ㻌 ୍ᘯ䠄஑኱䠅䠗ᒣ⏣㻌 ㇏䠄ᮾᾏ኱䠅䠗ᑠᯘ㻌 ᘯ᫂䠈ᡂᑿ㻌 ⰾ༤䠄㻶㻭㼄㻭䠅䠗㟷ᮌ㻌 ஬⏨䠄䝆䜵䝑䜽ᮾ⌮♫䠅㻌㻵㻺㻻㼁㻱㻌㼀㼍㼗㼡㼞㼛䠈㻌 㻷㻭㻶㻵㻷㻭㼃㻭㻌㻷㼍㼦㼡㼔㼕㼞㼛㻌㻔㻷㼥㼡㼟㼔㼡㻌㼁㼚㼕㼢㻚㻕㻧㻌㼅㻭㻹㻭㻰㻭㻌㼅㼡㼠㼍㼗㼍㻌㻔㼀㼛㼗㼍㼕㻌㼁㼚㼕㼢㻚㻕㻧㻌㻌 㻷㻻㻮㻭㼅㻭㻿㻴㻵㻌㻴㼕㼞㼛㼍㼗㼕㻘㻌㻺㻭㻾㼁㻻㻌㼅㼛㼟㼔㼕㼔㼕㼞㼛㻌㻔㻶㻭㼄㻭㻕㻧㻌㻭㻻㻷㻵㻌㻵㼠䡏㼡㼛㻌㻔㻶㼑㼏㼏㻌㼀㼛㼞㼕㼟㼔㼍㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼠㼍㼗㼡㼞㼛㻬㼟㼏㻚㼗㼥㼡㼟㼔㼡㻙㼡㻚㼍㼏㻚㼖㼜㻌㻌䠍㻚㻌 䛿䛨䜑䛻㻌ᾮ㠃ィ䛸䛧䛶ືస䛩䜛䛣䛸䛜ศ䛛䛳䛯䚹䛧䛛䛧䚸ᾮ䛾෌඘ሸ㛤ᑗ᮶䛾Ỉ⣲䜶䝛䝹䜼䞊♫఍䛻䛚䛔䛶䚸Ỉ⣲䛿ᅽ⦰䜺䝇䛸䛧ጞ᫬䛻䝍䞁䜽ෆ䛻ᾮ䛜ṧ䛳䛶䛔䜛ሙྜ䛸ṧ䛳䛶䛔䛺䛔ሙྜ䛷䛶䛾฼⏝䜒⪃䛘䜙䜜䜛䛜䚸㍺㏦䜔㈓ⶶ䛻䛚䛔䛶䜘䜚ᐦᗘ䛾኱ฟຊ㟁ᅽ䛾෌⌧ᛶ䛜Ⰻ䛟䛺䛛䛳䛯䚹䛭䛧䛶䚸᢬ᢠయ䛾ฟ䛝䛺ᾮయỈ⣲䛸䛧䛶䛾฼⏝䛾᪉䛜ඃ఩䛷䛒䜛䚹䛩䛷䛻䚸䝻䜿䝑ຊ䛛䜙䚸䝍䞁䜽ෆ䛻ᾮ䛜ṧ䛳䛶䛔䜛ሙྜ䛿䚸ᾮ䛜ṧ䛳䛶䛔䛺䛔䝖䛾᥎㐍๣䛸䛧䛶ᾮయỈ⣲䛜฼⏝䛥䜜䛶䛔䜛䛜䚸䛭䛾䝍䞁䜽ෆሙྜ䛸ẚ㍑䛧䛶䝍䞁䜽ෆ䛾䜺䝇 ᗘ䛜ప䛔䛣䛸䛜ศ䛛䛳䛯䚹䛣䛾ᾮయ䛾ṧ㔞䛿䚸
᢬ᢠయ䜢⏝䛔䛯㞳ᩓⓗ䛺ィ 䛸䛺䛳䛾䛣䛸䛛䜙ฟຊ㟁ᅽ䛾෌⌧ᛶ䛜Ⰻ䛟䛺䛛䛳䛯ཎᅉ䛸䛧䛶䚸ᾮ㠃䛶䛔䜛䚹䛭䛣䛷䚸㧗⢭ᗘ䛷㐃⥆ⓗ ᐃ䛜ྍ⬟䛺ᾮ㠃ィ䛜ᚲせィ䛾ฟຊ㟁ᅽ䛜䝍䞁䜽ෆ䛾䜺䝇 ᗘ䛻ᙳ㡪䜢ཷ䛡䜔䛩䛔䛸䛔䛸䛥䜜䛶䛔䜛䚹ᾮయỈ⣲䛾ἛⅬ䛿኱Ẽᅽୗ䛷⣙ 㻞㻜㻌 㻷 䛷䛒䜚䚸䛖䛣䛸䛜⪃䛘䜙䜜䜛䚹㻌㻌⮫⏺ ᗘ䛜⣙ 㻟㻥㻌㻷 䛾 㻹㼓㻮㻞 ㉸㟁ᑟయ䛜ᾮయỈ⣲⏝䛾ᾮ㠃ィཧ⪃ᩥ⊩㻌䛸䛧䛶ᛂ⏝䛷䛝䜛ྍ⬟ᛶ䛜䛒䜛䚹ᚑ᮶䛾◊✲䛷䛿䚸⥺ᚄ 㻜㻚㻟㻌㻝㻚㻌 㻷㻚㻌㼀㼛㼙㼍㼏㼔㼕㻘㻌㼑㼠㻌㼍㼘㻚㻦㻌㼀㻱㻵㻻㻺㻌㻷㻻㻳㻭㻷㼁㻘㻌㼂㼛㼘㻚㻠㻠㻌㻔㻞㻜㻜㻥㻕㻌㻟㻢㻢㻌㼙㼙 䛾 㻹㼓㻮㻞㻛㻯㼡㻺㼕 ⥺ᮦ䜢⏝䛔䛯ᾮ㠃ィ䜢ᾮయỈ⣲୰䛷ヨ㦂㻞㻚㻌 㼅㻚㻌 㻺㼑㼙㼛㼠㼛㻘㻌 㼑㼠㻌 㼍㼘㻚㻦㻌 㻭㼎㼟㼠㼞㼍㼏㼠㼟㻌 㼛㼒㻌 㻯㻿㻶㻌 㻯㼛㼚㼒㼑㼞㼑㼚㼏㼑㻘㻌 㼂㼛㼘㻚㻤㻝㻌䛧䛯䛸䛣䜝䚸㻝㻌 㼙㼙 ௨ୗ䛾⢭ᗘ䛷ᾮ఩䜢 ᐃྍ⬟䛷䛒䛳䛯㼇㻝㼉䚹㻔㻞㻜㻜㻥㻕㻌㼜㻚㻞㻝㻣㻌䛧䛛䛧䚸ṇᖖືస䛥䛫䜛䛻䛿Ⓨ⇕㔞䛜 㻝㻜㻌 㼃 ௨ୖ䛸䛺䜚䚸ᐇ⏝໬䛾䛯䜑䛻䛿䛭䛾పῶ䛜ㄢ㢟䛸䛺䛳䛯㼇㻝㼉䚹䜎䛯䚸ᩘ್ィ⟬䛸⌮ㄽⓗ⪃ᐹ䛾୧᪉䛛䜙䚸⣽⥺໬䛚䜘䜃⮫⏺ ᗘ䛾పῶ䛜┬/HYHOGRZQ $/HYHOGRZQ $VW㟁ຊ໬䛻᭷ຠ䛷䛒䜛䛣䛸䜒ศ䛛䛳䛯㼇㻝㼉䚹䛭䛣䛷䚸ᮏ◊✲䛷䛿䚸/HYHOGRZQ $QG
ู䝅䞊䝇ᮦ䛾㐺⏝ྍ⬟ᛶ䜢᳨ド䛩䜛䛯䜑䛻䚸㻹㼓㻮㻞㻛㻲㼑㻛㻿㼁㻿/HYHOGRZQ $⥺ᮦ䜢⏝䛔䛶㉸㟁ᑟᘧᾮ㠃ィ䜢ヨస䛧䚸䛭䛾ືస≉ᛶ䜢ᾮయ䝦䝸䜴䝮ཬ䜃ᾮయỈ⣲୰䛷ᐇ㦂ⓗ䛻ホ౯䛧䛯䚹㻌㻌㻞㻚㻌 ᾮయ䝦䝸䜴䝮䜢⏝䛔䛯ணഛᐇ㦂㻌ヨᩱ⥺ᮦ䛿䚸⥺ᚄ 㻜㻚㻝㻌㼙㼙 䛾 㻹㼓㻮㻞㻛㻲㼑㻛㻿㼁㻿 ⥺ᮦ䛷䛒䜚䚸⮫⏺ ᗘ䛿⮬ᕫ☢ሙ୰䛷⣙ 㻟㻢㻌 㻷 䛷䛒䜛㼇㻞㼉䚹䛣䛾⥺ᮦ䜢䝧䞊䜽䝷䜲䝖䛾୰✵䝟䜲䝥ෆ䛻㓄⨨䛧䚸᭷ຠ㛗 㻟㻜㻜㻌 㼙㼙 䛾㉸㟁ᑟᘧᾮ㠃ィ䜢ヨస䛧䛯䚹㻹㼓㻮㻞 ⥺ᮦ䛾ୖ➃䛻䛿䚸䝬䞁䜺䝙䞁⥺䛾䝠䞊䝍䜢ྲྀ䜚௜䛡䛯䚹㻌ணഛᐇ㦂䛸䛧䛶䚸ᾮయ䝦䝸䜴䝮୰䛷ᾮ㠃ィ䛾ືస☜ㄆ䜢⾜








䛳䛯䚹ணഛⓗホ౯䛾⤖ᯝ䛛䜙䚸䝠䞊䝍⥺䜈䛿 㻟㻡㻜㻌 㼙㻭 䜒䛧䛟䛿
/HQJWKLQ*DV PP
㻠㻜㻜㻌㼙㻭䚸㻹㼓㻮㻞 ⥺ᮦ䜈䛿 㻝㻚㻜䡚㻝㻚㻞㻌㻭 䛾┤ὶ㟁ὶ䜢㏻㟁䛧䛯䚹㻲㼕㼓㻚㻝㻌㻱㼤㼜㼑㼞㼕㼙㼑㼚㼠㼍㼘㻌㼞㼑㼟㼡㼘㼠㼟㻌㼕㼚㻌㻸㻴㼑㻚㻌ᐃ䛿䚸ᾮ䛾඘ሸ᫬䛸⮬↛⵨Ⓨ᫬䛻⾜䛳䛯䚹⮬↛⵨Ⓨ᫬䛾ᐇ㦂⤖ᯝ䛾୍౛䜢 㻲㼕㼓㻚㻝 䛻♧䛩䚹㻹㼓㻮㻞 ⥺ᮦ䜈䛾㏻㟁㟁ὶ䛜㻝㻚㻜㻌 㻭 䛾䛸䛝䚸୙㐃⥆䛺⤖ᯝ䛜ᚓ䜙䜜䛯䚹䛧䛛䛧䚸㏻㟁㟁ὶ䜢/HYHOXS $㻝㻚㻝㻌㻭 䜒䛧䛟䛿 㻝㻚㻞㻌㻭 䛻ቑຍ䛩䜛䛸ᾮ఩䛸ฟຊ㟁ᅽ䛜 㻝 ᑐ 㻝 䛷/HYHOXS $ᑐᛂ䛧䚸ᾮ㠃ィ䛸䛧䛶ືస䛩䜛䛣䛸䛜☜ㄆ䛷䛝䛯䚹䛯䛰䛧䚸ᾮ
/HYHOXS $㠃ィୖ➃䛛䜙 㻢㻜㻌 㼙㼙 䛸 㻝㻥㻜㻌 㼙㼙 䛾఩⨨䛻䝞䝑䝣䝹ᯈ䛜䛒䜚䚸ฟຊ㟁ᅽ䛜䛭䛾ᙳ㡪䜢ከᑡཷ䛡䛶䛔䜛䛣䛸䜒☜ㄆ䛷䛝䜛䚹㻌㻌㻟㻚㻌 ᾮయỈ⣲䜢⏝䛔䛯ᮏᐇ㦂㻌ᾮయỈ⣲୰䛷ᾮ㠃ィ䛸䛧䛶䛾ືస☜ㄆ䜢⾜䛳䛯䚹ணഛⓗホ౯䛾⤖ᯝ䛛䜙䚸䝠䞊䝍⥺䜈䛿 㻟㻜㻜㻌㼙㻭 䜒䛧䛟䛿 㻠㻜㻜㻌㼙㻭䚸㻹㼓㻮㻞⥺ᮦ䜈䛿 㻜㻚㻡䡚㻜㻚㻣㻌 㻭 䛾┤ὶ㟁ὶ䜢㏻㟁䛧䛯䚹 ᐃ䛿ᾮ䛾඘ሸ᫬䛻⾜䛔䚸෌඘ሸ㛤ጞ᫬䛻䝍䞁䜽ෆ䛻ᾮ䛜ṧ䛳䛶䛔䜛ሙྜ䛸ṧ䛳䛶䛔䛺䛔ሙྜ䛜䛒䛳䛯䚹䛺䛚䚸䝍䞁䜽ෆ䛻䛿᢬ᢠయ䜢ྲྀ䜚௜䛡䚸㞳ᩓⓗ䛻ṇ☜䛺ᾮ఩䜢ᢕᥱ䛧䛯䚹ᾮ඘ሸ᫬䛾ᐇ




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
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㦂⤖ᯝ䛾୍౛䜢 㻲㼕㼓㻚㻞 䛻♧䛩䚹㻹㼓㻮㻞 ⥺ᮦ䜈䛾㏻㟁㟁ὶ䛜 㻜㻚㻡㻌
/HQJWKLQ*DV PP
㻭 䛾䛸䛝䚸୙㐃⥆䛺⤖ᯝ䛜ᚓ䜙䜜䛯䚹䛧䛛䛧䚸㏻㟁㟁ὶ䜢 㻜㻚㻢㻌㻭㻲㼕㼓㻚㻞㻌㻱㼤㼜㼑㼞㼕㼙㼑㼚㼠㼍㼘㻌㼞㼑㼟㼡㼘㼠㼟㻌㼕㼚㻌㻸㻴㻞㻚㻌䜒䛧䛟䛿 㻜㻚㻣㻌㻭 䛻ቑຍ䛩䜛䛸ᾮ఩䛸ฟຊ㟁ᅽ䛜 㻝 ᑐ 㻝 䛷ᑐᛂ䛧䚸― 74 ―

第83回

2010年度秋季低温工学・超電導学会

1D-a03

MgB2 (1)᪂䛧䛔ືసཎ⌮䛻ᇶ䛵䛔䛯㉸㟁ᑟᘧᾮ㠃ィ䛾ᥦ᱌㻌㻼㼞㼛㼜㼛㼟㼍㼘㻌㼛㼒㻌㼍㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼘㼑㼢㼑㼘㻌㼟㼑㼚㼟㼛㼞㻌㼎㼍㼟㼑㼐㻌㼛㼚㻌㼍㻌㼚㼑㼣㻌㼜㼞㼕㼚㼏㼕㼜㼘㼑㻌㼛㼒㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚㻌᯳ᕝ ୍ᘯ䠈஭ୖ ᣅ㑻䠄஑኱䠅䠗 ᒣ⏣ ㇏䠄ᮾᾏ኱䠅䠗 㟷ᮌ ஬⏨䠄䝆䜵䝑䜽ᮾ⌮♫䠅
KAJIKAWA Kazuhiro, INOUE Takuro (Kyushu Univ.); YAMADA Yutaka (Tokai Univ.); AOKI Itsuo (Jecc Torisha)
E-mail: kajikawa@sc.kyushu-u.ac.jp㻞䠊᪂䛧䛔ᾮ㠃ィ䛾ᵓ㐀䛸ືసཎ⌮㻌
Fig. 1 䛻䚸᪂䛧䛔㉸㟁ᑟᘧᾮ㠃ィ䛾ᇶᮏᵓ㐀䜢♧䛩䚹ᾮ㠃ィ䛾ឤ㒊䛿䚸㏆᥋䛧䛶ᖹ⾜䛻㖄┤㓄⨨䛧䛯 2 ᮏ䛾⥺ᮦ䠄㉸㟁ᑟ⥺ A 䛸㠀㉸㟁ᑟ⥺ B䠅䛷ᵓᡂ䛥䜜䜛䚹㠀㉸㟁ᑟ⥺ B 䛻䛚䛡䜛᢬ᢠ䛾 ᗘ≉ᛶ䛿䚸Fig. 2 䛻౛♧䛩䜛䜘䛖䛻䚸⮫⏺ ᗘ௨ୖ䛻䛒䜛㉸㟁ᑟ⥺ A 䛾ᖖ㟁ᑟ᢬ᢠ䛸඲䛟ྠ୍䛾≉ᛶ䜢♧䛩䛜䚸෭፹ ᗘୗ䛷䛿㟁Ẽ᢬ᢠ䝊䝻䛾㉸㟁ᑟ≧ែ䛻㌿⛣䛧䛺䛔䜒䛾䛸䛩䜛䚹䛣䛾 2 ᮏ䛾⥺ᮦ䜢㟁Ẽⓗ䛻┤ิ᥋⥆䛧䛶㐺ษ䛺┤ὶ㟁ὶ I 䜢㏻㟁䛩䜛䛸䚸㉸㟁ᑟ⥺ A 䛿ᚑ᮶䛾㉸㟁ᑟᘧᾮ㠃ィ䛸ྠᵝ䛻ືస䛧䛶䚸ᾮయ䛻ᾐₕ䛧䛯㒊ศ䛿㉸㟁ᑟ≧ែ䛷㟁Ẽ᢬ᢠ䝊䝻䛸䛺䛳䛶㟁ᅽ㝆ୗ䛜䛺䛟䚸䜎䛯䜺䝇୰䛾㒊ศ䛿⮫⏺ ᗘ௨ୖ䛾ᖖ㟁ᑟ≧ែ䠄᢬ᢠ≧ែ䠅䛸䛺䛳䛶㟁ᅽVG 䜢Ⓨ⏕䛩䜛䚹୍᪉䚸㠀㉸㟁ᑟ⥺ B 䛿䚸඲㛗䛜ᖖ䛻᢬ᢠ≧ែ䛾䜎䜎䛷䛒䜚䚸ᾮయ୰䛚䜘䜃䜺䝇୰䛾䛔䛪䜜䛾㒊ศ䛷䜒㟁ᅽ䜢Ⓨ⏕䛩䜛䚹䛯䛰䛧䚸䜺䝇୰䛾㒊ศ䛿㉸㟁ᑟ⥺ A 䛸ྠ୍䛾ᗘศᕸ䛸䛺䜚䚸⤖ᯝ䛸䛧䛶Ⓨ⏕㟁ᅽ䜒 VG 䛷ྠ୍䛸䛺䜛䚹䜎䛯䚸ᾮయ୰䛾㒊ศ䛻䛴䛔䛶䛿䚸ᅽຊ䛻ᛂ䛨䛯୍ᐃ䛾෭፹ ᗘ Tb䛻䛚䛡䜛᢬ᢠ R(Tb) 䜢⏕䛨䚸⤖ᯝ䛸䛧䛶ᾮయ䛻ᾐₕ䛧䛯⥺ᮦ㛗䛻ẚ౛䛧䛯㟁ᅽ VL = R(Tb) I 䛜Ⓨ⏕䛩䜛䚹䛭䛣䛷䚸㉸㟁ᑟ⥺A 䛾Ⓨ⏕㟁ᅽ VA = VG 䛸㠀㉸㟁ᑟ⥺ B 䛾Ⓨ⏕㟁ᅽ VB = VG +VL 䛾ᕪศ VB  VA 䜢䛸䜜䜀䚸㠀㉸㟁ᑟ⥺ B 䛾ᾮయ䛻ᾐₕ䛧䛯㒊ศ䛾㟁ᅽ VL 䛾䜏䛜ほ 䛥䜜䚸ᾮ఩䜢Ỵᐃ䛷䛝䜛䚹

Fig. 1 Basic structure of new type of superconducting level sensor.
40
SC wire A
Non-SC wire B
Resistance per unit length (:/m)

㻝䠊䛿䛨䜑䛻㻌
ᾮయỈ⣲⏝䛾㉸㟁ᑟᘧᾮ㠃ィ䛸䛧䛶䚸ᵝ䚻䛺䝅䞊䝇ᮦ䜢ᣢ䛴 MgB2 ⥺ᮦ䜢㐺⏝䛧䛯䜒䛾䛜䛣䜜䜎䛷䛻ヨస䚸ヨ㦂䛥䜜䛶䛔䜛[1–4]䚹㏻ᖖ䛾㉸㟁ᑟᘧᾮ㠃ィ䛾ືసཎ⌮䛿䚸ᾮయ䛸Ẽ໬䜺䝇䛾෭༷≉ᛶ䛾㐪䛔䜢฼⏝䛧䛶䛚䜚䚸㖄┤䛻㓄⨨䛧䛯㉸㟁ᑟ⥺䛻㐺ษ䛺┤ὶ㟁ὶ䜢㏻㟁䛩䜛䛸䚸䜺䝇୰䛾Ⓨ⇕䛸෭༷䛾⇕ⓗ䛺䝞䝷䞁䝇䛻䜘䜚䚸䜺䝇୰䛻㓄⨨䛥䜜䛯㒊ศ䛾䜏䛜᢬ᢠ䜢᭷䛩䜛ᖖ㟁ᑟ≧ែ䛸䛺䜚䚸㉸㟁ᑟ⥺䛾୧➃㟁ᅽ䜢 ᐃ䛩䜛䛣䛸䛷ᾮ㠃䛾఩⨨䠄ᾮ఩䠅䜢ᢕᥱ䛷䛝䜛[5]䚹䛧䛛䛧䚸Ỉ⣲䛿ྍ⇞ᛶ䜺䝇䛾䛯䜑䚸≉䛻ຍᅽ᤼ฟ䛾㝿䛻୙άᛶ䜺䝇䛷䛒䜛䝦䝸䜴䝮䛜౑⏝䛥䜜䜛≧ἣ䜒᝿ᐃ䛥䜜䚸඘ሸ᫬䛾⣧Ỉ⣲䜺䝇㞺ᅖẼ䜒ే䛫䛶䚸」ᩘ䛾✀㢮䛾䜺䝇୰䛷ᾮ㠃ィ䛜ṇᖖ䛻ືస䛩䜛䛣䛸䛜せồ䛥䜜䜛䚹䛭䛣䛷௒ᅇ䚸෭༷≉ᛶ䛾␗䛺䜛䜺䝇୰䛷䜒ฟຊ䛜୍ᐃ䛸䛺䜛᪂䛧䛔㉸㟁ᑟᘧᾮ㠃ィ䜢⪃᱌䛧䛯䛾䛷䚸䛭䛾ᵓ㐀䛸ືసཎ⌮䚸䛚䜘䜃ᩘ್ゎᯒ䜢⏝䛔䛯ືస≉ᛶ䛾ணഛⓗ᳨ド䛾⤖ᯝ䛻䛴䛔䛶ሗ࿌䛩䜛䚹

20

10

0

0

50

100

150

200

Temperature (K)Fig. 2 An example of temperature dependence of resistances
per unit length for SC wire A and non-SC wire B.
Wire length located in cryogenic gas (mm)
300
2

200

100

0
VA
VB
VB  VA

Voltage (V)㻟䠊ᩘ್ゎᯒ䛻䜘䜛ືస᳨ド㻌
Fig. 3 䛻䚸ᩘ್䝅䝭䝳䝺䞊䝅䝵䞁[3]䛻䜘䜛⤖ᯝ䜢♧䛩䚹䛯䛰䛧䚸⥺ᮦ඲㛗䛿 300 mm 䛷䛒䜛䚹㉸㟁ᑟ⥺ A 䛾ฟຊ VA 䠄◚⥺䠅䛿䚸ᚑ᮶䛾ᾮ㠃ィ䛸ྠᵝ䛻䜺䝇୰䛾⥺ᮦ㛗䛸 1 ᑐ 1 䛻ᑐᛂ䛩䜛䛜䚸Fig. 2 䛻♧䛩䜘䛖䛺ᖖ㟁ᑟ᢬ᢠ䛾 ᗘኚ໬䛻㉳ᅉ䛧䛶⥺ᙧᛶ䜢♧䛥䛺䛔䚹୍᪉䚸㠀㉸㟁ᑟ⥺ B 䛾ฟຊ VB 䠄Ⅼ⥺䠅䛸䛾ᕪศ䛷䛒䜛᪂䛧䛔ᾮ㠃ィ䛾ฟຊ䠄ᐇ⥺䠅䛿ᾮయ୰䛾⥺ᮦ㛗䛻ẚ౛䛧䚸ᾮ㠃ィ䛸䛧䛶㠀ᖖ䛻ඃ䜜䛶䛔䜛䛣䛸䛜䜟䛛䜛䚹ཧ⪃ᩥ⊩
1. Ch. Haberstroh, et al.: Adv. Cryo. Eng. 51 (2006) 679
2. M. Takeda, et al.: IEEE Trans. Appl. Supercond. 19 (2009) 764
3. K. Tomachi, et al.: TEION KOGAKU 44 (2009) 366
4. T. Inoue, et al.: Abst. CSJ Conf. 83 (2010) 1D-a02
5. M. Ishizuka, et al.: TEION KOGAKU 3 (1968) 131

30

1

0

0

100

200

300

Wire length located in cryogenic liquid (mm)Fig. 3 Numerical results of terminal voltages for SC wire A
and non-SC wire B, and their difference as a function of wire
length located in cryogenic liquid.

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MgB2 (1)HPCVD ἲ䛻䜘䜚స〇䛧䛯䝏䝹䝖 MgB2 ⷧ⭷䛾㍺㏦⮫⏺㟁ὶ≉ᛶTransport critical current properties of tilted MgB2 films synthesized by HPCVD methodᒣᮏ ᫂ಖ (ᮾ኱); 䝬䝸䝘䞉䝥䝑䝔䜱 (䜲䝍䝸䜰Ꮫ⾡఍㆟ CNR-SPIN䠈䝆䜵䝜䝞኱); 䜰䝘䝖䝸䞊䞉䝫䝸䝲䞁䝇䜻䞊, ட㇂ ᩥ೺,䝗䝭䝖䝻䞉䜰䝤䝷䜲䝰䝣, 䜰䝺䜽䝃䞁䝎䞊䞉䜼䝳䝺䝡䝑䝏, 䝕䝡䝑䝗䞉䝷䝞䝺䝇䝔䜱䜶 (⡿ᅜ❧ᙉ☢ሙ◊);䝏䜵䞁䜺䞁䞉䝏䝳䜰䞁, 䝅䝱䜸䝅䞁䞉䝅 (⡿䝔䞁䝥䝹኱); ୗᒣ ῟୍, ᓊᑿ ග஧ (ᮾ኱)
YAMAMOTO Akiyasu (Univ. of Tokyo); PUTTI Marina (CNR-SPIN, Genova Univ.); POLYANSKII Anatolii,
KAMETANI Fumitake, ABRAIMOV Dmytro, GUREVICH Alexander, LARBALESTIER David (NHMFL);ZHUANG Chenggang, XI Xiaoxing (Temple Univ.); SHIMOYAMA Jun-ichi, KISHIO Kohji (Univ. of Tokyo)
E-mail: yamamoto@appchem.t.u-tokyo.ac.jp
1. ࡣࡌࡵ࡟
㔠ᒓ⣔㉸ఏᑟయ䛷᭱䜒㧗䛔⮫⏺ ᗘ(Tc ~40 K)䜢ᣢ䛴 MgB2
䛿䠈ᾮయ䝦䝸䜴䝮䝣䝸䞊䛾 20 K ㏆ഐ䛷䛾ᛂ⏝䛻ྥ䛡䛶✚ᴟⓗ䛻◊✲䛜㐍䜑䜙䜜䛶䛔䜛䠊MgB2 䛿ప䛔␗᪉ᛶ䛸㛗䛔㉸ఏᑟ䝁䝠䞊䝺䞁䝇㛗䛻⏤᮶䛧䛶䠈ከ⤖ᬗయ䛻䛚䛔䛶䜒㍺㏦㟁ὶ䛿ᐜ᫆䛻ὶ䜜䜛䛸⪃䛘䜙䜜䛶䛝䛯䠊䛧䛛䛧䠈㏆ᖺ䛾◊✲䛛䜙 MgB2 ከ⤖ᬗయ
䛾㍺㏦≉ᛶ䛿༢⤖ᬗ➼䛛䜙ண᝿䛥䜜䜛≉ᛶ䛸ẚ㍑䛧䛶ᢚไ䛥䜜䛶䛔䜛䛣䛸䛜᫂䜙䛛䛸䛺䛳䛶䛝䛶䛔䜛䠊୍᪉䠈MgB2 䛿 2 䝞䞁䝗㉸ఏᑟయ䛷䛒䜚䠈c ㍈᪉ྥࡢ㍺㏦ࢆ୺࡟ᢸ࠺Sࣂࣥࢻࡢᣲືࡣከ⤖ᬗయࡢ㍺㏦≉ᛶ࡟ᙉ࠸ᙳ㡪ࢆ୚࠼ࡿ࡜ண᝿ࡉࢀࡿࡀ㸪㟁ὶ
㍺㏦≉ᛶ࡟࠾ࡅࡿ࣐ࣝࢳࣂࣥࢻຠᯝࡣࡼࡃศ࠿ࡗ࡚࠸࡞࠸㸬ᮏ◊✲࡛ࡣ c ㍈ࡀ 19 ᗘഴ࠸ࡓ࢚ࣆࢱ࢟ࢩࣕࣝ MgB2 ⷧ⭷ࢆస〇ࡋ㸪ࡑࡢ㍺㏦⮫⏺㟁ὶ≉ᛶࢆホ౯ࡋࡓ㸬ࡇࡢⷧ⭷ࡣࢳࣝࢺ᪉ྥ࡜ᆶ┤࡟Ⓨ㐩ࡋࡓ㝵ẁ≧ࡢࢫࢸࢵࣉᵓ㐀ࢆ᭷ࡋ㸪ࢫࢸࢵࣉ࡟ᑐࡋᖹ⾜࡟ ab 㠃ࢆὶࢀࡿ JL ࡜㸪ᆶ┤᪉ྥ࡟ ab 㠃
࡜ c ㍈᪉ྥࡢ୧᪉ࢆὶࢀࡿ JT ࡢ 2 ✀ࡢ㟁ὶࢆ⏕ࡌࡿ㸬୧ࣂࣥࢻࡀఏᑟ࡟ᐤ୚ࡍࡿ JL ࡟ᑐࡋ࡚㸪JT ࡣVࣂࣥࢻࡀᨃ 2 ḟඖⓗ࡛࠶ࡿࡇ࡜࡟⏤᮶ࡋ࡚୺࡟Sࣂࣥࢻ࡟ࡼࡗ࡚ᢸࢃࢀࡿ࡜⪃࠼ࡽࢀࡿࡇ࡜࠿ࡽ㸪ࡇࢀࡽ 2 ✀ࡢ㟁ὶࢆ ᗘ㸪☢ሙࢆኚ໬ࡉࡏ࡚ ᐃࡍࡿࡇ࡜࡛㸪Sࣂࣥࢻࡢ㍺㏦≉ᛶ࡟ཬࡰࡍᙳ㡪ࢆホ౯ࡍࡿࡇ࡜ࢆ┠ᣦࡋࡓ㸬

JcL
JcT

Jc (A/cm2)

106

105

104

103

10 K
H ԋ film

0

1

2

3

4

H (T)

108

(b)
Jc (A/cm2)

107

Jc (A/cm2)

107

106

105

0

0.2

0.4
0.6
H/Hirr

0.8

6

10

JcL
JcT
10 K
H // film
5

10

0

2

4

6

8

10

H (T)

Fig. 1. Magnetic field dependence of JcL and JcT at 10 K for the 100 nm
MgB2 tilted film in field perpendicular (a) and parallel (b) to the film.
Inset of (b) shows JcL and JcT as a function of normalized field H/Hirr.
2.5
JcL (H // film)
JcT (H // film)
JcL (Hԋfilm)
JcT (Hԋfilm)

22
7

3. ⤖ᯝ࡜⪃ᐹ䝏䝹䝖 MgB2 ⷧ⭷䛾 10 K 䛻䛚䛡䜛 2 ✀䛾㉸ఏᑟ㟁ὶ JL 䛸 JT
䛾 Jc 䛾☢ሙ౫Ꮡᛶ䜢 Fig. 1(a), (b)䛻♧䛩䠊ⷧ⭷⾲㠃䛻ᆶ┤䛻እ㒊☢ሙ䜢༳ຍ䛧䛯ሙྜ(a)䠈JL 䛿 JT 䜘䜚䜒ᖖ䛻㧗䛔 Jc 䜢♧䛧䛯䠊୍᪉䠈ᖹ⾜☢ሙୗ(b)䛻䛚䛔䛶䛿䠈ప☢ሙୗ䛷 JcL 䛜㧗䛟䠈㧗☢
ሙୗ䛷䛿 JcT 䛜㧗䛟䛺䜛ᣲື䛜䜏䜙䜜䠈2 T ௜㏆䛻䜽䝻䝇䜸䞊䝞䞊䛜⏕䛨䛯䠊䛣䜜䛿 JT 䛾䝆䜸䝯䝖䝸䛷䛿☢ሙ䛿 ab 㠃䛻ᑐ䛧䛶ᖹ⾜䛷䛒䜛䛾䛻ᑐ䛧䠈JL 䛷䛿 19 ᗘ䛪䜜䛶䛔䜛䛯䜑䠈ୖ㒊⮫⏺☢ሙ䛜 JL
䛸 JT 䛷␗䛺䜛䛣䛸䛻⏤᮶䛩䜛䛸⪃䛘䜙䜜䜛䠊つ᱁໬☢ሙ(H/Hirr)䛻
ᑐ䛧䛶䝥䝻䝑䝖䛩䜛䛸䠈JcL 䛿 JcT 䛸ẚ㍑䛧䛶ᖖ䛻㧗䛔䠊୍᪉䛷䠈ప☢ሙୗ䛻䛚䛔䛶 JcT 䛿 JcL 䛸␗䛺䜛≉␗䛺☢ሙ౫Ꮡᛶ䜢♧䛧䛯䠊
Fig. 2 䛻 0.1 T 䛾ᖹ⾜䠈ᆶ┤☢ሙୗ䛻䛚䛡䜛 JL 䛸 JT 䛾 ᗘ౫Ꮡᛶ䜢♧䛩䠊JL䠈JT 䛔䛪䜜䜒ᖹ⾜☢ሙୗ䛾᪉䛜ᆶ┤☢ሙୗ䜘䜚䜒 Jc 䛜㧗䛟䠈Jc 䛿ప 䛷 107 A/cm2 ௨ୖ䛻㐩䛩䜛䠊୍᪉䠈JL 䛸 JT
䜢ẚ㍑䛩䜛䛸䠈JcL 䛿 ᗘ䠈☢ሙ᪉ྥ䛻㛵䜟䜙䛪ᖖ䛻 JcT 䜘䜚䜒㧗

(a)
107

Jc under 0.1 T (10 A/cm )2. ᐇ㦂᪉ἲ
HPCVD(Hybrid Physical-Chemical Vapor Deposition)ἲ࡟ࡼ
ࡾ MgO(211)ᇶᯈୖ࡟ c ㍈ࡀ 19 ᗘഴ࠸ࡓ࢚ࣆࢱ࢟ࢩࣕࣝ
MgB2 ⷧ⭷(⭷ཌ 100 nm)ࢆస〇ࡋࡓ㸬ࡇࡢⷧ⭷ࢆ࣐࢖ࢡࣟࣈ
ࣜࢵࢪᙧ≧࡟ຍᕤࡋ㸪PPMS ࢆ⏝࠸࡚ 16 T 䜎䛷䛾☢ሙୗ䛷䛾㟁ὶ-㟁ᅽ≉ᛶ䜢䝟䝹䝇㏻㟁䛻䜘䜛ᅄ➃Ꮚἲ䛷 ᐃ䛧䛯䠊⮫⏺
㟁ὶ Ic 䛾㟁⏺ᇶ‽䛸䛧䛶䛿 1 PV/cm 䜢⏝䛔䛯䠊䜎䛯䠈☢ẼගᏛ(MO)ἲ䛻䜘䜚ⷧ⭷ヨᩱෆ䛾☢᮰ᐦᗘศᕸཬ䜃 Jc 䜢ホ౯䛧䛯䠊

108

1.5

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0

0

10

20
T (K)

30

40

Fig. 2. Temperature dependence of JcL and JcT under 0.1 T in field
perpendicular and parallel to the 100 nm MgB2 tilted film.

䛔䠊䛣䜜䜙䛿䠈 ᗘ䠈☢ሙᙉᗘ䠈☢ሙ᪉ྥ䛻䜘䜙䛪 JcL 䛿 JcT 䜘䜚䜒㧗䛔䛣䛸䜢♧䛩䛜䠈䛣䛾㉳※䛻䛴䛔䛶☢᮰䝢䞁䝙䞁䜾ᶵᵓ䠈䝬䝹䝏䝞䞁䝗ຠᯝ䛾ほⅬ䛛䜙௒ᚋ䜘䜚ヲ⣽䛺᳨ウ䜢⾜䛖ணᐃ䛷䛒䜛䠊

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MgB2 (1)㻵㼚㻙㼟㼕㼠㼡㻌㻹㼓㻮㻞 䝞䝹䜽䜢௓䛧䛯 㻹㼓㻮㻞 ⥺ᮦ䛾㉸㟁ᑟ᥋⥆㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㻶㼛㼕㼚㼠㼟㻌㼛㼒㻌㻹㼓㻮㻞㻌㼃㼕㼞㼑㼟㻌㼡㼟㼕㼚㼓㻌㻵㼚㻙㼟㼕㼠㼡㻌㻹㼓㻮㻞㻌㻮㼡㼘㼗㼟㻌㼂㼛㼘㼠㼍㼓㼑㻌㼇㼂㼉㻌୍ᮌ㻌 ὒኴ䠈⏣୰㻌 ࿴ⱥ䠈࿴ஂ⏣㻌 Ẏ䠄᪥❧䠅㻌㻵㻯㻴㻵㻷㻵㻌㼅㼛㼠㼍䠈㻌 㼀㻭㻺㻭㻷㻭㻌㻷㼍㼦㼡㼔㼕㼐㼑㻘㻌㼃㻭㻷㼁㻰㻭㻌㼀㼟㼡㼥㼛㼟㼔㼕㻌㻔㻴㼕㼠㼍㼏㼔㼕㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼥㼛㼠㼍㻚㼕㼏㼔㼕㼗㼕㻚㼞㼖㻬㼔㼕㼠㼍㼏㼔㼕㻚㼏㼛㼙㻌㻌㠃䜢ほᐹ䛧䛯䛸䛣䜝䠈䛔䛪䜜䜒⥺ᮦ➃㒊࿘ᅖ䛾䝞䝹䜽ᐦᗘ䛜㻝䠊䛿䛨䜑䛻㻌
㻹㼓㻮㻞 䛿䠈ᚑ᮶䛾㔠ᒓ⣔㉸㟁ᑟᮦᩱ䛻ᑐ䛧䛶㧗䛔⮫⏺
ప䛔䛣䛸䛜䜟䛛䛳䛯䚹䛭䛣䛷䠈⥺ᮦ➃㒊䛾䝁䜰㒊㟢ฟ᪉ἲ➼䜢ᕤኵ䛧䠈䛥䜙䛻 㻹㼓㻮㻞 ྜᡂ᫬䛾య✚ῶᑡ䛻䜘䛳䛶⏕䛨䜛✵㝽ᗘ䜢᭷䛩䜛䛯䜑䠈㻝㻜㻌 㻷 ௨ୖ䠄䝦䝸䜴䝮䝣䝸䞊䠅䛷㐠㌿䛩䜛㉸㟁ᑟ䝬䜾䝛䝑䝖䛾ᐇ⌧䛜ྍ⬟䛷䛒䜛䚹≉䛻 㻹㻾㻵 䛾䜘䛖䛻㧗䛔☢ሙ䜢ῶ䜙䛩䛣䛸䜢┠ⓗ䛸䛧䛶䠈䝞䝹䜽䜢ຍᅽ䛧䛺䛜䜙⇕ฎ⌮䛧䛯Ᏻᐃᗘ䛜せồ䛥䜜䜛䝬䜾䝛䝑䝖䜈䛾ᛂ⏝䛜ᮇᚅ䛥䜜䛶䛚䜚䠈䝬䝃䞁䝥䝹䜢స〇䛧䛯䠄⇕ฎ⌮ ᗘ䠖㻢㻢㻜䉝䠅䚹䛭䛾⤖ᯝ䠈ᅗ 㻟 䛻䜾䝛䝑䝖䜢Ọஂ㟁ὶ䝰䞊䝗䛷㐠㌿䛩䜛䛯䜑䛾ᢏ⾡㛤Ⓨ䛜㐍䜑♧䛩㏻䜚䠈⇕ฎ⌮᫬䛻ຍᅽ䛧䛺䛔䝃䞁䝥䝹䛷䜒 㻵㼏 䛿኱ᖜ䛻ྥ䜙䜜䛶䛔䜛㼇㻝㼉㼇㻞㼉䚹ᡃ䚻䛿䛣䜜䜎䛷䛻 㻠㻚㻞㻌㻷 䛻䛚䛔䛶䠈㻹㼓㻮㻞 〇ୖ䛧䛯䚹䜎䛯⇕ฎ⌮᫬䛾ຍᅽ䛜 㻟㻜㻌 㻹㻼㼍 䛾䝃䞁䝥䝹䛷䛿 㻵㼏 䛾䝁䜲䝹䛚䜘䜃 㻹㼓㻮㻞 〇Ọஂ㟁ὶ䝇䜲䝑䝏䜢ྵ䜐ᅇ㊰䛾Ọஂ㟁ᨵၿຠᯝ䛜ぢ䜙䜜䛺䛛䛳䛯䛜䠈㻝㻞㻜㻌 㻹㻼㼍 䛷䛿䝁䜰ᐦᗘ䛜ୖ᪼䛧䠈㻵㼏 䛜⣙ 㻞 ಸ䛻ྥୖ䛧䛯䚹㻌ὶ㐠㌿䜢ᐇド䛧䛯㼇㻟㼉㼇㻠㼉䚹䛯䛰䛧䠈㉸㟁ᑟ᥋⥆䛻䛿㉸㟁ᑟ䛿䜣䛰䜢⏝䛔䛶䛚䜚䠈㻝㻜㻌 㻷 ௨ୖ䛾㐠㌿䛻䛿ᮍᑐᛂ䛷䛒䜛䚹ᮏሗ㻌䛷䛿䠈㻹㼓 䛸 㻮 䛾ΰྜ⢊ᮎ䜢ຍᅽ䞉↝⤖䛧䛯䝞䝹䜽䜢௓䛧䛯㻹㼓㻮㻞 ⥺ᮦ䛾㉸㟁ᑟ᥋⥆䜢ヨస䛧䠈䛭䛾⮫⏺㟁ὶ≉ᛶ䜢ホ౯㻢㻜㻜䉝 㻢㻟㻜䉝
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㻞䠊ᐇ㦂᪉ἲ㻌᥋⥆䝃䞁䝥䝹స〇᪉ἲ䛾ᴫ␎䜢ᅗ 㻝 䛻♧䛩䚹᥋⥆䛩䜛⥺㻜㻚㻜㻜㻢ᮦ䛻䛿䠈㻼㼛㼣㼐㼑㼞㻙㻵㼚㻙㼀㼡㼎㼑 ἲ䛷స〇䛧䛯እᚄ䃥㻜㻚㻣㻌 㼙㼙 䛾㻯㼡㻛㻲㼑 䝅䞊䝇༢ⰺ⥺䜢⏝䛔䛯䚹䛺䛚⥺ᮦ䛻඘ሸ䛧䛯⢊ᮎ䛿㻜㻚㻜㻜㻠㻹㼓 䛸 㻮 䜢䝪䞊䝹䝭䝹ΰྜ䛧䛯⢊ᮎ䛷䛒䜚䠈᥋⥆๓䛿ᮍ⇕ฎ⌮䛾≧ែ䛷䛒䜛䚹⥺ᮦ➃㒊䛾䝁䜰㒊䜢㟢ฟ䛥䛫䠈㻿㼁㻿 〇䜹䝥䝉㻜㻚㻜㻜㻞䝹䛻ᤄධ䛧䛯ᚋ䠈㻹㼓 䛸 㻮 䛾ΰྜ⢊ᮎ䜢䜹䝥䝉䝹䛻඘ሸ䛧䛶䝢㻜㻚㻜㻜㻜䞁䜢ᤄ䛧㎸䜏䠈䝥䝺䝇ᶵ䛷ຍᅽ䛧䛯䚹㻭㼞 㞺ᅖẼ୰䛷 㻢㻜㻜䡚
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㻣㻢㻜䉝䛻䛶 㻝 ᫬㛫⇕ฎ⌮䛧䠈㻹㼓 䛸 㻮 䜢཯ᛂ䛥䛫䠈㻹㼓㻮㻞 䜢ྜᡂ㻯㼡㼞㼞㼑㼚㼠㻌㼇㻭㼉䛧䛯䚹స〇䛧䛯᥋⥆䝃䞁䝥䝹䛾⥺ᮦ㒊ศ䛻㟁ᅽ➃Ꮚ䜢ྲྀ௜䛡䠈ᅄ➃Ꮚἲ䛻䜘䜚⮫⏺㟁ὶ䠄㻵㼏䠅䜢 ᐃ䛧䛯䚹㻵㼏 䛿 㻝䃛㼂 䛾㟁㻲㼕㼓㻚㻌㻞㻌 㻌 㻵㻌㻙㼂㻌㼏㼡㼞㼢㼑㼟㻌㼛㼒㻌㻹㼓㻮㻞㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼖㼛㼕㼚㼠㼟㻌㼍㼠㻌㻠㻚㻞㻌㻷㻌ᅽ䛜Ⓨ⏕䛧䛯㟁ὶ್䛸䛩䜛䚹䜎䛯 ᐃ䛿ᾮయ䝦䝸䜴䝮୰㻔㻠㻚㻞㻌㼕㼚㻌㼟㼑㼘㼒㻙㼒㼕㼑㼘㼐㻚㻌㻷㻕䛷⾜䛳䛯䚹㻌㻌㻡㻜㻜㻢㻢㻜䉝㻌㼡㼚㼐㼑㼞㻌㻝㻞㻜㻌㻹㻼㼍㻵 㼏 㻌㼇㻭㼉

㻠㻜㻜㻹㼓㻌㻗㻌㻮
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㻲㼕㼓㻚㻌㻝㻌 㻌 㻲㼍㼎㼞㼕㼏㼍㼠㼕㼛㼚㻌㼜㼞㼛㼏㼑㼐㼡㼞㼑㻌㼛㼒㻌㻹㼓㻮㻞㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼖㼛㼕㼚㼠㻚㻌㻌㻌㻟䠊ᐇ㦂⤖ᯝ㻌ᅗ 㻞 䛻እ㒊☢ሙ䝊䝻䛾䛸䛝䛾㟁ὶ㻙㟁ᅽ≉ᛶ䜢♧䛩䚹䛔䛪䜜䛾䝃䞁䝥䝹䜒 㻵㼏 䛿ᩘ 㻭 䛷䛒䛳䛯䚹䛯䛰䛧䠈⇕ฎ⌮ ᗘ䛜㻣㻝㻜䉝䠈㻣㻢㻜䉝䛾䝃䞁䝥䝹䛻䛴䛔䛶䛿䠈㟁ᅽ䛜Ⓨ⏕䛧ጞ䜑䛯ᚋ䜒䛧䜀䜙䛟䛿ᚤᑠ䛺᢬ᢠ䛷㟁ὶ䛜ὶ䜜䛶䛚䜚䠈䛭䜜䛮䜜 㻠㻜㻌 㻭䠈㻣㻜㻌㻭 ௜㏆䛷኱䛝䛺᢬ᢠ䛜Ⓨ⏕䛧䛯䚹䛭䛾ᚤᑠ䛺᢬ᢠ䛿⣙ 㻝㻚㻜㽢㻝㻜㻙㻠㻌 䃈䛷䛒䜚䠈㟁ὶ䛜䝅䞊䝇䜢௓䛧䛶ὶ䜜䛯䛣䛸䛻䜘䜛䝅䞊䝇䛾᢬ᢠ䛜⌧䜜䛶䛔䜛䛸⪃䛘䜙䜜䜛䚹䛴䜎䜚䠈㻵㼏 䛸䛧䛶 ᐃ䛥䜜䛯್䛿䠈⥺ᮦ䝁䜰㒊䛸䝞䝹䜽䛾⏺㠃䛾 㻵㼏 䛷䛒䜚䠈኱䛝䛺᢬ᢠ䛜Ⓨ⏕䛧ጞ䜑䜛㟁ὶ್䛜䝞䝹䜽䛾 㻵㼏 䛷䛒䜛䚹䛧䛯䛜䛳䛶䠈⥺ᮦ➃㒊䛾᩿㠃✚䜢ᣑ኱䛧䠈⥺ᮦ䝁䜰㒊䛸䝞䝹䜽䛾᥋ゐ㠃✚䜢༑ศ䛻☜ಖ䛩䜛䛣䛸䛜 㻵㼏 ྥୖ䛻᭷ຠ䛷䛒䜛䚹䜎䛯ྛ䝃䞁䝥䝹䛾᩿

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第83回

2010年度秋季低温工学・超電導学会

1D-a06

MgB2 (1)඲㉸㟁ᑟ䝰䞊䝍䛻䛚䛡䜛ᅛᐃᏊᕳ⥺⏝䛾ప஺ὶᦆኻ 㻹㼓㻮㻞 ⥺ᮦ䛾ᥦ᱌㻌Proposal of MgB2 wire with low AC loss for stator winding in fully superconducting motor㻌ஂᐙ㻌 ᗈႹ䠈ᑿᆏ㻌 ுኴ䠈᯳ᕝ㻌 ୍ᘯ䠄஑ᕞ኱Ꮫ䠅䠗୰ᮧ㻌 Ṋᜏ䠄ி㒔኱Ꮫ䠅䠗࿴ஂ⏣㻌 Ẏ䠄᪥❧〇సᡤ䠅㻌
KUGA Hirotsugu䠈OSAKA Ryota䠈KAJIKAWA Kazuhiro (Kyushu Univ.);
NAKAMURA Taketsune (Kyoto Univ.); WAKUDA Tsuyoshi (Hitachi)
E-mail: kuga@sc.kyushu-u.ac.jpゎᯒ⤖ᯝ䛾౛䛸䛧䛶26.4 K䠈100 Hz䛻䛚䛡䜛༢఩㛗ᙜ䛯䜚䛾⥺ᮦ඲య䛾஺ὶᦆኻィ⟬⤖ᯝ䜢ẚ㍑䛧䛯䜒䛾䜢Fig.2䛻♧䛩䠊䛯䛰䛧䠈⥺ᚄ䛿0.8 mm䠈⮫⏺㟁ὶIc䛿192 A䠈n್䛿116䛷
䛒䜛䠊Fig.2䜘䜚䠈᪂ᥦ᱌䛾⥺ᮦ䛻䛚䛔䛶䠈඲య䛾㏻㟁ᦆኻ䛿䜋䛸䜣䛹㉸㟁ᑟ㒊䛾ᦆኻ䛷⾲䛥䜜䠈䛥䜙䛻ᚑ᮶ᆺ䛻ẚ䜉3ศ
䛾1⛬ᗘ䜎䛷ᑠ䛥䛟䛺䜛䛣䛸䛜ศ䛛䜛䠊㻌㻌

Fig.1 Schematic diagram of the proposed MgB2 wire.
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― 78 ―

第83回

2010年度秋季低温工学・超電導学会

1D-a07

MgB2 (1)⤯⦕䛒䜚 㻹㼓㻮㻞 ୪ิᑟయ䛷ᕳ䛝⥺䛧䛯䝁䜲䝹䛾㛤Ⓨ䠎㻙஺ὶᦆኻ≉ᛶ䇷㻌
Development of an MgB2 Coil wound with a parallel conductor composed of tapes with insulation 2- AC loss properties 㻌ᩥ ኴಇ䠈ྜྷ␃㻌 భ௓㻘㻌 ᯇᓥ㻌 ೺௓㻘㻌 ᕝ㉺㻌 ᫂ྐ㻘㻌 ᕝ⏿㻌 ⛅㤿㻘㻌 ఫྜྷ㻌 ᩥኵ䠄㮵ඣᓥ኱Ꮫ䠅㻧㻌ᰗ㻌 㛗㛛㻘㻌 ୕ᡞ㻌 ฼⾜䠄᰾⼥ྜ◊䠅䠗㻌 㻌 ᮌෆ㻌 ຾㻘㻌 㻌 ᑠ⏣㒊㻌 Ⲯྖ㻘㻌 㻌 ᯇୗ㻌 ↷⏨㻔஑ᕤ኱㻕㻘㻌 ⏣୰㻌 ࿴ⱥ㻘㻌 ࿴ஂ⏣㻌 Ẏ䠄᪥❧䠅㻧㻌
MOON Taejun䠈YOSHIDOME Yusuke, MATSUSHIMA Kensuke, KAWAGOE Akifumi, KAWABATA Shuma,
SUMIYOSHI Fumio(Kagoshima University); YANAGI Nagato, MITO Toshiyuki(NIFS); KIUCHI Masaru, OTABE Edmund Soji,
MASTUSITA Teruo (Kyushu Institute of Technology); TANAKA Kazuhide, WAKUDA Tsuyoshi(HITACHI)
E-mail: k9810801@kadai.jp㻌 㻌㻌ᕳ⥺ෆ䛾☢⏺䛾஘䜜䛺䛹䛜ᙳ㡪䛧䛶䛔䜛䛸⪃䛘䜙䜜䜛䚹௒ᚋ䚸㻝䠊䛿䛨䜑䛻㻌
▷ᑻ䝃䞁䝥䝹䛾஺ὶᦆኻ䜢ᐇ 䛧䚸䛣䜜䜙䛾ᙳ㡪䜢ㄪ䜉䜛䚹
ᡃ䚻䛿䚸MgB2 ⥺ᮦ䛾㧗ᛶ⬟໬䛾䛯䜑䛻䚸୸⥺䛷䛿䛺䛟ᅽᘏ䛧䛯䝔䞊䝥⥺䜢౑⏝䛩䜛䛣䛸䜢ᥦ᱌䛧䛶䛚䜚䚸ᐇ㝿䛻⮫⏺㟁㻡䠊䜎䛸䜑㻌
ὶᐦᗘ䛾ྥୖ䜔஺ὶᦆኻ䛾పῶ䛜ᚓ䜙䜜䜛䛣䛸䜢♧䛧䛶䛔䜛⤯⦕䛒䜚 MgB2 ୪ิᑟయ䛷ᕳ⥺䛧䛯䝁䜲䝹䛾஺ὶᦆኻ ᐃ[1]䚹䛥䜙䛻䚸䛣䛾䝔䞊䝥⥺䜢᮰䛽䛯኱ᐜ㔞ᑟయ㛤Ⓨ䛾䛯䜑䛻䚸䜢⾜䛳䛯䚹䛭䛾⤖ᯝ䚸䝠䝇䝔䝸䝅䝇ᦆኻ䛜ᨭ㓄ⓗ䛷䛒䜚䚸ప㟁
2 ᮏ䛾䝔䞊䝥⥺䛷ᵓᡂ䛥䜜䜛୪ิᑟయ䛻䜘䜛䝁䜲䝹䜢㛤Ⓨ䛧䚸ὶ㡿ᇦ䛷䛿 Cu 䛾 㟁ὶᦆኻ䜒ほ 䛥䜜䛯䚹䛧䛛䛧䛺䛜䜙䝠䝇䛭䛾ヨ㦂䜢⾜䛳䛶䛔䜛䚹䛣䛾䝔䞊䝥⥺䛿䚸᩿㠃䜰䝇䝨䜽䝖ẚ䛜䝔䝸䝅䝇ᦆኻ䛾⌮ㄽ್䛸䛾஋㞳䛜ほ 䛥䜜䛯䛾䛷䚸▷ᑻ䝃䞁
2 䛾༢ⰺ⥺䛷䛒䜚䚸2 ᮏ䛾䝔䞊䝥㛫䛿⤯⦕䛧䛶䛔䜛䚹䛣䜜䜎䛷䝥䝹䛾஺ὶᦆኻ䜢⾜䛔䚸䛭䛾䝕䞊䝍䜢ᇶ䛻䚸ᮏ䝁䜲䝹䛾஺ὶ䛻ᮏ䝁䜲䝹䛜タィ್㏻䜚䛾⮫⏺㟁ὶ䜎䛷Ᏻᐃ䛧䛶㏻㟁䛷䛝䛯ᦆኻ≉ᛶ䜢ᐃ㔞ⓗ䛻᫂䜙䛛䛻䛩䜛䚹䛣䛸䜢♧䛧䛯[2]䚹௒ᅇ䛿䚸஺ὶ㏻㟁᫬䛾≉ᛶホ౯䜢⾜䛖䛯䜑䛻䚸஺ὶᦆኻ䛾 ᐃ䜢⾜䛳䛯䚹ཧ⪃ᩥ⊩
1. K. Matsushima, et al.: Abstracts of Conference, Vol 81㻞䠊䝁䜲䝹ᵓ㐀㻌(2009) p.216.
ᮏ䝁䜲䝹䛿䚸Fig. 1 䛻♧䛩䜘䛖䛻䚸2 ᮏ䛾⤯⦕䛥䜜䛯䝔䞊䝥
2. Y. Yoshidome, et al.: Abstracts of Conference, Vol 82⥺䛷ᵓᡂ䛥䜜䛯୪ิᑟయ䛷ᕳ⥺䛥䜜䛶䛔䛶䚸2 䛴䛾䝁䜲䝹䜢(2010) p.71.
ྠ㍈䛻㓄⨨䛧┤ิ᥋⥆䛧䛯䜒䛾䛷䛒䜛䚹䝔䞊䝥⥺㛫䛷㟁ὶศᕸ䛜ᆒ୍䛻䛺䜛䜘䛖䛻䚸䝁䜲䝹㛫䛾᥋⥆㒊䛷 2 ᮏ䛾䝔䞊䝥⥺䛻㌿఩䜢᪋䛧䛶䛔䜛䚹䝁䜲䝹䛾䝍䞊䞁ᩘ䛿䚸඲య䛷 540 䝍䞊䞁䛷䛒䜚䚸䜲䞁䝎䜽䝍䞁䝇䛿 16.4mH 䛷䛒䛳䛯䚹౑⏝䛧䛯䝔䞊䝥⥺ᮦ䛿䚸MgB2/Nb/Cu 䛷ᵓᡂ䛥䜜䛯༢ⰺ⥺䛷䚸⥺ᮦእᙧ䛾᩿㠃ᑍἲ䛿䚸1.05mm㽢0.504mm 䛸䜰䝇䝨䜽䝖ẚ䛿 2 䛷䛒䜛䚹
MgB2 䝣䜱䝷䝯䞁䝖㒊䛿䚸0.71mm㽢0.23mm 䛸䛺䛳䛶䛚䜚䚸᩿㠃䜰䝇䝨䜽䝖ẚ䛿 3.1 䛷䛒䜛䚹䝁䜲䝹䛾⇕ฎ⌮䛿䚸䝇䝔䞁䝺䝇〇䛾䝪䝡䞁䛻ᕳ⥺䜢⾜䛳䛯ᚋ䛻⾜䛳䛯䚹⇕ฎ⌮ᚋ䛻䚸䝇䝔䞁䝺䝇〇䛾䝪䝡䞁䛛䜙䝁䜲䝹䜢ྲྀ䜚እ䛧䛶 FRP 〇䛾䝪䝡䞁䛻ྲྀ䜚௜䛡䚸㏻㟁ヨ㦂䜢⾜䛳䛯䚹㻟䠊ᐇ㦂᪉ἲ㻌ᮏ䝁䜲䝹䛾஺ὶᦆኻ䜢᫂䜙䛛䛻䛩䜛䛯䜑䛻䚸஺ὶ㏻㟁䜢䛚䛣䛺䛔䚸஺ὶᦆኻ䛾 ᐃ䜢㟁Ẽⓗ䛻⾜䛺䛳䛯䚹䝁䜲䝹䛾෭༷䛿䚸ᾮయ䝦䝸䜴䝮䛾ᾐₕ෭༷䛷䛒䜛䚹ᕳ⥺䛻౑⏝䛧䛯⥺ᮦ䛻䛿䚸䝞䝸䜰ᮦ䛾 Nb 䛜౑⏝䛥䜜䛶䛔䜛䛜䚸ᐇ㝿䛾ᛂ⏝᮲௳䛷䛿 Nb 䛿ᖖఏᑟ≧ែ䛻䛒䜛䛸⪃䛘䜙䜜䜛䚹䛭䛣䛷䚸Nb 䛜㉸ఏᑟ≧ែ䛷䛒䜛䛣䛸䛻䜘䜛஺ὶᦆኻ䜈䛾ᙳ㡪䜢㑊䛡䜛䛯䜑䚸┤ὶ 100A 䜢㏻㟁䛧䚸䛭䛾┤ὶ㟁ὶ䛻஺ὶ㟁ὶ䜢㔜␚䛥䛫䛯≧ែ䛷஺ὶᦆኻ䛾 ᐃ䜢⾜䛳䛯䚹100A㏻㟁᫬䛻䛿䚸ᕳ⥺㒊䛾኱㒊ศ䛜 0.3T 䜢㉸䛘䜛☢ሙ䛜༳ຍ䛥䜜䜛䚹஺ὶ㟁ὶ䛿䚸1~14Ar.m.s䚸࿘Ἴᩘ 1~20Hz 䛸䛧䛯䚹㻠䠊⤖ᯝ䛚䜘䜃᳨ウ㻌ᐃ⤖ᯝ䜢 Fig. 2 䛻♧䛩䚹஺ὶ㟁ὶ 1 䝃䜲䜽䝹ᙜ䛯䜚䛾஺ὶᦆኻ䜢⦪㍈䛻䛸䜚䚸஺ὶ㟁ὶ䛾ᐇຠ್䜢ᶓ㍈䛻䛸䛳䛶䛔䜛䚹
2Arms ௨ୖ䛷䛿䜋䛸䜣䛹࿘Ἴᩘ౫Ꮡᛶ䛿ほ 䛥䜜䛶䛚䜙䛪䚸䝠䝇䝔䝸䝅䝇ᦆኻ䛜ᨭ㓄ⓗ䛷䛒䜛䛸⪃䛘䜙䜜䜛䚹䜎䛯 1Arms 䛾᫬䛻࿘Ἴᩘ౫Ꮡᛶ䛜ほ 䛥䜜䛶䛔䜛䚹࿘Ἴᩘ䛻౫Ꮡ䛧䛺䛔ᡂศ䜢ồ䜑䜛䛸䚸䛣䛾ᡂศ䛿㟁ὶ䛾 2.3 ஌䛻ẚ౛䛧䛶䛔䛯䚹࿘Ἴᩘ䛻ẚ౛䛩䜛ᡂศ䛿䚸Ᏻᐃ໬ᮦ䛾 Cu 䛾 㟁ὶᦆኻ䛷䛒䜛䛸⪃䛘䜙䜜䜛䚹
䝠䝇䝔䝸䝅䝇ᦆኻ䜢⌮ㄽⓗ䛻ィ⟬䛩䜛䛸䚸㟁ὶ䛾⣙ 3 ஌䛻ẚ౛䛩䜛䚹 ᐃ್䛾㟁ὶ౫Ꮡᛶ䛾ഴ䛝䛿䛣䜜䜘䜚䜒ᑠ䛥䛔䚹䛣䛾䛣䛸䛿䚸MgB2 䝣䜱䝷䝯䞁䝖䛾᩿㠃ᙧ≧䛾พฝ䛺䛹䛻䜘䜛ᙳ㡪䜔䚸― 79 ―

Fig.1 MgB2 coil wound with a parallel conductor composedof tapes with insulation conductor composed of tapes withinsulation

Fig.2 AC losses in MgB2 coil
第83回

2010年度秋季低温工学・超電導学会

1D-a08

Nb3Al 線材

⢊ᮎ䝏䝳䠉䝤ἲ⥺ᮦ䜢㐃⥆ᛴ⇕ᛴ෭ฎ⌮䛧䛶స〇䛧䛯ྛ✀ 㻭㻝㻡 ᆺ⥺ᮦ㻌䛾㉸㟁ᑟ≉ᛶ㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㻼㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼛㼒㻌㻿㼑㼢㼑㼞㼍㼘㻌㻭㻙㻝㻡㻌㻯㼛㼚㼐㼡㼏㼠㼛㼞㼟㻌㻲㼍㼎㼞㼕㼏㼍㼠㼑㼐㻌㼠㼔㼞㼛㼡㼓㼔㻌㻌 㻼㻵㼀㻌㻼㼞㼛㼏㼑㼟㼟㻌㼍㼚㼐㻌㻾㻴㻽㻌㼀㼞㼑㼍㼠㼙㼑㼚㼠㻌஭ୖ㻌 ᗮ䚸క㔝㻌 ಙဢ䚸➉ෆ㻌 Ꮥኵ䚸㣤ᓥᏳ⏨䚸℧ᕝ㻌 ᘯᖾ䠄≀ᮦᶵᵓ䠅㻌㻵㻺㻻㼁㻱㻌㻷㼕㼥㼛㼟㼔㼕䠈㻌 㻮㻭㻺㻺㻻㻌㻺㼛㼎㼡㼥㼍㻘㻌㼀㻭㻷㻱㼁㻯㻴㻵㻌㼀㼍㼗㼍㼛㻘㻌㻵㻵㻶㻵㻹㻭㻌㼅㼍㼟㼡㼛㻘㻌㼀㻭㻷㻵㻳㻭㼃㻭㻌㻔㻺㻵㻹㻿㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㻵㻺㻻㼁㻱㻚㻷㼕㼥㼛㼟㼔㼕㻬㼚㼕㼙㼟㻚㼓㼛㻚㼖㼜㻌㻞䠊ヨᩱ〇㐀ἲཬ䜃≉ᛶ ᐃἲ㻌እᚄ 㻞㻜㻌 㼙㼙䚸ෆᚄ 㻤㻌 㼙㼙䚸㛗䛥 㻢㻜㻌 㼙㼙 䛾 㼀㼍 䛾䝟䜲䝥䛻䚹㼂㻟㻳㼍䚸㻺㼎㻟㻭㼘䚸㻺㼎㻟㻳㼍 ཬ䜃㻌 㻺㼎㻟㻳㼑 䛾⢊ᮎ䜢ワ䜑㎸䜏䚸⁁䝻䞊䝹ຍᕤ䚸䜹䝉䝑䝖䝻䞊䝷䞊䝎䜲䝇ຍᕤ䛻䜘䜚䚸㻜㻚㻤㻞㻌 㼙㼙䃅䛾㛗ᑻ⥺ᮦ䛻ຍᕤ䛧䛯䚹䛣䛾⥺ᮦ䜢 㻾㻴㻽 ⿦⨨䛻䝉䝑䝖䛧䚸⛣ື㏿ᗘ㻜㻚㻠㻌 㼙㻛㼟㼑㼏䚸㏻㟁ຍ⇕㛗䛥㻌 㻟㻜㻌 㼙 䛷 㻾㻴㻽 ฎ⌮䜢⾜䛳䛯䚹㏻㟁㟁ᅽ䛿ᚎ䚻䛻ቑຍ䛥䛫䚸฿㐩 ᗘ䜢ቑຍ䛥䛫䛯䚹䜎䛯䚸ྠ୍᮲௳䛷 㻢㻜㻜㻌㼙㼙 䛾䝃䞁䝥䝹䛜ྲྀ䜜䜛䜘䛖㏻㟁᮲௳䜢ไᚚ䛧䛯䚹㻌㻾㻴㻽 ฎ⌮ᚋ䚸⥺ᮦ⾲㠃䛛䜙㟁ᴟཬ䜃෭፹䛸䛧䛶౑⏝䛧䛯㻳㼍 䜢ሷ㓟䛷㝖ཤ䛧䚸㻢㻜㻜䡚㻤㻜㻜䉝䛷䚸㐣㣬࿴ᅛ⁐య䊻㻭㻝㻡 ᆺ໬ྜ≀䜈䛾ኚែ䜒䛧䛟䛿⤖ᬗ⛛ᗎᗘྥୖ䛾䛯䜑䛾⇕ฎ⌮䜢⾜䛳䛯䚹㻌䛣䜜䜙䛾ヨᩱ䛿 㻯㼡 䝯䝑䜻䜢䛧䛯ᚋ䚸᢬ᢠἲ䛷䚸⮫⏺ ᗘ 㼀㼏ཬ䜃⮫⏺㟁ὶ 㻵㼏 䜢 ᐃ䛧ホ౯䛧䛯䚹㻌㻟䠊ᐃ⤖ᯝ䛚䜘䜃⪃ᐹ㻌㻲㼕㼓㻚㻌 㻝 䛻 㼂㻟㻳㼍 ⥺ᮦ䛷ᚓ䜙䜜䛯 㼀㼏 ್䛾 㻾㻴㻽 ฎ⌮᫬䛾᭱㧗฿㐩 ᗘ䠄㻭㼠㼠㼍㼕㼚㼍㼎㼘㼑㻌 㼀㼑㼙㼜㼑㼞㼍㼠㼡㼞㼑䠅౫Ꮡᛶ䜢♧䛧䛯䚹䛺䛚䚸᭱㧗฿㐩 ᗘ䛿 㻾㻴㻽 ฎ⌮᫬䛻⥺ᮦ䛻ຍ䛘䜙䜜䛯㟁ຊ䛜඲䛶 ᗘୖ᪼䛻౑䜟䜜䛯䛸௬ᐃ䛧䛶ィ⟬䛧䛯䜒䛾䛷䚸䜸䞊䝞䞊䛺ぢ✚䜒䜚䛸䛺䛳䛶䛔䜛䛷䛒䜝䛖䚹㻌㻾㻴㻽 ฎ⌮䛧䛯䜎䜎䛾 㼂㻟㻳㼍 ⥺ᮦ䛿฿㐩 ᗘ 㻝㻤㻜㻜䉝௨ୗ䛷䛿 㻭㻝㻡 ᆺ໬ྜ≀┦䛜ⱝᖸṧ䛳䛶䛔䜛䛜䚸㻝㻤㻜㻜䉝௨ୖ䛸䛺䜛䛸඲䛶䚸㐣㣬࿴ᅛ⁐య䠄㼀㼏 䛿 㻠㻌 㻷 ௨ୗ䠅䛻ኚ໬䛩䜛䛯䜑䚸⥺ᮦእቨ䛾 㼀㼍 䛾 㼀㼏 䜢♧䛩䚹䛥䜙䛻 㻢㻡㻜䉝䛷㏣ຍ⇕ฎ⌮䛩䜛䛸㐣㣬࿴ᅛ⁐య䊻㻭㻝㻡 ᆺ໬ྜ≀䜈䛾ኚែ䛜㉳䛣䜚䚸㻝㻠㻚㻞䡚㻝㻠㻚㻤㻌㻷䛾 㼂㻟㻳㼍 䛾 㼀㼏 䜢♧䛩䜘䛖䛻䛺䜛䚹䛣䛾 㼂㻟㻳㼍 䛾ኚែ ᗘ 㻢㻡㻜䉝䛿 㻺㼎㻟㻭㼘 䛾ኚែ ᗘ 㻤㻜㻜䉝䛻ẚ䜉䛛䛺䜚ప䛔䚹㻌⢊ᮎἲ䛻䜘䜛 㻺㼎㻟㻭㼘 ๓㥑య⥺ᮦ䜢౑䛳䛯ሙྜ䛷䜒㢮ఝ䛧䛯㐣㣬࿴ᅛ⁐య䛾⏕ᡂ䛸㐣㣬࿴ᅛ⁐య䊻㻭㻝㻡 ᆺ໬ྜ≀䜈䛾ኚែ䛜ほᐹ䛥䜜䛯䚹㻌ኚែ⇕ฎ⌮ᚋ䛾 㼂㻟㻳㼍 ⥺ᮦཬ䜃 㻺㼎㻟㻭㼘 ⥺ᮦ䛾 㻵㼏 䛾☢⏺౫Ꮡᛶ䜢 㻲㼕㼓㻚㻌㻞㻌 䛻䛧䜑䛧䛯䚹ṧᛕ䛺䛜䜙 㻵㼏 ್䛿ᚑ᮶䛾 㻺㼎㻟㻭㼘 ⥺― 80 ―

CriƟcal Temperature (K)ᮦ䛾䝆䜵䝸䞊䝻䞊䝹ἲ๓㥑య⥺ᮦ䜢౑䛳䛯ሙྜ䛻ẚ䜉䜛䛸䛛䛺䜚ప䛔䛜䚸๓㥑య〇㐀ἲ䛜ᅽಽⓗ䛻⡆༢䚸ప䝁䝇䝖䛻䛺䜛䛣䛸䜢⪃䛘䜛䛸䚸䜘䜚ヲ⣽䛺᳨ウ䛜ᮃ䜎䜜䜛䚹㻌䛺䛚䚸☢⏺ቑຍ䛻䜘䜛 㻵㼏 ῶᑡ⋡䛿 㼂㻟㻳㼍 ⥺ᮦ䛾᪉䛜䛪䛳䛸ᑠ䛥䛟䚸㐣ཤ䛻ᣑᩓἲ⥺ᮦ䛷ᚓ䜙䜜䛯ഴྥ䛸୍⮴䛧䛶䛔䜛䚹㻌㻺㼎㻟㻳㼍 䛸 㻺㼎㻟㻳㼑 ๓㥑య⥺ᮦ䜢౑䛳䛯ሙྜ䛻ᚓ䜙䜜䛯㉸㟁ᑟ≉ᛶ䛻䛴䛔䛶䜒ሗ࿌䛩䜛ணᐃ䛷䛒䜛䚹㻌

650oC for 20h

As quenchedAƩainable Temperature (oC)㻲㼕㼓㻚㻝㻌 㻌 㼀㼏㻌㼢㼟㻚㻌㼍㼠㼠㼍㼕㼚㼍㼎㼘㼑㻌㼠㼑㼙㼜㼑㼞㼍㼠㼡㼞㼑㻌㼒㼛㼞㻌㼂㻟㻳㼍㻌㼣㼕㼞㼑㼟㻚㻌

100

Critical Current (A)㻝䠊䛿䛨䜑䛻㻌
㐃⥆ᛴ⇕ᛴ෭ฎ⌮䠄㻾㻴㻽䠅⿦⨨䛿㻌 㻺㼎㻟㻭㼘 ⥺ᮦ䛾⇕ฎ⌮᪉ἲ䛸䛧䛶㛤Ⓨ䛥䜜䛯⿦⨨䛷䚸㧗 ▷᫬㛫⇕ฎ⌮䛸ᛴ෭䜢㐃⥆ⓗ䛻⾜䛖䛣䛸䛜䛷䛝䚸㻺㼎㻟㻭㼘 䛾㐣㣬࿴ᅛ⁐య䜢స䜛䛣䛸䛷䚸໬Ꮫ㔞ㄽ⤌ᡂ䛻㏆䛔ඃ䜜䛯㉸㟁ᑟ≉ᛶ䜢ᚓ䜛䛣䛸䛜䛷䛝䜛஦䛜▱䜙䜜䛶䛔䜛䚹䛣䛾⿦⨨䜢௚䛾 㻭㻝㻡 ᆺ໬ྜ≀䛻㐺⏝䛧䛯䜙䛹䛾䜘䛖䛺⥺ᮦ䛜ᚓ䜙䜜䜛䛛䜢᳨ウ䛧䛶䜏䛯䚹㻾㻴㻽 ⿦⨨䛻䛛䛡䜛๓㥑య⥺ᮦ䛸䛧䛶䛿 㼀㼍 ⟶䛻ྛ✀ 㻭㻝㻡 ໬ྜ≀⢊ᮎ䜢ワ䜑㎸䜣䛰䜒䛾䜢౑⏝䛧䛯䚹⢊ᮎἲ䛿ྛ✀ 㻭㻝㻡 ᆺ໬ྜ≀䛾⥺ᮦ໬䛻㐺⏝䛜⡆༢䛷䛒䜛䛛䜙䛷䛒䜛䚹䜎䛪䚸㼂㻟㻳㼍 䛸 㻺㼎㻟㻭㼘 䛾⥺ᮦ໬䜢ヨ䜏䛯䚹䛣䛾 㻞 ✀㢮䛾໬ྜ≀䛿㧗 䛛䜙ᛴ෭䛩䜛䛸㐣㣬࿴ᅛ⁐య䛜䛷䛝䜛䛣䛸䛜▱䜙䜜䛶䛔䜛䚹䛺䛚䚸⢊ᮎἲ 㻺㼎㻟㻭㼘 䜢౑䛳䛯 㻾㻴㻽 ฎ⌮䛾◊✲䛿ึ䜑䛶䛷䛒䜛䚹㻌䛴䛔䛷䚸㻺㼎㻟㻳㼍 䛸 㻺㼎㻟㻳㼑 䛾⥺ᮦ໬䜒ヨ䜏䛯䚹㻺㼎㻟㻳㼍 䛸㻌㻺㼎㻟㻳㼑 䛿㧗 䛛䜙ᛴ෭䛩䜛䛸䚸㻞㻜㻌㻷 䜢㉺䛩㧗䛔 㼀㼏 䜢♧䛩䛣䛸䛜▱䜙䜜䛶䛔䜛䚹㧗 䛛䜙䛾ᛴ෭ୗ䛷䛾䜏໬Ꮫ㔞ㄽ⤌ᡂ䛻㏆䛔໬ྜ≀䛜⏕ᡂ䛩䜛䛛䜙䛷䛒䜛䚹㻌

Nb3Al wire
10

V3Ga wire

1

4.2 K
0.1
0

5

10

15

20

Magnetic Field (T)㻲㼕㼓㻚㻌㻞㻌 㻌 㻵㼏㻌㼢㼟㻚㻌㻮㻌㼏㼡㼞㼢㼑㼟㻌㼒㼛㼞㻌㻺㼎㻟㻭㼘㻌㼍㼚㼐㻌㼂㻟㻳㼍㻌㼣㼕㼞㼑㼟㻚㻌

第83回

2010年度秋季低温工学・超電導学会

1D-a09

Nb3Al 線材

ᨵⰋ䛧䛯䝞䝸䜰ᆺ 㻯㼡 ෆ㒊Ᏻᐃ໬䞉ᛴ⇕ᛴ෭ኚែἲ 㻺㼎㻟㻭㼘 ⥺ᮦ㻌㻹㼛㼐㼕㼒㼕㼑㼐㻌㼎㼍㼞㼞㼕㼑㼞㻙㼠㼥㼜㼑㻌㻯㼡㻌㼕㼚㼠㼑㼞㼚㼍㼘㼘㼥㻌㼟㼠㼍㼎㼕㼘㼕㼦㼑㼐㻌㻾㻴㻽㼀㻌㻺㼎㻟㻭㼘㻌㼣㼕㼞㼑㼟㻌

Magnetization (x1000 kA/m)㻌➉ෆ㻌 Ꮥኵ㻘㻌 ஧᳃㻌 ⱱᶞ㻘㻌 ℧ᕝ㻌 ༤ᖾ㻘㻌 క㔝㻌 ಙဢ㻘㻌 㣤ᔱ㻌 Ᏻ⏨㻘㻌 ⳥ụ㻌 ❶ᘯ䠄㻺㻵㻹㻿䠅䠗㻌ᅵᒇ㻌 Ύ⃈㻘㻌 ୰ᮏ㻌 ᘓᚿ㻌 㻔㻷㻱㻷㻕㻧୰ᕝ㻌 ࿴ᙪ䠄᪥❧㟁⥺䠅㻌㼀㻭㻷㻱㼁㻯㻴㻵㻌㼀㼍㼗㼍㼛㻘㻌㻺㻵㻹㻻㻾㻵㻌㻿㼔㼕㼓㼑㼗㼕㻘㻌㼀㻭㻷㻵㻳㻭㼃㻭㻌㻴㼕㼞㼛㼥㼡㼗㼕㻘㻌㻮㻭㻺㻺㻻㻌㻺㼛㼎㼡㼥㼍㻘㻌㻵㻵㻶㻵㻹㻭㻌㼅㼍㼟㼡㼛㻘㻌㻷㻵㻷㼁㻯㻴㻵㻌㻭㼗㼕㼔㼕㼞㼛㻌㻔㻺㻵㻹㻿㻕㻧㻌㼀㼁㻿㻯㻴㻵㼅㻭㻌㻷㼕㼥㼛㼟㼡㼙㼕㻘㻌㻺㻭㻷㻭㻹㻻㼀㻻㻌㼀㼍㼠㼟㼡㼟㼔㼕㻌㻔㻷㻱㻷㻕㻧㻌㻺㻭㻷㻭㻳㻭㼃㻭㻌㻷㼍㼦㼡㼔㼕㼗㼛㻌㻔㻴㼕㼠㼍㼏㼔㼕㻌㻯㼍㼎㼘㼑㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼀㻭㻷㻱㼁㻯㻴㻵㻚㼀㼍㼗㼍㼛㻬㼚㼕㼙㼟㻚㼓㼛㻚㼖㼜㻌㻌㻝䠊䛿䛨䜑䛻㻌
㻟㻜㻜㻭 䛾ヨᩱ䛾୍㒊䛿 㻜㻚㻟㻡㼙㼙 ཌ䛥䛾䝔䞊䝥≧䛻ᖹ䝻䞊䝹䛷ඃ䜜䛯⪏ṍ䜏≉ᛶ䛾䛯䜑᰾⼥ྜ䞉ຍ㏿ჾ➼䜈䛾฼⏝䛜ᮇᅽᘏᡂᙧᚋ䚸ኚែ⇕ฎ⌮䜢᪋䛧᭤䛢䜂䛪䜏ヨ㦂ヨᩱ䛸䛧䛯䚹ᚅ䛥䜜䜛ᛴ⇕ᛴ෭ኚែἲ 㻺㼎㻟㻭㼘 ⥺ᮦ䛾ゎỴ䛩䜉䛝ㄢ㢟䛾୍ኚែ⇕ฎ⌮䛧䛯୸⥺䠄ᅗ 㻞㻔㼎㻕䠅䛷䚸㻠㻚㻞㻷䚸㻝㻚㻤㻷 䛾୧ ᗘ䛷䝣䝷䝑䜽䝇䝆䝱䞁䝥䛜ᢚไ䛷䛝䛶䛔䜛䛣䛸䜢☜ㄆ䛧䛯䠄ᅗ 㻟䠅䚹㻌䛴䛻ప䝁䝇䝖䞉㔞⏘ᛶ䛜ᣲ䛢䜙䜜䜛䚹䝣䜱䝷䝯䞁䝖㛫䛾㟁☢Ẽⓗ㻌⤖ྜ䜢᩿䛱ษ䛳䛶ప☢⏺୙Ᏻᐃᛶ䜢ゎᾘ䛩䜛䛯䜑䛻ᑟධ䛥䜜䛯 㼀㼍 䝣䜱䝷䝯䞁䝖㛫䝞䝸䜰ᵓ㐀䛿䚸ཎᮦᩱ䝁䝇䝖䜢ᢲ䛧ୖ䛢䜛䛰䛡䛷䛺䛟䚸ከⰺ䝡䝺䝑䝖䛾ᢲ䛧ฟ䛧䞉ఙ⥺ᕤ⛬䛻䛚䛔䛶㼀㼍㻛㼀㼍 㛫䛾༑ศ䛺⏺㠃ᙉᗘ䛜ᐇ⌧䛷䛝䛶䛔䛺䛔䛣䛸䛻⏤᮶䛧䛶䚸㼀㼍 䝣䜱䝷䝯䞁䝖䝞䝸䜰㒊䜢㉳Ⅼ䛸䛧䛯᩿⥺䜢㢖Ⓨ䛥䛫㼇㻝㼉䚸䛭䛾ᚋ䛾〇㐀ᕤ⛬䜢↹㞧໬䛥䛫䛶䛔䜛䚹䜎䛯䚸ᛴ෭ᚋ䛻ู㏵
㻯㼡 Ᏻᐃ໬ᮦ䜢」ྜ䛩䜛ᚲせ䛜䛒䜛䛜䚸⌧ᅾᐇ᪋䛥䜜䛶䛔䜛䜲䜸䞁䝥䝺䞊䝔䜱䞁䜾๓ฎ⌮䛾ᚋ䛻㟁ゎ䝯䝑䜻䛩䜛᪉ἲ䛸ᛴ෭ᚋ」ྜຍᕤ䠄䝸䝇䝍䝑䜽䠅䛩䜛᪉ἲ䛿䚸୧⪅䛸䜒䛻ᨵၿ䛩䜉䛝Ⅼ䛜ከ䛔䚹㻌㻌୍᪉䚸㼀㼍 䛸 㻯㼡 䛜䡚㻝㻥㻡㻜䉝䛾㧗 䛷䜒䜋䛸䜣䛹ᅛᾮᣑᩓ཯
㻲㼕㼓㻚㻌㻝㻌㻯㼞㼛㼟㼟㻌㼟㼑㼏㼠㼕㼛㼚㼟㻌㼛㼒㻌㻔㼍㻕㻌㼠㼔㼑㻌㼏㼛㼚㼢㼑㼚㼠㼕㼛㼚㼍㼘㻌㻯㼡㻌㼕㼚㼠㼑㼞㼚㼍㼘㼘㼥㻌㼟㼠㼍㼎㼕㼘㼕㼦㼑㼐㻌ᛂ䛧䛺䛔䛣䛸䛻╔║䛧䛶䚸ከⰺ⥺୰ኸ㒊䛻 㼀㼍 ⿕そ 㻯㼡㻌 䝣䜱䝷䝯㻾㻴㻽㼀㻌㻺㼎㻟㻭㼘㻌㼣㼕㼞㼑㻌㼍㼚㼐㻌㻔㼎㻕㻌㼍㼚㻌㼑㼤㼍㼙㼜㼘㼑㻌㼛㼒㻌㼙㼛㼐㼕㼒㼕㼑㼐㻌㼐㼑㼟㼕㼓㼚㻚㻌䞁䝖䛾ᙧ䛷㞟୰㓄⨨䛥䛫䜛䛣䛸䛻䜘䜚䚸䛿䛨䜑䛛䜙Ᏻᐃ໬ᮦ䜢⥺ᮦ᩿㠃ෆ㒊䛻⤌䜏㎸䜣䛷䠄ᅗ 㻝㻔㼍㻕䠅ᛴ෭ᚋ䛾Ᏻᐃ໬ᮦ」ྜᕤ⛬䛜┬䛡䜛ప䝁䝇䝖䞉Ᏻᐃ໬ᮦ」ྜᢏ⾡䠄ෆ㒊Ᏻᐃ໬ᢏ⾡㼇㻞㼉䠅䛜㛤Ⓨ䛥䜜䛶䛔䜛䚹䜒䛧䚸䛣䛾ෆ㒊Ᏻᐃ໬ᢏ⾡䜢䝣䜱䝷䝯䞁䝖㛫䝞䝸䜰䛻䜒ᣑᙇ㐺⏝䛧 㻯㼡 䝣䜱䝷䝯䞁䝖㛫䝞䝸䜰ᵓ㐀䠄ᅗ㻝㻔㼎㻕䠅䜢ᐇ⌧䛷䛝䜛䛺䜙䜀䚸䝞䝸䜰㒊䛻䛚䛔䛶 㼀㼍㻛㼀㼍 ⏺㠃䛜䛺䛟䛺䜛㻔㼀㼍㻛㻯㼡㻛㻯㼡㻛㼀㼍 ⏺㠃䛻ኚ᭦䛩䜛㻕䛣䛸䛛䜙๓㥑య〇㐀䛻䛚䛡䜛᩿⥺䜢ᢚṆ䛷䛝䚸䜎䛯䚸ෆ㒊䛻ྵ䜐 㻯㼡 Ᏻᐃ໬ᮦ䞉య✚㻌ẚ䜢┦ᙜ⛬ᗘቑ኱䛷䛝䜛䛣䛸䛛䜙ᛴ෭ᚋ䛻ู㏵Ᏻᐃ໬ᮦ䜢」
㻲㼕㼓㻚㻌 㻞㻌 㻯㼞㼛㼟㼟㻌 㼟㼑㼏㼠㼕㼛㼚㼟㻌 㼛㼒㻌 㼙㼍㼚㼡㼒㼍㼏㼠㼡㼞㼑㼐㻌 㼙㼛㼐㼕㼒㼕㼑㼐㻌 㼎㼍㼞㼞㼕㼑㼞㻙㼠㼥㼜㼑㻌 㻯㼡㻌ྜ䛩䜛ᚲせ䜒䛺䛟䛺䜚䚸ప䝁䝇䝖໬䛜ᮇᚅ䛷䛝䜛䚹㻌㼕㼚㼠㼑㼞㼚㼍㼘㼘㼥㻌㼟㼠㼍㼎㼕㼘㼕㼦㼑㼐㻌㻾㻴㻽㼀㻌㻺㼎㻟㻭㼘㻌㼣㼕㼞㼑㼟㻚㻌㻔㼍㻕㻌㼎㼑㼒㼛㼞㼑㻌㻾㻴㻽㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚㻘㻌㻔㼎㻕㻌㼍㼒㼠㼑㼞㻌㻾㻴㻽㻌㼛㼜㼑㼞㼍㼠㼕㼛㼚㻌㻔㻵㻾㻴㻽㻩㻟㻜㻜㻌㻭㻕㻚㻌䛣䛾䜘䛖䛺ほⅬ䛛䜙䚸᫖ᖺᗘ䛿䚸㻯㼡㻛㼀㼍㻛㻔㻺㼎㻛㻭㼘㻕භゅ䝅䞁䜾䝹⥺ 㻞㻞㻞 ᮏ䛸୰ᚰ䝎䝭䞊㻯㼡㻛㼀㼍 භゅ⥺ 㻝㻥 ᮏ䜢 㼀㼍 䝅䞊䝇䛾୰
Cu fil. barrier䛻㓄⨨䛧䛯䝞䝸䜰ᆺ 㻯㼡 ෆ㒊Ᏻᐃ໬䞉๓㥑యከⰺ⥺䜢ヨస䛧
0.4
Cu fil. barrier (1.8K)
䛯㼇㻟㼉䚹ᮇᚅ䛧䛶䛔䛯䛸䛚䜚䛻↓᩿⥺䛷䛾ఙ⥺ຍᕤ䛜ྍ⬟䛻䛺
Nb fil. barrier䛳䛯䜒䛾䛾䚸ᛴ⇕ᛴ෭ฎ⌮䛩䜛䛸ྛ 㻺㼎㻛㻭㼘 䝣䜱䝷䝯䞁䝖䛾࿘䜚䛻
Ta fil. barrier
0.2㓄⨨䛧䛯⣙ 㻝㻚㻢ȝ㼙 ཌ䛥䛾 㼀㼍 ᒙ䜢㈏㏻䛧䛶䝣䜱䝷䝯䞁䝖㛫䝞䝸䜰㒊䛾 㻯㼡 䛜 㻺㼎㻛㻭㼘 䝣䜱䝷䝯䞁䝖ෆഃ䛻ᣑᩓ䛧䚸⤖ᒁ䚸㻭㼘 䛜 㻺㼎
0.0䛻㐣㣬࿴䛻ᅛ⁐䛧䛯 㼎㼏㼏 ┦䝣䜱䝷䝯䞁䝖䜢⏕ᡂ䛩䜛䛣䛸䛜䛷䛝䛺䛛䛳䛯䚹ᮏ◊✲䛷䛿 㼀㼍 ᒙ䛾ཌ䛥䜢 㻝㻚㻢ȝ㼙ĺ5ȝ㼙 䛻ཌ䛟䛧䚸ᨵⰋ䜢ヨ䜏䛯䚹㻌
-0.2
㻞䠊ᨵⰋ䛧䛯䝞䝸䜰ᆺ 㻯㼡 ෆ㒊Ᏻᐃ໬⥺ᮦ䛾⤌⧊䛸≉ᛶ㻌Flux Jumpsᅗ 㻞㻔㼍㻕䛻 㼀㼍 ᒙ䜢ཌ䛟ᨵⰋ䛧䛯䝞䝸䜰ᆺ 㻯㼡 ෆ㒊Ᏻᐃ໬⥺ᮦ
4.2 K
-0.4
䠄 䃥 㻝㻚㻟㻢㼙㼙 䠅 䛾 ᛴ ⇕ ᛴ ෭ ฎ ⌮ ๓ 䛾 ᩿ 㠃 ෗ ┿ 䜢 ♧ 䛩 䚹㻯㼡㻛㼚㼛㼚㻙㻯㼡 ẚ䛿 㻜㻚㻝㻢䚸㼀㼍㻔㻺㼎㻕㻛㻺㼎㻟㻭㼘 ẚ䛿 㻝㻚㻠㻣䚸䠦䠮㻔㻺㼎㻛㻭㼘㻕
-6
-4
-2
0
2
4
6
䝣䜱䝷䝯䞁䝖ᚄ䛿 㻡㻥P㼙䚸ྛ 㻺㼎㻛㻭㼘 䝣䜱䝷䝯䞁䝖࿘䜚䛾 㼀㼍 䝞䝸䜰ᒙ
Field (T)ཌ䛿 㻡㻚㻜ȝ㼙䚸䝣䜱䝷䝯䞁䝖㛫䛾 㻯㼡 䝞䝸䜰ཌ䛿 㻢㻚㻢ȝ㼙 䛷䛒䜛䚹䛿)LJ &RQILUPDWLRQ RI VXSSUHVVLRQ RI IOX[ MXPSV IRU &X
ILODPHQWEDUULHU5+471E$OZLUHV䛨䜑䛻▷ᑻヨᩱ䠄㻝㻞㻜㼙㼙䠅䜢⏝䛔䛶⡆౽䛻ᐇ㦂䛜䛷䛝䜛ᛴ⇕㻌ᛴ෭䝅䝭䝳䝺䞊䝍䜢฼⏝䛧䛶䚸㐣㣬࿴ᅛ⁐య䛜⏕ᡂ䛩䜛ᛴ⇕ㅰ㎡ ᮏ◊✲ࡣ⛉◊㈝㸦≉ᐃ㡿ᇦ◊✲ 㸧ࡢຓᡂࢆཷࡅ
ᛴ෭᮲௳䜢ㄪ䜉䛯䚹䛭䛾⤖ᯝ䚸㟁ᴟ㛫㊥㞳䛜 㻝㻜㻡㼙㼙䚸㏻㟁
ࡓࡶࡢ࡛࠶ࡿࠋ
䛩䜛୍ᐃ㟁ὶ್䛜 㻝㻥㻝㻙㻝㻥㻟㻭䚸㏻㟁ಖᣢ᫬㛫䛜 㻝㻚㻜㻥㻢 ⛊䛾᮲௳䛾䛸䛝䛻 㼎㼏㼏 ┦㐣㣬࿴ᅛ⁐య䛜⏕ᡂ䛩䜛᮲௳䜢ぢฟ䛧䛯䚹>@⳥ụࡽ  ᖺᗘ᫓Ꮨప ᕤᏛ࣭㉸㟁ᑟᏛ఍ㅮ₇ᴫせ㞟ḟ䛔䛷䚸㐣㣬࿴ᅛ⁐య䛜⏕ᡂ䛩䜛᮲௳䛻㛵䛩䜛䝅䝭䝳䝺䞊䝍S䛸 㼞㼑㼑㼘㻙㼠㼛㻙㼞㼑㼑㼘 ᛴ⇕ᛴ෭⿦⨨㛫䛾᥮⟬ಀᩘ䜢ồ䜑䚸ᨵⰋ䛧䛯>@77DNHXFKLHWDO,(((7UDQV$SSO6XSHUFRQG  䝞䝸䜰ᆺ 㻯㼡 ෆ㒊Ᏻᐃ໬⥺ᮦ䜢 㼞㼑㼑㼘㻙㼠㼛㻙㼞㼑㼑㼘 ⿦⨨䜢⏝䛔䛶
㻞㻥㻣㻭 䛸 㻟㻜㻜㻭 䛾㏻㟁㟁ὶ್䠄㻵㻾㻴㻽䠅䛷ᛴ⇕ᛴ෭ฎ⌮䛧䛶 㼎㼏㼏>@➉ෆࡽ ᖺᗘ⛅Ꮨప ᕤᏛ࣭㉸㟁ᑟᏛ఍ㅮ₇ᴫせ㞟S
┦㐣㣬࿴ᅛ⁐యከⰺ⥺䜢⏕ᡂ䛩䜛䛣䛸䛜䛷䛝䛯䚹 㻵㻾㻴㻽㻌 䛜― 81 ―

第83回

2010年度秋季低温工学・超電導学会

1D-a10

Nb3Al 線材

୰ᛶᏊᅇᢡ䛻䜘䜛 㻾㻴㻽㻙㻺㼎㻟㻭㼘 ㉸ఏᑟ⣲⥺䛾ṧ␃ṍ䜏ᐃ㻌㻺㼑㼡㼠㼞㼛㼚㻌㼐㼕㼒㼒㼞㼍㼏㼠㼕㼛㼚㻌㼙㼑㼍㼟㼡㼞㼑㼙㼑㼚㼠㻌㼛㼒㻌㼞㼑㼟㼕㼐㼡㼍㼘㻌㼟㼠㼞㼍㼕㼚㻌㼒㼛㼞㻌㻾㻴㻽㻙㻺㼎㻟㻭㼘㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼣㼕㼞㼑㼟㻌㔠㻌 ᪂ဴ䠈ᚎ㻌 ៞㔠䠈୰ᮏ㻌 ᘓᚿ䠈Ⲷὠ㻌 ㏱䠈ᅵᒇ㻌 Ύ⃈䠈ᒣᮏ㻌 ᫂䠄㻷㻱㻷䠅䠗⳥ụ㻌 ❶ᘯ䠈➉ෆ㻌 Ꮥኵ䠄㻺㻵㻹㻿䠅䠗㻌䝝䝹䝶㻌 䝇䝔䝣䜯䝚䝇䠈ఀ⸨㻌 ᓫⰾ䠈㎶ぢ㻌 ດ䠄ཎᏊຊᶵᵓ䠅䠗ᑠ㯮㻌 ⱥಇ䠈ῐ㊰㻌 ᬛ䠄ᮾ໭኱䠅㻌㼄㼕㼚㼦㼔㼑㻌㻶㼕㼚㻘㻌㻽㼕㼚㼓㼖㼕㼚㻌㼄㼡㻘㻌㼀㼍㼠㼟㼡㼟㼔㼕㻌㻺㼍㼗㼍㼙㼛㼠㼛㻘㻌㼀㼛㼞㼡㻌㻻㼓㼕㼠㼟㼡㻘㻌㻷㼕㼥㼛㼟㼡㼙㼕㻌㼀㼟㼡䠿䡄㼕㼥㼍㻘㻌㻭㼗㼕㼞㼍㻌㼅㼍㼙㼍㼙㼛㼠㼛㻌㻔㻷㻱㻷㻕㻧㻌㻭㼗㼕㼔㼕㼞㼛㻌㻷㼕㼗㼡㼠㼔㼕㻘㻌㼀㼍㼗㼍㼛㻌㼀㼍㼗㼑㼡㼏㼔㼕㻌㻔㻺㻵㻹㻿㻕㻧㻌㻿㼠㼑㼒㼍㼚㼡㼟㻌㻴㼍㼞㼖㼛㻘㻌㼀㼍㼗㼍㼥㼛㼟㼔㼕㻌㻵㼠㼛㻌㻔㻶㻭㻱㻭㻕㻘㻌㼀㼟㼡㼠㼛㼙㼡㻌㻴㼑㼙㼙㼕㻘㻌㻴㼕㼐㼑㼠㼛㼟㼔㼕㻌㻻㼓㼡㼞㼛㻘㻌㻿㼍㼠㼛㼟㼔㼕㻌㻭㼣㼍㼖㼕㻌㻔㼀㼛㼔㼛㼗㼡㻌㼁㼚㼕㼢㻚㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼟㼔㼕㼚㼠㼑㼠㼟㼡㻚㼗㼕㼚㻬㼗㼑㼗㻚㼖㼜㻌ὀ㔘㻌䝯䝑䜻䛧䛶䛛䜙↝ᡂ㻌䝯䝑䜻䛺䛧䛷↝ᡂ㻌
ヨᩱ 㻝 䛾 㻯㼡 䝯䝑䜻䛺䛧㻌㻯㼡 䝯䝑䜻䛺䛧䠄䃥㻜㻚㻣䠅㻌㻯㼡 䝯䝑䜻䛺䛧㻌䝯䝑䜻䛧䛶䛛䜙↝ᡂ㻌
ヨᩱ 㻢 䛾 㻯㼡 䝯䝑䜻㝖ཤ㻌౛䛸䛧䛶䚸㻲㼕㼓㻚㻌㻝 䛻ヨᩱ 㻢 䛾᩿㠃ᅗ䜢♧䛩䚹㻯㼡 䝯䝑䜻௨እ䚸䝬䝖䝸䝑䜽䝇䛿䛩䜉䛶 㻺㼎 䜢౑⏝䛧䛶䛔䜛䚹㻌&X

1E$O䢲䢲䢰䢷䢢䢢䢢䢢䢢䢢䢢䢢䢢䢢䢢䢢䣅䣷䢯䢳䢳䢳䣅䣷䢯䢴䢲䢲

Sample 1

䢳䢰䢲

䢳䢰䢷

d (Å)

䢴䢰䢲

䢢䢢䢢䢢䢢䢢䢢䢢䢢䢢䣖䣣䢯䢳䢳䢲䝬䝖䝸䝑䜽䝇
㼀㼍㻌
㼀㼍㻌
㼀㼍㻌
㻺㼎㻌
㼀㼍㻌
㻺㼎㻌
㻺㼎㻌

䢴䢲䢲

䝯䝑䜻㻌
㻯㼡㻌
㻙㻌
㻙㻌
㻙㻌
㻙㻌
㻯㼡㻌
㻌

ᐃ⤖ᯝཬ䜃ゎᯒ㻌㻲㼕㼓㻚㻌㻞 䛻䚸౛䛸䛧䛶ヨᩱ 㻝 䛾ᶓ᪉ྥ㻌 㻔㻺㼛㼞㼠㼔 䝞䞁䜽㻕㻌 䛛䜙䛾㻝 ᅇ┠䛾୰ᛶᏊᅇᢡ䛾 ᐃ⤖ᯝ䜢♧䛩䚹㻞㻝㻝 㠃䛾䝢䞊䜽䝣䜱䝑䝔䜱䞁䜾䛻䜘䜛᱁Ꮚᐃᩘ䛾ゎᯒ䛛䜙䚸」ᩘᅇ䛾 ᐃ䛷䛾ᶆ‽೫ᕪ䛿⣙ 㻜㻚㻜㻜㻡㻑௨ୗ䛷䛒䛳䛯䚹㖡䝯䝑䜻㝖ཤ๓ᚋ䛷䛒䜛ヨᩱ 㻝 䛸ヨᩱ 㻟 䛾⤖ᯝ䜢ẚ㍑䛩䜛䛸䚸⇕཰⦰⋡䛾኱䛝䛔 㻯㼡 䝯䝑䜻䛻䜘䛳䛶䚸⣲⥺ෆ䛾 㻺㼎㻟㻭㼘 䛿ᶓ᪉ྥ䛸㍈᪉ྥ䛷䛭䜜䛮䜜㻜㻚㻜㻡㻝㻑䛸 㻜㻚㻜㻠㻟㻑䛾ᅽ⦰ṍ䜏䛜ຍ⟬䛥䜜䛶䛔䜛䛣䛸䛜ุ䛳䛯䚹
ヨᩱ 㻟 䛸ヨᩱ 㻣 䛾ẚ㍑䛛䜙䛿⇕཰⦰⋡䛾ᑠ䛥䛔 㼀㼍 䛸኱䛝䛔㻺㼎 䝬䝖䝸䝑䜽䝇䛾㐪䛔䛜䛿䛳䛝䜚䛸ぢ䜙䜜䛯䚹䛭䛾௚䛾ヲ⣽⪃ᐹ䛻䛴䛔䛶䛿Ꮫ఍䛻䛚䛔䛶ሗ࿌䛩䜛䚹㻌䢢䢢䢢䢢䢢䢢䢢䢢䢢䢢䢢䢴䢳䢳䢢䢢䢢䢢䢢䢢䢴䢳䢲

㻌
ヨᩱ 㻝㻌
ヨᩱ 㻞㻌
ヨᩱ 㻟㻌
ヨᩱ 㻠㻌
ヨᩱ 㻡㻌
ヨᩱ 㻢㻌
ヨᩱ 㻣㻌

㻟䠊

䣅䣷䢯䢴䢴䢴䢮䢢䣖䣣䢯䢵䢳䢲䣅䣷䢯䢵䢳䢳
䢢䢢䢢䢢䢢䢢䢶䢴䢳䢶䢴䢲䢮䢢䣖䣣䢯䢴䢴䢲䣅䣷䢯䢴䢴䢲
䣖䣣䢯䢴䢳䢳 䢢䢢䢢䢢䢢䢢䢶䢲䢲䢢䢢䢢䢢䢢䢢䢵䢴䢳䢴䢴䢴䢢䢢䢢䢢䢢䢢䢵䢴䢲䢵䢳䢲䢮䢢䣖䣣䢯䢴䢲䢲㻞䠊୰ᛶᏊᅇᢡ ᐃ㻌㻶㻙㻼㻭㻾㻯 䛾䛂໶䛃䛿䝟䝹䝇୰ᛶᏊ䜢⏝䛔䛯㣕⾜᫬㛫ᆺᅇᢡ⿦⨨䛷䛒䜚䚸䛭䛾≉ᚩ䛿ᅛᐃ䛧䛯᳨ฟჾ䛷」ᩘ䛾 㼔㼗㼘 ᅇᢡ䝢䞊䜽䜢ྠ᫬䛻 ᐃ䛩䜛䛣䛸䛜䛷䛝䜛䛣䛸䛷䛒䜛䚹㻶㻙㻼㻭㻾㻯 䛾୰ᛶᏊ※䛿 㻝㻹㼃 㐠㌿䛷タィ䛥䜜䛶䛚䜚䚸⌧ᅾ䛿᪤䛻 㻝㻞㻜㼗㼃 䛷㐠㌿䛧䛶䛔䜛䚹ධᑕ䝡䞊䝮䛻ᑐ䛧䛶ᩓ஘ゅ䛜 㻥㻜㼻ཬ䜃㻙㻥㻜㼻䛻䛺䛳䛶䛔䜛䠎䛴䛾᳨ฟჾ䝞䞁䜽䛜ഛ䜟䛳䛶䛔䜛䚹䛭䛾䛯䜑䚸⣲⥺䜢ධᑕ䝡䞊䝮䛻ᑐ䛧䛶 㻠㻡㼻ഴ䛡䛶タ⨨䛩䜛䛣䛸䛻䜘䜚䚸⣲⥺䛾ᶓཬ䜃㍈᪉ྥ䛾᱁Ꮚᐃᩘ䜢ྠ᫬䛻 ᐃ䛷䛝䜛䚹ᐇ㦂䛻⏝䛔䛯⣲⥺䛷䛿 㻺㼎㻟㻭㼘 䛾య✚ศ⋡䛜ᑠ䛥䛔䛯䜑䚸໶䛷䛾 ᐃ䛿㧗ᙉᗘ䝰䞊䝗䠄ṍ䜏 ᐃ⢭ᗘ䛜 㻜㻚㻜㻝㻑௨ୗ䠅䛷⾜䛳䛯䚹㻌㼀㼍㼎㼘㼑㻌㻝 䛻 ᐃ䛧䛯ヨᩱ䛾≉ᚩ䜢♧䛩䚹ヨᩱ 㻡 䛾䜏䛿⣲⥺䛾୰ᚰ㒊䠄㻺㼎䠅䛜䝬䝖䝸䝑䜽䝇㻔㼀㼍㻕䛸␗䛺䜛ᮦᩱ䛷䛒䜛䚹㻌㼀㼍㼎㼘㼑㻌㻝㻌 ⣲⥺ヨᩱ䛾≉ᚩ㻌⣲⥺䜢䛩䜉䛶 㻞㻜㼙㼙 䛻䜹䝑䝖䛧䚸ྛヨᩱ䜢 㻣 ᮏ䛪䛴᮰䛽䛶䚸䠓䛴䛾ヨᩱ䛜㐃⥆䛻 ᐃ䛷䛝䜛䜘䛖䛻ヨᩱྎ䛻୪䜉䛶ᅛᐃ䛧䛯䚹䠍䛴䛾ヨᩱ䛾 㻝 ᅇ䛾䝡䞊䝮↷ᑕ᫬㛫䛿䚸䛚䜘䛭 㻞㻜 ศ㛫䛷䛒䛳䛯䚹ヨᩱ 㻝 䛛䜙ヨᩱ 㻣 䜎䛷䝡䞊䝮↷ᑕ఩⨨䜢⛣ື䛧䛺䛜䜙ᐃ䛧䛯ᚋ䚸䜎䛯ඖ䛻ᡠ䛳䛶ヨᩱ 㻝 䛛䜙ヨᩱ 㻣 䜎䛷 ᐃ䜢⧞䜚㏉䛧䛯䠄䠏䡚䠑ᅇ䠅䚹㻌

Intensity (a.u.)㻝䠊䛿䛨䜑䛻㻌
ຍ㏿ჾ⏝㉸㟁ᑟ☢▼䛾㉸㟁ᑟ⥺ᮦ䛾୰䛷䚸௒䜎䛷㛤Ⓨ䛜㐍䜑䜙䜜䛶䛝䛯 㻺㼎㼀㼕 䛸 㻺㼎㻟㻿㼚㻔㻝㻕䛻ẚ䜉䚸㻺㼎㻟㻭㼘 䛾ᇶ♏≀ᛶཬ䜃ᛂ⏝䛻㛵䛩䜛◊✲䛿䜎䛰୙༑ศ䛾䜎䜎䛷䛒䜛䚹ᡃ䚻䛿㻯㻱㻾㻺 䛾 㻸㻴㻯 ຍ㏿ჾ䜰䝑䝥䜾䝺䞊䝗䛻ྥ䛡䚸ᛴ⇕ᛴ෭ἲ䠄㻾㻴㻽䠅㻙㻺㼎㻟㻭㼘㻔㻞㻕⥺ᮦ䜢⏝䛔䛯㉸㟁ᑟ☢▼䛾㛤Ⓨ䜢㐍䜑䛶䛚䜚䚸㻺㼎㻟㻭㼘 ⥺ᮦ䛾ᇶ♏ⓗ≉ᛶ䛾䛥䜙䛺䜛⌮ゎ䛿୙ྍḞ䛷䛒䜛䚹㻌䛭䛣䛷ᮏ◊✲䛷䛿䚸䝬䝖䝸䝑䜽䝇ᮦᩱ䛾✀㢮䜔Ᏻᐃ໬㖡䛾᭷↓䛻㐪䛔䛜䛒䜛 㻣 ✀㢮䛾 㻾㻴㻽㻙㻺㼎㻟㻭㼘 ㉸ఏᑟ⣲⥺䛻䛴䛔䛶䚸୰ᛶᏊᅇᢡἲ䜢⏝䛔䚸⇕ฎ⌮ᚋ䛾⣲⥺䛾⤖ᬗ᱁Ꮚෆṧ␃ṍ䜏 ᐃ䜢⾜䛳䛯䚹ᐇ㦂䛿䚸㻶㻙㻼㻭㻾㻯 ୰ᛶᏊ䝡䞊䝮䝷䜲䞁䛂໶䛃䛻䛚䛔䛶ᐇ᪋䛧䛯䚹㻌

䢴䢰䢷

䢵䢰䢲

)LJ1HXWURQGLIIUDFWLRQSDWWHUQRIWKHVDPSOH㻠䠊䜎䛸䜑㻌
௒ᅇ䛿㻞㻝㻝㠃䛾䝢䞊䜽䛾ゎᯒ䜢⾜䛔䚸㻺㼎㻟㻭㼘⣲⥺䛾㻯㼡䝯䝑䜻䛾᭷↓ཬ䜃䝬䝖䝸䝑䜽䝇ᮦ䠄㼀㼍䚸㻺㼎䠅䛾㐪䛔䛻䜘䜚ṧ␃ṍ䜏䛜␗䛺䜛䛣䛸䛜䜟䛛䛳䛯䚹䛭䛾ṧ␃ṍ䜏䛿䝬䝖䝸䝑䜽䝇ᮦ౫Ꮡᛶ䛜኱䛝䛟䚸㻯㼡䝯䝑䜻䛻䜘䜛ᙳ㡪䛿䛭䜜䜘䜚䜒ᑠ䛥䛛䛳䛯䚹㻌㻡㻚㻌௒ᚋ䛾ணᐃ㻌㻌 㻺㼎㻟㻭㼘⢊ᮎヨᩱ䛾ᖖ ཬ䜃ప 䛻䛚䛡䜛᱁Ꮚᐃᩘ ᐃ䚸⣲⥺䛾᱁Ꮚᐃᩘཬ䜃㻶㼏䛾ᘬᙇ౫Ꮡᛶ䛾 ᐃ䚸⣲⥺䛾㧗 䛷䛾ᘬᙇヨ㦂䜢௒ᗘ䛾ㄢ㢟䛸䛧䛶䛔䜛䚹㻌

1E
)LJ&URVVVHFWLRQRI1E$OVWUDQGIRUWKHVDPSOHཧ⪃ᩥ⊩㻌㻝㻚㻌 㻿㻚㻌 㻭㼣㼍㼖㼕㻘㻌 㼑㼠㻌 㼍㼘㻚㻦㻌 㻵㻱㻱㻱㻌 㼀㼞㼍㼚㼟㻚㻌 㻭㼜㼜㼘㻚㻌 㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻘㻌 㼂㼛㼘㻚㻌 㻝㻢㻌㻔㻞㻜㻜㻢㻕㻌㼜㻚㻌㻝㻞㻞㻤㻚㻌㻞㻚㻌㻭㻚㻌㻷㼕㼗㼡㼏㼔㼕㻘㻌㼑㼠㻌㼍㼘㻚㻦㻌㻵㻱㻱㻱㻌㼀㼞㼍㼚㼟㻚㻌㻭㼜㼜㼘㻚㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻘㻌㼂㼛㼘㻚㻌㻝㻡㻌㻔㻞㻜㻜㻡㻕㻌㼜㻚㻌㻟㻟㻣㻞㻚㻌― 82 ―

第83回

2010年度秋季低温工学・超電導学会

1D-a11

Nb3Al 線材

㐣㣬࿴ᅛ⁐య෌䝇䝍䝑䜽ἲ䛻䜘䜛 㻺㼎㻟㻭㼘 ⥺ᮦ䛾㛗ᑻ໬ヨస⤖ᯝ㻌'UDZDELOLW\WHVWUHVXOWVRIORQJOHQJWK1E$OZLUHE\PHWDVWDEOHVROLGVROXWLRQVWUDQGUHVWDFNLQJPHWKRG㻌୰ᕝ㻌 ࿴ᙪ䠈㻌 Ḉ஭㻌 ⩏༤䠄᪥❧㟁⥺䠅䠗㻌 క㔝㻌 ಙဢ䠈㻌 ➉ෆ㻌 Ꮥኵ䠄㻺㻵㻹㻿䠅䠗㻌 ᅵᒇ㻌 Ύ⃈䠄㻷㻱㻷䠅㻌㻺㻭㻷㻭㻳㻭㼃㻭㻌㻷㼍㼦㼡㼔㼕㼗㼛䠈㻌 㻿㻭㻷㼁㻾㻭㻵㻌㼅㼛㼟㼔㼕㼔㼕㼞㼛㻌 䠄㻴㼕㼠㼍㼏㼔㼕㻌㻯㼍㼎㼘㼑䠅䠗㻌㻮㻭㻺㻺㻻㻌㻺㼛㼎㼡㼥㼍䠈㻌 㼀㻭㻷㻱㼁㻯㻴㻵㻌㼀㼍㼗㼍㼛䠄㻌 㻺㻵㻹㻿㻌 䠅㻧㻌㼀㻿㼁㻯㻴㻵㼅㻭㻌㻷㼕㼥㼛㼟㼡㼙㼕㻔㻌㻷㻱㻷㻌㻕㻌㻱㻙㼙㼍㼕㼘䠖㻌 㼚㼍㼗㼍㼓㼍㼣㼍㻚㼗㼍㼦㼡㼔㼕㼗㼛㻬㼔㼕㼠㼍㼏㼔㼕㻙㼏㼍㼎㼘㼑㻚㼏㼛㻚㼖㼜㻌㻠䠊ཧ⪃ᩥ⊩㻌㻝䠊䛿䛨䜑䛻㻌㻌 䠍㻌 క㔝ಙဢ௚䚸㻞㻜㻜㻤 ᖺᗘ⛅Ꮨప ᕤᏛ䞉㉸㟁ᑟᏛ఍䚸㻌㻌 ᛴ⇕ᛴ෭䞉ኚែ䠄5+47䠅ἲ 1E$O ⥺ᮦ䛻䛸䛳䛶᭱኱䛾ㄢ㢟䛷㻌 㻌 㻝㻼㻙㼜㻜㻢㻌䛒䜛Ᏻᐃ໬ᮦ䛾」ྜ໬᪉ἲ䛸䛧䛶䚸㐣㣬࿴ᅛ⁐య䛾෌䝇䝍䝑㻌 㻞㻌 క㔝ಙဢ௚㻘㻌㻞㻜㻝㻜 ᖺᗘ᫓Ꮨప ᕤᏛ䡡㉸㟁ᑟᏛ఍㻘㻌 㻌䜽ἲ䛾㛤Ⓨ䜢㐍䜑䛶䛝䛯䚹㻌 㻌 㻌 㻝㻰㻙㼍㻜㻤㻌㻌 ෌䝇䝍䝑䜽ἲ䛿㐣㣬࿴ᅛ⁐య⥺ᮦ䜢ከᩘᮏ㖡⟶䛻⤌㎸䜣䛷䚸ఙ⥺䛻䜘䜚」ྜ໬䛩䜛䜒䛾䛷䚸䛣䜜䜎䛷䛾௚䛾Ᏻᐃ໬ᮦ」ྜ
ᑦ䚸ᮏ◊✲䛾୍㒊䛿ᖹᡂ  ᖺᗘ⏘ᴗᢏ⾡◊✲ຓᡂ஦ᴗ䛾ἲ䛻ẚ䜉䛶ᙉᅛ䛻」ྜ໬䛷䛝䜛≉ᚩ䜢ᣢ䛳䛶䛔䜛䚹䛧䛛䛧䚸䛣୍⎔䛷⾜䜟䜜䛯㻌
䜜䜎䛷䛿ᐇ⏝䝺䝧䝹䛾㛗ᑻຍᕤ䛜ᅔ㞴䛰䛳䛯䚹㻌 ᮏሗ࿌䛷䛿ᐇ⏝䝺䝧䝹㛗ᑻ໬䛾ึᮇẁ㝵䛸䛧䛶ᐇ᪋䛧䛯7DEOH6SHFLILFDWLRQRIUHVWDFNHGZLUHP ⣭෌䝇䝍䝑䜽ἲ⥺ᮦヨస䛻䛴䛔䛶ሗ࿌䛩䜛䚹㻌
QXPEHURIVROLGVROXWLRQVWUDQG㻞䠊ᐇ㦂᪉ἲ㻌
QXPEHURIFHQWUDOFRSSHUGXPP\㻌 䝍䞁䝍䝹እ⿕䛾 㻺㼎㻛㻭㼘 」ྜከⰺ⥺ᮦ䜢 㻾㻴㻽 ฎ⌮䛧㐣㣬࿴
GLDPHWHURIUHVWDFNZLUH䃥PPᅛ⁐య⥺ᮦ䜢〇స䛧䛯䚹䝍䞁䝍䝹እ⿕⥺ᮦ䜢౑⏝䛩䜛⌮⏤䛿䚸OHQJWKRIUHVWDFNZLUHP䝙䜸䝤እ⿕⥺ᮦ䛻ẚ䜉䛶䚸㻾㻴㻽 ฎ⌮᫬䛻⥺ᮦ⾲㠃䛻䜺䝸䜴
QXPEHURIILODPHQW䝮䛸䛾໬ྜ≀䜢⏕ᡂ䛧䛻䛟䛟䚸䛭䛾ᚋ䛾ఙ⥺䛻䛚䛔䛶䜒ຍᕤᛶ
GLDPHWHURIILODPHQW䃛P䛻ᙳ㡪䛜ᑡ䛺䛔Ⅽ䛷䛒䜛䚹㻌
FRSSHUUDWLR㻌 ḟ䛻⾲㠃䛾䜺䝸䜴䝮䜢㝖ཤ䛧䛶භゅᡂᆺ䛧䛯 㻢 ᮏ䛾㐣㣬࿴ᅛ⁐య⥺ᮦ䛸䚸ྠ䛨䝃䜲䝈䛷භゅᡂᆺ䛧䛯㖡⥺䜢୰ᚰ䛻㓄⨨䛧䛶ྜィ 㻣 ᮏ䛾⥺ᮦ䜢㖡⟶䛻ᤄධ䛧䛶⤌㎸䜣䛰䚹㻌㻌 ⤌㎸ᚋ䛿ᘬᢤ䛝ఙ⥺䛻䜘䜚⦰ᚄຍᕤ䜢䛧䛶䚸Ᏻᐃ໬ᮦ䛷䛒䜛㖡⟶䛸㐣㣬࿴ᅛ⁐య⥺ᮦ䛸䜢」ྜ໬䛥䛫䛯䚹㻌㻌 ෌䝇䝍䝑䜽ἲ䛾ヨస⥺ᮦ௙ᵝ䜢 㼀㼍㼎㼘㼑㻌㻝 䛻♧䛩䚹㻌㻌 䜎䛯䚸ᮏヨస䛷⤌㎸䜣䛰㐣㣬࿴ᅛ⁐య⥺ᮦ䛿䚸㻾㻴㻽 ฎ⌮᮲௳䜢ᚑ᮶䛾ᐃ㟁ὶ䝰䞊䝗ฎ⌮䛛䜙ᐃ㟁ᅽ䝰䞊䝗ฎ⌮䛻ኚ᭦䛧䛶⏝䛔䛯䚹㻌㻟䠊ᐇ㦂⤖ᯝ䛸⪃ᐹ㻌㻌 ヨస⥺ᮦ䛾⤌㎸䛷䛿䚸౑⏝䛩䜛㖡⟶䛸⤌㎸ᮦ䛸䛾䜼䝱䝑䝥䛾タᐃ䛜㔜せ䛷䚸㛗ᑻ⤌㎸䛾䛯䜑䛻䛿⤌㎸ᮦ䛾ᤄධ䛜ᐜ᫆䛷䛒䜛䛣䛸䛸䚸⤌㎸㐣⛬䛷⥺ᮦྠኈ䛾⤌ྜ䛫䛜ᔂ䜜䛺䛔䛣䛸䜢㻌 㻌 㻌 㻌 㻌 㻌 㻲㼕㼓㼡㼞㼑㻌㻝㻌㻻㼢㼑㼞㻌㼢㼕㼑㼣㻌㼛㼒㻌㻝㻜㻜㼙㻙㼘㼑㼚㼓㼠㼔㻌㼞㼑㼟㼠㼍㼏㼗㼑㼐㻌㼣㼕㼞㼑㻌୧❧䛩䜛䜘䛖䛺䜼䝱䝑䝥䛸䛧䛶䚸㻜㻚㻡㼙㼙 䛻タᐃ䛧䛯䚹㻌 ‽ഛ䛧䛯 㻝㻜㼙 㛗䛾㖡⟶䛻⤌㎸ᮦ 㻣 ᮏ䜢ᤄධ䛩䜛䛣䛸䛜䛷䛝䚸䛣䜜䜢ᘬᢤ䛝ఙ⥺䛻䜘䜚」ྜ໬ຍᕤ䛧䛯䚹ᘬᢤ䛝ఙ⥺䛻䜘䜚⥺ᚄ䃥1.00mm 䜎䛷ຍᕤ䛧䛯⤖ᯝ䚸㏵୰䛷୍ᅇ䛾᩿⥺䛜Ⓨ⏕䛧䛯䜒䛾䛾䚸⥺ᮦ㛗䛿 102m 䛸䛺䜚┠ᶆ㛗䛥䜢䜽䝸䜰䛧䛯䚹㻌 䛭䛾ᚋ䛥䜙䛻䚸䛣䛾⥺ᮦ䜢䃥0.808mm 䜎䛷ఙ⥺ຍᕤ䜢⥅⥆䛧䛯⤖ᯝ䚸෌ᗘ୍ᅇ᩿⥺䛜Ⓨ⏕䛧䛯䛜䚸䛭䜜௨㝆䛿↓᩿⥺䛷ఙ⥺䛷䛝䚸䝒䜲䝇䝖ຍᕤ䜒ຍ䛘䛯≧ែ䛷䃥0.808mm 䛷 102m 㛗䛾⥺ᮦ䛸䛺䛳䛯䚹Fig 1 䛻䛿〇స䛧䛯 100m ⣭⥺ᮦ䛾እほ෗┿䛸䚸Fig 2 䛻䛿䛭䛾᩿㠃෗┿䜢♧䛩䚹㻌 ᮏヨస䛷䛾⤌㎸㛗 10m 䛿䚸⌧≧䛾⤌㎸ἲ䛾䜋䜌㝈⏺䛸⪃䛘䜙䜜䜛䛜䚸෌䝇䝍䝑䜽ἲ⥺ᮦ䛾Ᏻᐃ໬㖡䛾」ྜ≧ែ䛿䚸ỗ⏝㉸㟁ᑟ⥺ᮦ䛸ྠᵝ䛾䝺䝧䝹䛷䛒䜚䚸௒ᚋ⤌㎸᪉ἲ䛾ᨵၿ䜢
㐍䜑䚸km ⣭㛗䛥䛜ᐇ⌧䛷䛝䜛䜘䛖䛻䛺䜜䜀䚸ᵝ䚻䛺⏝㏵䜈䛾㐺⏝ྍ⬟ᛶ䛜㧗䛔䛸⪃䛘䜙䜜䜛Ⅽ䚸㛗ᑻ⤌㎸ἲ䜢ྵ䜑䛯ᐇ⏝䝺䝧䝹䛾㛗ᑻ໬䜢㐍䜑䛶䛔䛟䚹㻌 㻌 㻌 㻌 㻌 㻲㼕㼓㼡㼞㼑㻌㻞㻌 㻯㼞㼛㼟㼟㻌㼟㼑㼏㼠㼕㼛㼚㼍㼘㻌㼢㼕㼑㼣㻌㼛㼒㻌㻝㻜㻜㼙㻙㼘㼑㼚㼓㼠㼔㻌㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㼞㼑㼟㼠㼍㼏㼗㼑㼐㻌㼣㼕㼞㼑― 83 ―

第83回

2010年度秋季低温工学・超電導学会

1D-a12

Nb3Al 線材

㐣㣬࿴ᅛ⁐యᙉຍᕤヨᩱࡢ┦ኚែ 1E$O ᚤ⣽⤌⧊ほᐹ

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1㸬ࡣࡌࡵ࡟ ┦ኚែ 1E$O ⥺ᮦࡢ -F ≉ᛶࡣ㸪ᛴ⇕ᛴ෭ฎ⌮࡟ࡼࡾ⏕ᡂࡋࡓẕ┦ࡢ 1E$O 㐣㣬࿴ᅛ⁐య࡬ࡢຍᕤ࡟ࡼࡗ࡚ྥୖࡍࡿࠋ
ຍᕤ࡟ࡼࡗ࡚┦ኚែᚋࡢ⤖ᬗ⢏ࢧ࢖ࢬࡀῶᑡࡍࡿࡇ࡜࡛㸪☢᮰ࣆࣥṆࡵⅬ࡜࡞ࡿ⢏⏺ࡀቑ࠼ࡓࡇ࡜ࡀ኱ࡁ࡞せᅉ࡜⪃࠼ࡽࢀ࡚࠸ࡿࠋ୍᪉᭱㏆㛤Ⓨࡉࢀࡓ͆ࣜࢫࢱࢵࢡἲ͇1E$O⥺ᮦ࡛ࡣ㸪㐣㣬࿴ᅛ⁐యࡀ ㏆࠸ᙉຍᕤࢆ⤒㦂ࡋࡓᚋ࡛┦ኚែࡍࡿࡓࡵ㸪ࡇࢀࡲ࡛࡟࡞࠸ᚤ⣽⤌⧊ࡀほᐹࡉࢀࡿྍ
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⬟ᛶࡀ࠶ࡗࡓࠋ௒ᅇࡇࡢࣜࢫࢱࢵࢡἲ 1E$O ⥺ᮦࢆᑐ㇟࡟
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Grain Tolerance Angle: 5-F ≉ᛶ࡜ྜࢃࡏ࡞ࡀࡽࡑࡢ⤌⧊ᵓ㐀࡟ࡘ࠸࡚ሗ࿌ࡋࡓ࠸ࠋ
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 ࣜࢫࢱࢵࢡἲ 1E$O ⥺ᮦࡣ㸪ᛴ⇕ᛴ෭ฎ⌮࡟ࡼࡾᙧᡂࡉ
10ࢀࡓ‽Ᏻᐃࡢ 1E$O 㐣㣬࿴ᅛ⁐య⥺ᮦࢆᏳᐃ໬ᮦ࡜࡞ࡿ↓㓟⣲㖡⟶࡟෌ࢫࢱࢵࢡ࣭ఙ⥺ࡋ࡚〇సࡉࢀࡿ㹙㹛ࠋࡑࡢ
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ᙉຍᕤࡀ᪋ࡉࢀࡿࡇ࡜ࡀ≉ᚩ࡜࡞ࡿࠋࡇࢀࡲ࡛ࡢ◊✲࠿ࡽ㸪
0.1
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Grain
Diameter(Pm)
ྥୖࡢຠᯝࡀ࠶ࡿࡇ࡜ࡀࢃ࠿ࡗ࡚࠸ࡿ㹙㹛ࠋࡑ࠺࠸࠺ព࿡
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ࢀ PP㸪㸪w P ࡛࠶ࡿࠋ

3㸬⤖ᯝ࡜⪃ᐹ )LJ ࡟ (%6' ゎᯒ࡛ᚓࡽࢀࡓ⤖ᬗ᪉఩࣐ࢵࣉ㸦,QYHUVH
3ROH)LJXUH㸧࡜⢏ᚄศᕸࢳ࣮ࣕࢺࡢࢢࣛࣇࢆ♧ࡍࠋ༢⣧࡞㠃✚ᖹᆒ࡟ࡼࡿ⢏ᚄ G1 ࡣ QP㸪ྛ㠃✚ࡢ㔜ࡳࡘࡁᖹᆒ
࡛ᐃ⩏ࡉࢀࡿ G$) ࡣ QP ࡜࡞ࡾ㸪ྠࡌ (%6' ศᯒ࡛ᚓࡽ
ࢀࡓᚑ᮶⥺ᮦࡢ G$) ࡀ w P ࡛࠶ࡿࡢ࡟ẚ࡭㹙㹛㸪᱁ẁ࡟ᚤ⣽໬ࡋ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿࠋ୍᪉࡛໬ྜ≀࠶ࡓࡾࡢ -F㸾.7 ࡣ⣙ $PP ࡛࠶ࡾᚤ⣽໬ࡢຠᯝࡣ࡯࡜ࢇ࡝ぢࡽࢀ࡞࠿ࡗࡓࠋኚែἲ 1E$O ࡢሙྜ࡟ࡣ㸪⢏⏺ᐦᗘࡔࡅ࡛࡞ࡃ⢏⏺ࡢ᪉఩ᕪࡶᙳ㡪ࡀ࠶ࡿࡢ࠿ࡶࡋࢀ࡞࠸ࠋ )LJ ࡟ࡣ 1E$O ⤖ᬗ⢏ࡢ 67(0 ࡢ᫂ど㔝ീࢆ♧ࡍࠋ7(0ほᐹࡢሙྜ࡛ࡶほᐹࡉࢀࡿ⤖ᬗ⢏ࡣᖹᆒࡋ࡚ QP ⛬ᗘ࡛࠶ࡿࡇ࡜ࡀ☜ㄆࡉࢀࡓࠋຍ࠼࡚⤖ᬗ⢏ࡢ୰࡟ࡣᯈ≧Ḟ㝗ࢆྵࡴ㡿ᇦ࡜ྵࡲ࡞࠸㡿ᇦࢆࡶࡘ⢏ࡀ࠶ࡿࡇ࡜ࡶほᐹࡉࢀࡓࠋ('6 ศᯒ࠿ࡽ㸪ᯈ≧Ḟ㝗ࢆྵࡲ࡞࠸㡿ᇦ 㸪 ࡛ࡣ$O ⃰ᗘࡀ ࡞ࡢ࡟ᑐࡋ㸪ྵࡴ㡿ᇦ 㸪 ࡛ࡣ ㏆࠸್ࢆ♧ࡍࡇ࡜ࡶ☜ㄆࡉࢀࡓࠋࡇࢀࡽࡢࡇ࡜࠿ࡽ㸪ᛴ෭ᚋࡢ$O ࣜࢵࢳ┦ࡀᯈ≧Ḟ㝗ࢆⓎ⏕ࡉࡏࡿẕయ࡜࡞ࡗ࡚࠸ࡿྍ
⬟ᛶࡀ㧗࠸ࠋ୍᪉࡛ࡇ࠺ࡋࡓ㡿ᇦࡀ☢᮰ࣆࣥṆࡵⅬ࡟࡞ࡗ)LJ%)67(0LPDJHRI1E$OJUDLQRI5HVWDFNZLUH
1 %DQQR HW DO  6WUDLQ WROHUDQFH LQ WHFKQLFDO 1E$O
VXSHUFRQGXFWRUV6XSHUFRQ6FL7HFKQRO
1%DQQRHWDO0LQLPL]DWLRQRIWKHK\VWHUHVLVORVVDQGORZILHOGLQVWDELOLW\LQWHFKQLFDO1E$OFRQGXFWRUV6X67 SS 
1 %DQQR HW DO  5HODWLRQVKLS EHWZHHQ EFFGHIRUPDWLRQWUDQVIRUPDWLRQWHPSHUDWXUHDQGPLFURVWUXFWXUHLQ1E$OZLUHV,(((7UDQV$SSO6XSHUFRQG
7 7DNHXFKL HW DO SUHVHQWHG DW $SSOLHG 6XSHUFRQGXFWLYLW\&RQIHUHQFH
࡞࠾ᮏ◊✲ࡢ୍㒊ࡣᖹᡂ  ᖺᗘ⏘ᴗᢏ⾡◊✲ຓᡂ஦ᴗࡢ୍⎔࡛⾜ࢃࢀࡓࠋ

― 84 ―

第83回

2010年度秋季低温工学・超電導学会

1D-p01

MgB2 (2)㻱㼤㻙㼟㼕㼠㼡 ἲ 㻹㼓㻮㻞 䝞䝹䜽䛻䛚䛡䜛↝⤖᮲௳䛸⮫⏺㟁ὶ≉ᛶ䛾㛵ಀ㻌㻾㼑㼘㼍㼠㼕㼛㼚㼟㼔㼕㼜㻌㼎㼑㼠㼣㼑㼑㼚㻌㼟㼕㼚㼠㼑㼞㼕㼚㼓㻌㼏㼛㼚㼐㼕㼠㼕㼛㼚㼟㻌㼍㼚㼐㻌㼏㼞㼕㼠㼕㼏㼍㼘㻌㼏㼡㼞㼞㼑㼚㼠㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼛㼒㻌㼑㼤㻙㼟㼕㼠㼡㻌㻹㼓㻮㻞㻌㼎㼡㼘㼗㼟㻌⏣୰㻌 ⿱ஓ㻘㻌 ᒣᮏ㻌 ᫂ಖ㻘㻌 ‫‮‬ᮏ㻌 ⱥᏹ㻘㻌 Ⲷ㔝㻌 ᣅ㻘㻌 ୗᒣ㻌 ῟୍㻘㻌 ᓊᑿ㻌 ග஧㻌 䠄ᮾ኱䠅㻌㼀㻭㻺㻭㻷㻭㻌㻴㼕㼞㼛㼥㼍㻘㻌㼅㻭㻹㻭㻹㻻㼀㻻㻌㻭㼗㼕㼥㼍㼟㼡㻘㻌㼅㼁㻹㻻㼀㻻㻌㻴㼕㼐㼑㼔㼕㼞㼛㻘㻌㻻㻳㻵㻺㻻㻌㻴㼕㼞㼍㼗㼡㻘㻌㻿㻴㻵㻹㻻㼅㻭㻹㻭㻌㻶㼡㼚㻙㼕㼏㼔㼕㻘㻌㻷㻵㻿㻴㻵㻻㻌㻷㼛㼔㼖㼕㻌㻔㼁㼚㼕㼢㻚㻌㼛㼒㻌㼀㼛㼗㼥㼛㻕㻌㻱㻙㼙㼍㼕㼘㻌㻦㻌㼠㼠㻝㻜㻢㻢㻣㻜㻬㼙㼍㼕㼘㻚㼑㼏㼏㻚㼡㻙㼠㼛㼗㼥㼛㻚㼍㼏㻚㼖㼜㻝䠊䛿䛨䜑䛻㻌
㔠ᒓ⣔㉸ఏᑟయ䛷᭱㧗䛾 㼀㼏㻌㻔䡚㻠㻜㻌㻷㻕㻌 䜢ᣢ䛴 㻹㼓㻮㻞 ᮦᩱ䛿䚸ᾮయ䝦䝸䜴䝮䝣䝸䞊䛾 㻝㻡㻙㻞㻜㻌㻷 䛷ᐇ⏝䛜ྍ⬟䛷Ọஂ㟁ὶᅇ㊰䛾ᵓᡂ䜒ᐜ᫆䛺䛣䛸䛛䜙䚸་⒪⏝ 㻹㻾㻵 䛺䛹䜈䛾ᛂ⏝䛜ᮇᚅ䛥䜜䛶䛔䜛䚹䛧䛛䛧䚸⌧≧䛾 㻹㼓㻮㻞 ⥺ᮦ䛿 㻺㼎㼀㼕 ⥺ᮦ䚸㻺㼎㻟㻿㼚 ⥺ᮦ䛸ẚ㍑䛧䛶 㻶㼏 䛜ప䛟䚸䛭䛾ཎᅉ䛸䛧䛶ከ⤖ᬗయ䛻䛚䛡䜛ప䛔䝁䝛䜽䝔䜱䝡䝔䜱䛜ᣦ᦬䛥䜜䛶䛔䜛䚹㻌㻹㼓㻮㻞 ከ⤖ᬗᮦᩱ䛾స〇᪉ἲ䛻䛿䚸㻹㼓 䛸 㻮 䛾ΰྜཎᩱ䛛䜙⇕ฎ⌮䛻䜘䛳䛶 㻹㼓㻮㻞 䜢⏕ᡂ䛥䛫䜛 㼕㼚㻙㼟㼕㼠㼡 ἲ䛸䚸᪤〇䛾㻹㼓㻮㻞 䜢཯ᛂᐜჾ䛻඘ሸᚋ䚸ຍᕤ䞉⇕ฎ⌮䛻䜘䛳䛶⥺ᮦ䚸䝞䝹䜽䜢ᚓ䜛 㼑㼤㻙㼟㼕㼠㼡 ἲ䛜䛒䜛䚹㼕㼚㻙㼟㼕㼠㼡 ἲ䛛䜙䛿⢏㛫䛾⤖ྜ䛜ᙉ䛟䚸ẚ㍑ⓗ㧗䛔 㻶㼏 䛜ᐜ᫆䛻ᚓ䜙䜜䜛䛣䛸䛛䜙┒䜣䛻◊✲䛜⾜䜟䜜䛶䛝䛯䛜䚸ཎ⌮ⓗ䛻ప䛔↝⤖ᐦᗘ㻌 㻔⣙ 㻡㻜䠂㻕㻌 㻌 䛜䝁䝛䜽䝔䜱䝡䝔䜱ᢚไ䛾ཎᅉ䛷䛒䜛䛣䛸䛜᫂䜙䛛䛻䛺䛳䛶䛔䜛㼇㻝㼉䚹୍᪉䚸㼑㼤㻙㼟㼕㼠㼡 ἲ䛷䛿㧗ᐦᗘ䚸⤌⧊䛜ᆒ୍䛺䛹䛾䝯䝸䝑䝖䛜䛒䜛䛜䚸㼕㼚㻙㼟㼕㼠㼡 ἲ䜘䜚䜒⢏㛫⤖ྜ䛜ᙅ䛔䛣䛸䛜ၥ㢟䛷䛒䛳䛯䚹㻌ᮏ◊✲䛷䛿 㼑㼤㻙㼟㼕㼠㼡 ἲ 㻹㼓㻮㻞 ከ⤖ᬗయ䛾⤖ᬗ⢏㛫䛾⤖ྜ䜢ᨵၿ䛩䜛䛣䛸䜢┠ⓗ䛸䛧䚸⇕ฎ⌮᮲௳䜢⣔⤫ⓗ䛻ኚ䛘䛯ヨᩱ䜢స〇䛧䚸䛭䜜䜙䛾ᚤ⣽⤌⧊䚸㉸ఏᑟ≉ᛶ䛸䝁䝛䜽䝔䜱䝡䝔䜱䛾ホ౯䛛䜙 㼑㼤㻙㼟㼕㼠㼡 ἲ 㻹㼓㻮㻞 䝞䝹䜽䛾↝⤖ᶵᵓ䛸⮫⏺㟁ὶ≉ᛶ䛾㛵ಀ䜢⪃ᐹ䛧䛯䚹㻌㻞䠊ᐇ㦂᪉ἲ㻌㻹㼓㻌 㻔㻥㻥㻚㻢䠂䚸㻟㻞㻡㼙㼑㼟㼔㻕㻌 䛸 㻮㻌 㻔㻥㻥䠂䚸㻟㻜㻜㼙㼑㼟㼔㻕㻌 䛾ΰྜ⢊ᮎ䜢 㻺㼎 ⟶䛻ᑒධ䛧䚸▼ⱥ⟶䛻┿✵ᑒධᚋ䚸㻥㻜㻜䉝䛷 㻞㻌㼔 ↝ᡂ䛩䜛䛣䛸䛻䜘䜚 㻹㼓㻮㻞 䝞䝹䜽䜢స〇䛧䛯䚹ᚓ䜙䜜䛯䝞䝹䜽䜢⢊○ᚋ㻿㼁㻿㻟㻝㻢 ⟶䛻ධ䜜䚸୍㍈䝥䝺䝇䛻䜘䛳䛶୧➃䜢ᑒ䛨䜛䛸䛸䜒䛻䝔䞊䝥≧䛻ᡂᆺᚋ䚸▼ⱥ⟶䛻┿✵ᑒධ䛧䚸㻥㻜㻜䉝䛷 㻞㻠㻜㻌 㼔㻌 䜎䛷䛾ᵝ䚻䛺᫬㛫⇕ฎ⌮䜢⾜䛳䛯䚹㻿㼁㻿 ⟶䜢ྲྀ䜚㝖䛔䛶ᚓ䛯↝⤖య䝞䝹䜽ヨᩱ䛻䛴䛔䛶䚸㻿㻽㼁㻵㻰㻌 ☢᮰ィ䛻䜘䜛☢໬ ᐃ䛛䜙㉸ఏᑟ≉ᛶ䜢䚸㼄 ⥺ᅇᢡ㻌 㻔㼄㻾㻰㻕㻌 ᐃ䛻䜘䜚ᵓᡂ┦䜢䚸஺ὶᅄ➃Ꮚἲ䛻䜘䜚ᖖఏᑟ≧ែ䛾᢬ᢠ⋡䛸䝁䝛䜽䝔䜱䝡䝔䜱䜢ホ౯䛧䚸㻲㻱㻙㻿㻱㻹㻌 䛻䜘䜚ᚤ⣽⤌⧊ほᐹ䜢⾜䛳䛯䚹㻌㻟䠊⤖ᯝ䛸⪃ᐹ㻌 㻌㻲㼕㼓㻚㻌 㻝 䛻䚸↝ᡂ᫬㛫䛸඘ሸ⋡䛾㛵ಀ䜢♧䛩䚹䛺䛚䚸඘ሸ⋡䛿⌮ㄽᐦᗘ䛻ᑐ䛩䜛ヨᩱ䛾ᐦᗘ䛾๭ྜ䛸䛧䛯䚹↝ᡂ᫬㛫䜢㛗䛟䛩䜛䛣䛸䛻䜘䜚඘ሸ⋡䛿 㻡㻣䠂䛛䜙 㻣㻥䠂䜈ᨵၿ䛜䜏䜙䜜䛯䚹䛣䜜䛿䚸㻥㻜㻜䉝䛸䛔䛖㧗 䛷䛾↝ᡂ䛻䜘䜚↝⤖䛜㐍䜏䚸ከ⤖ᬗయෆ㒊䛾✵㝽䛜ῶᑡ䛧䛯䛣䛸䜢♧၀䛩䜛䚹㻌㻲㼕㼓㻚㻌 㻞 䛻䚸↝ᡂ᫬㛫䛸䝁䝛䜽䝔䜱䝡䝔䜱䚸㻞㻜㻌 㻷 䛻䛚䛡䜛 㻶㼏 䛾㛵ಀ䜢♧䛩䚹↝ᡂ᫬㛫䜢㛗䛟䛩䜛䛣䛸䛻䜘䜚䝁䝛䜽䝔䜱䝡䝔䜱䛜⣔⤫ⓗ䛻㧗䛟䛺䛳䛯䛣䛸䛛䜙䚸↝⤖䛜㐍䜏⤖ᬗ⢏㛫䛾⤖ྜ䛜ᨵၿ䛧䛯䛣䛸䛜♧၀䛥䜜䜛䚹䛸䛟䛻䚸㻠㻤㻌 㼔 ↝ᡂヨᩱ䛾䝁䝛䜽䝔䜱䝡䝔䜱䛿 㻝㻤䠂䛷䛒䜚䚸䛣䜜䛿 㼕㼚㻙㼟㼕㼠㼡 ἲ䛷స〇䛧䛯䝞䝹䜽ヨᩱ㻌㻔㻡䡚㻝㻡䠂㻕㻌 䛸ẚ㍑䛧䛶䜒㧗䛔䚹䜎䛯䚸↝⤖䛾㐍⾜䛻క䛔 㻶㼏 䜒ྥୖ䛧䚸᭱䜒 㻶㼏 䛾㧗䛛䛳䛯 㻠㻤㻌㼔 ↝ᡂヨᩱ䛿䚸㻟㻚㻜㽢㻝㻜㻡㻌㻭㻛㼏㼙㻞 䛸䛔䛖↓㓄ྥ䛾 㼑㼤㻙㼟㼕㼠㼡 ἲ䝞䝹䜽䛸䛧䛶䛿㧗䛔 㻶㼏 䜢グ㘓䛧䛯䚹㻌㻲㼕㼓㻚㻌㻟 䛻䚸ᮍ↝ᡂヨᩱ䚸㻞㻠㻌㼔 ↝ᡂヨᩱ䚸㻞㻠㻜㻌㼔 ↝ᡂヨᩱ䛾◊☻㠃䛾஧ḟ㟁Ꮚീ䜢♧䛩䚹⤖ᬗ⢏ྠኈ䛜⤖ྜ䛧䛶䛔䛺䛔ᮍ↝ᡂヨᩱ䛸ẚ㍑䛧䛶䚸㻞㻠㻌㼔䚸㻞㻠㻜㻌㼔 䛸↝ᡂ᫬㛫䛜㛗䛟䛺䜛䛸䛸䜒䛻䚸⤖ᬗ⢏㛫䛾⤖ྜ䛜ᙉ䛟䛺䛳䛶䛔䜛䛣䛸䛜☜ㄆ䛷䛝䛯䚹䛣䜜䛿 㻥㻜㻜䉝⛬ᗘ䛾㧗 䛷㛗᫬㛫⇕ฎ⌮䜢᪋䛩䛣䛸䛻䜘䜚㻹㼓㻮㻞 䛾⮬Ⓨⓗ䛺↝⤖䛜㐍䜏䚸㧗ᅽ䜢⏝䛔䛪䛻⢏㛫⤖ྜ䜢ᨵၿྍ⬟䛺䛣䛸䜢ព࿡䛩䜛䚹୍᪉䚸㻞㻠㻜㻌㼔 ↝ᡂヨᩱ䛻䛿 㻝㻜㻌P㼙 䜢㉸䛘䜛ᯈ≧䛾⤖ᬗ䛜ぢ䜙䜜䛯䛣䛸䛛䜙䚸䛣䛾ヨᩱ䛾 㻶㼏 䛜ప䛔ཎᅉ䛸䛧䛶䚸⤖ᬗ⢏䛾⢒኱໬䛻䜘䛳䛶⢏⏺䛾ᐦᗘ䛜పୗ䚸䛩䛺䜟䛱䝢䞁䝙䞁䜾ຊ䛜పୗ䛧䛯䛣䛸䛜⪃䛘䜙䜜䜛䚹㻌㻝㻚㻌 㻭㻚㻌㼅㼍㼙㼍㼙㼛㼠㼛㻘㻌㻶㻚㻌㻿㼔㼕㼙㼛㼥㼍㼙㼍㻘㻌㻷㻚㻌㻷㼕㼟㼔㼕㼛㻌㼍㼚㼐㻌㼀㻚㻌㻹㼍㼠㼟㼡㼟㼔㼕㼠㼍㻘㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㻚㻌㻿㼏㼕㻚㻌㼀㼑㼏㼔㼚㼛㼘㻚㻌㻞㻞㻜㻌㻔㻞㻜㻜㻣㻕㻌㻢㻡㻤㻙㻢㻢㻢㻚㻌

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㻌
㻌

㻲㼕㼓㻚㻌㻝㻚㻌㻿㼕㼚㼠㼑㼞㼕㼚㼓㻌㼠㼕㼙㼑㻌㼐㼑㼜㼑㼚㼐㼑㼚㼏㼑㻌㼛㼒㻌㼜㼍㼏㼗㼕㼚㼓㻌㼒㼍㼏㼠㼛㼞㻌㼒㼛㼞㻌㼑㼤㻙㼟㼕㼠㼡㻌㻹㼓㻮㻞㻌㼎㼡㼘㼗㼟㻌㼟㼕㼚㼠㼑㼞㼑㼐㻌㼍㼠㻌㻥㻜㻜䉝㻚㻌㻲㼕㼓㻚㻌㻞㻚㻌㻿㼕㼚㼠㼑㼞㼕㼚㼓㻌㼠㼕㼙㼑㻌㼐㼑㼜㼑㼚㼐㼑㼚㼏㼑㻌㼛㼒㻌㻶㼏㻌㻔㻞㻜㻌㻷㻘㻌㼟㼑㼘㼒㻙㼒㼕㼑㼘㼐㻕㻌㼍㼚㼐㻌㼏㼛㼚㼚㼑㼏㼠㼕㼢㼕㼠㼥㻌㼒㼛㼞㻌㼑㼤㻙㼟㼕㼠㼡㻌㻹㼓㻮㻞㻌㼎㼡㼘㼗㼟㻌㼟㼕㼚㼠㼑㼞㼑㼐㻌㼍㼠㻌㻥㻜㻜䉝㻚㻌㻲㼕㼓㻚㻌㻟㻚㻌㻿㻱㻹㻌㼕㼙㼍㼓㼑㼟㻌㼒㼛㼞㻌㼜㼛㼘㼕㼟㼔㼑㼐㻌㼟㼡㼞㼒㼍㼏㼑㻌㼛㼒㻌㻹㼓㻮㻞㻌㼎㼡㼘㼗㻌㼟㼍㼙㼜㼘㼑㼟㻧㻌㻔㼍㻘㼎㻕㻌㼎㼑㼒㼛㼞㼑㻌㼟㼕㼚㼠㼑㼞㼕㼚㼓㻘㻌㻔㼏㻘㼐㻕㻌㼟㼕㼚㼠㼑㼞㼑㼐㻌㼍㼠㻌㻥㻜㻜䉝㻌 㼒㼛㼞㻌㻞㻠㻌㼔㻌㼍㼚㼐㻌㻔㼑㻘㼒㻕㻌㼟㼕㼚㼠㼑㼞㼑㼐㻌㼍㼠㻌㻥㻜㻜䉝㻌 㼒㼛㼞㻌㻞㻠㻜㻌㼔㻚㻌― 85 ―

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MgB2 (2)㻹㼓㻮㻞 䝞䝹䜽㉸㟁ᑟయ䛾㛤Ⓨ㻌㼀㼔㼑㻌㼐㼑㼢㼑㼘㼛㼜㼙㼑㼚㼠㻌㼛㼒㻌㻹㼓㻮㻞㻌㼎㼡㼘㼗㼟㻌㻌ᐩ⏣㻌 ඃ㻘㻌 ▼ཎ㻌 ⠜㻌 䠄㕲㐨⥲◊䠅䠗㻌 ᒣᮏ㻌 ᫂ಖ㻘㻌 ‫‮‬ᮏ㻌 ⱥᏹ㻘㻌 ୗᒣ㻌 ῟୍㻘㻌 ᓊᑿ㻌 ග஧㻌 䠄ᮾ኱䠅㻌㼀㻻㻹㻵㼀㻭㻌㻹㼍㼟㼍㼞㼡㻘㻌㻵㻿㻴㻵㻴㻭㻾㻭㻌㻭㼠㼟㼡㼟㼔㼕㻌㻔㻾㼍㼕㼘㼣㼍㼥㻌㼀㼑㼏㼔㼚㼕㼏㼍㼘㻌㻾㼑㼟㼑㼍㼞㼏㼔㻌㻵㼚㼟㼠㼕㼠㼡㼠㼑㻕㻧㻌 㻌㼅㻭㻹㻭㻹㻻㼀㻻㻌㻭㼗㼕㼥㼍㼟㼡㻘㻌㼅㼁㻹㻻㼀㻻㻌㻴㼕㼐㼑㼔㼕㼞㼛㻘㻌㻿㻴㻵㻹㻻㼅㻭㻹㻭㻌㻶㼡㼚㻙㼕㼏㼔㼕㻘㻌㻷㻵㻿㻴㻵㻻㻌㻷㼛㼔㼖㼕㻌㻔㼁㼚㼕㼢㼑㼞㼟㼕㼠㼥㻌㼛㼒㻌㼀㼛㼗㼥㼛㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼠㼛㼙㼕㼠㼍㻬㼞㼠㼞㼕㻚㼛㼞㻚㼖㼜㻌㻌

Fig. 1. Photograph of a disk-shape MgB2 bulk/SUS composite(20/22 mmI, 5 mmt).
0.4
ZFC
FC
0.3

BT (T)

㻝䠊䛿䛨䜑䛻㻌
෭෾ᶵ෭༷䛻䜘䜛 㻞㻜㻙㻟㻜㻌㻷 䛷ᛂ⏝ྍ⬟䛺㉸㟁ᑟ䝞䝹䜽☢
▼䛸䛧䛶 㻹㼓㻮㻞 䝞䝹䜽య䜢᳨ウ䛧䛯䚹㔠ᒓ⣔㉸㟁ᑟయ䛸䛧䛶䛿᭱㧗䛾㌿⛣ ᗘ 㼀㼏䠄㻠㻜㻌㻷䠅䜢ᣢ䛴 㻹㼓㻮㻞㼇㻝㼉䛿䚸㉸㟁ᑟ䝁䝠䞊䝺䞁䝇㛗䛜㛗䛟㟁☢ⓗ␗᪉ᛶ䛜ప䛔䛣䛸䛛䜙䚸↓㓄ྥ䛾ከ⤖ᬗయ䛻䛚䛔䛶䜒 㻝㻜㻡㻌 㻭㻛㼏㼙㻞 ௨ୖ䛾ẚ㍑ⓗ㧗䛔⮫⏺㟁ὶᐦᗘ 㻶㼏䜢ᣢ䛴ᕧどⓗ㉸㟁ᑟ㟁ὶ䛜ᚓ䜙䜜䜛㼇㻞㼉䚹䛣䛾⤖ᬗ⢏㛫䛻䛚䛡䜛ᙅ⤖ྜ䛾୙ᅾ䛿䚸ከ⤖ᬗヨᩱ඲య䛻䜟䛯䛳䛶䛾ᆒ୍䛺㉸㟁ᑟ㟁ὶศᕸ䜢ྍ⬟䛸䛩䜛㼇㻟㼉䚹䜎䛯䚸㻹㼓㻮㻞 䝞䝹䜽య䛿䝬䜾䝛䝅䜴䝮䛸䝩䜴⣲䛾ΰྜ⢊ᮎ䛻⇕ฎ⌮䜢᪋䛩 㼕㼚㻙㼟㼕㼠㼡 ἲ䛺䛹䛻䜘䜚ẚ㍑ⓗᐜ᫆䛻䚸䛛䛴ప䝁䝇䝖䛷స〇ྍ⬟䛷䛒䜛䚹㻌㻹㼓㻮㻞 䛿⥺ᮦ໬◊✲䛜✚ᴟⓗ䛻⾜䜟䜜䛶䛔䜛䛜䚸ᙅ⤖ྜ䝣䝸䞊䛻⏤᮶䛩䜛≉ᚩ䛿 㻾㻱 ⣔⁐⼥จᅛ䝞䝹䜽䛷◊✲䛜㐍䜣䛷䛔䜛㉸㟁ᑟ䝞䝹䜽☢▼䛸䛧䛶䜒᭱㐺䛷䛒䜛䚹䛩䛺䜟䛱䚸㻠㻜㻌 㻷௨ୗ䛷ືసྍ⬟䛺ᙉຊ☢▼䛸䛧䛶䚸㍺㏦䞉་⒪➼䜈䛾ᛂ⏝䛜ᮇᚅ䛷䛝䚸䛸䛟䛻䚸㧗䛔☢ሙᆒ㉁ᛶ䛜ồ䜑䜙䜜䜛 㻹㻾㻵 䛺䛹䜈䛾ᛂ⏝䛻㐺䛩䜛䛸⪃䛘䜙䜜䜛䚹㻌᭱㏆ᡃ䚻䛿䜽䝷䝑䜽䛾↓䛔ᆒ୍䛺⤌⧊䜢ᣢ䛴 㻹㼓㻮㻞 䝞䝹䜽య䜢స〇䛩䜛ᢏ⾡䜢㛤Ⓨ䛧䚸ẚ㍑ⓗ኱ᆺ䛾䝞䝹䜽య䛾స〇䛜ྍ⬟䛸䛺䛳䛯䚹ᮏ◊✲䛷䛿䚸㻹㼓 䛸 㻮 䛾ΰྜ⢊ᮎ䛾ᅽ⢊ᡂᆺయ䜢⇕ฎ⌮䛩䜛䛣䛸䛻䜘䜚෇┙ᆺ 㻹㼓㻮㻞 䝞䝹䜽య䜢స〇䛧䚸䛭䛾ᤕᤊ☢ሙ≉ᛶ䜢ホ౯䛧䛯䚹㻌㻌㻞䠊ᐇ㦂᪉ἲ㻌㻹㼓㻌㻔㻥㻥㻚㻢䠂䚸㻟㻞㻡㼙㼑㼟㼔㻕㻌 䛸 㻮㻌㻔㻥㻥䠂䚸㻟㻜㻜㼙㼑㼟㼔㻕㻌 䛾ΰྜ⢊ᮎ䜢 㻝㻜㻌 㼙㼙䃥䜎䛯䛿 㻞㻜㻌 㼙㼙䃥䚸ཌ䛥 㻡㻌 㼙㼙 䛾෇┙ᙧ䛻ᡂᆺ䛧䚸⇕ฎ⌮䜢⾜䛖䛣䛸䛷 㻹㼓㻮㻞 䝞䝹䜽య䜢ᚓ䛯䚹୍㒊䛾䝞䝹䜽య䛻䛴䛔䛶䛿䚸ᶵᲔⓗᙉᗘ䜢㧗䜑䜛䛯䜑䛻 㻹㼓㻮㻞 䝞䝹䜽య㻛㔠ᒓ㻔㻿㼁㻿㻕」ྜయ䛸䛧䛯䚹㻌ᚓ䜙䜜䛯 㻹㼓㻮㻞 䝞䝹䜽య䜢䝦䝸䜴䝮෭෾ᶵ䛷 㻞㻜㻌㻷 ௨ୗ䜎䛷෭༷䛧䚸㉸㟁ᑟ䝬䜾䝛䝑䝖䜢⏝䛔䛶↓☢ሙୗ෭༷䠄㼆㻲㻯䠅䚸䜎䛯䛿☢ሙୗ෭༷䠄㻲㻯䠅᮲௳䛻䜘䜚 㻡㻌 㼀 䛾☢ሙୗ䛷╔☢䜢⾜䛳䛯䚹䝞䝹䜽య䛾ᤕᤊ☢ሙ≉ᛶ䛻㛵䛧䛶䛿䝞䝹䜽య⾲㠃䚸䛺䛔䛧୍ᐃ䜼䝱䝑䝥䜢䜒䛳䛶㓄⨨䛧䛯䝩䞊䝹⣲Ꮚ䜢⏝䛔䛶 ᐃ䛧䚸ᤕᤊ☢ሙ䛾 ᗘ౫Ꮡᛶ䚸᫬㛫౫Ꮡᛶ䛺䛹䜢ホ౯䛧䛯䚹䛺䛚䚸ヨᩱ ᗘ䛿䝞䝹䜽య䜢タ⨨䛧䛯෭෾ᶵ䝁䞊䝹䝗䝇䝔䞊䝆䛾ᗘ䛸䛧䛯䚹䜎䛯䚸䝞䝹䜽య䛛䜙ษ䜚ฟ䛧䛯ヨᩱ∦䛻ᑐ䛧䛶䚸㻿㻽㼁㻵㻰 ☢᮰ィ䛻䜘䜚☢໬ ᐃ䜢⾜䛳䛯䚹㻌㻌㻟䠊⤖ᯝ䛸⪃ᐹ㻌 㻌㻞㻜㻛㻞㻞㻌㼙㼙䃥䛾 㻹㼓㻮㻞 䝞䝹䜽㻛㻿㼁㻿 」ྜయ䛾እほ䜢 㻲㼕㼓㻚㻌㻝 䛻♧䛩䚹ගᏛ㢧ᚤ㙾䛷䛿䝬䜽䝻䝇䜿䞊䝹䛾䜽䝷䝑䜽䚸䝪䜲䝗➼䛿䜏䜙䜜䛪ᆒ୍䛺⤌⧊䛜ほᐹ䛥䜜䛯䚹䝞䝹䜽య䛛䜙ษ䜚ฟ䛧䛯ヨᩱ䛾☢໬≉ᛶ䜢ㄪ䜉䛯䛸䛣䜝䚸㼀㼏 䛿⣙ 㻟㻥㻌㻷 䛷䛒䜚䚸㻶㼏 䛿 㻟㻜㻌㻷 䛻䛚䛔䛶 㻝㽢㻝㻜㻡㻌㻭㻛㼏㼙㻞 ௨ୖ䛷䛒䛳䛯䚹㻌㻝㻜㻌 䡉䡉䃥䝞䝹䜽య䛻䛴䛔䛶 㼆㻲㻯 ཬ䜃 㻲㻯 ᮲௳䛷 㻡㻌㼀 䛾☢
ሙୗ䛷╔☢ᚋ䚸䝞䝹䜽య⾲㠃୰ᚰ䛾┤ୖ 㻡㻌 㼙㼙 䛾఩⨨䛻䛚䛔䛶 ᐃ䛧䛯ᤕᤊ☢ሙ䛾䝇䝔䞊䝆 ᗘ౫Ꮡᛶ䜢 㻲㼕㼓㻚㻌 㻞 䛻♧䛩䚹㼆㻲㻯㻘㻌㻲㻯 䛔䛪䜜䛾╔☢᮲௳ୗ䛷䜒䚸䝇䝔䞊䝆 ᗘ䛜 㻝㻟㻌㻷䛻䛚䛔䛶 㻜㻚㻞㻡㻌 㼀 䜢㉸䛘䜛ᤕᤊ☢ሙ䛜ᚓ䜙䜜䛯䚹䜎䛯䚸䝞䝹䜽ᚄ䛾䜘䜚኱䛝䛺 㻞㻜㻌 㼙㼙䃥䝞䝹䜽య䛻䛴䛔䛶ᤕᤊ☢ሙ䜢 ᐃ䛧䛯䛸䛣䜝䚸㻝㻟㻌㻷 䛻䛚䛔䛶ヨᩱ⾲㠃䛷⣙ 㻝㻚㻡㻌㼀 䛾ᤕᤊ☢ሙ䛜ᚓ
䜙䜜䛯䚹㻌

0.2

0.1
t

10 mm I x 5 mm MgB 2 bulk
zgap = 5 mm
0

0

10

20

30

40

TC.S. (K)Fig. 2. Trapped field as a function of cold-stage temperature fora MgB2 bulk with 10 mmI5 mmt. The bulk was field-cooled(FC) in 5 T to 13 K or zero-field-cooled (ZFC) to 13 K followedby an application of 5 T. Trapped field of the bulk was masured
after removal of the external field by a hall-sensor which locates
5 mm over the center of the bulk surface.
㻠䠊⤖ㄽ㻌㻹㼓㻮㻞 䝞䝹䜽య䜢స〇䛧䚸㉸㟁ᑟ䝞䝹䜽☢▼䛸䛧䛶䛾ྍ⬟ᛶ䜢᳨ウ䛧䛯䚹㻞㻜㻌㼙㼙䃥㻹㼓㻮㻞 䝞䝹䜽య䛻䛚䛔䛶⣙ 㻝㻚㻡㻌㼀 䛾ᤕᤊ☢ሙ㻔䝇䝔䞊䝆 ᗘ 㻝㻟㻌㻷㻕䛜ᚓ䜙䜜䛯䚹䝞䝹䜽య䛾⮫⏺㟁ὶᐦᗘ䚸ᚤ⣽⤌⧊䛾ᨵၿ䛻䜘䜚ᤕᤊ☢ሙ䛾ྥୖ䛿ྍ⬟䛷䚸㻹㼓㻮㻞 䝞䝹䜽య䛿ᩘ䝔䝇䝷⣭䛾ᙉຊ㉸㟁ᑟ䝞䝹䜽☢▼ೃ⿵䛸䛧䛶᭷ᮃ䛷䛒䜛䛸䛔䛘䜛䚹㻌㻌ཧ⪃ᩥ⊩㻌
[1] J. Nagamatsu, N. Nakagawa, T. Muranaka, Y. Zenitani andJ. Akimitsu, Nature 410, 63 (2001).
[2] D. C. Larbalestier et al., Nature 410, 186 (2001).
[3] ᒣᮏ᫂ಖ, 䜰䝺䜽䝃䞁䝎䞊䞉䜾䝺䝡䝑䝏, 䝕䝡䝑䝗䞉䝷䝞䝺䝇䝔䜱䜶, ୗᒣ῟୍, ᓊᑿග஧, ᛂ⏝≀⌮ 79, 48 (2010).

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MgB2 (2)MgB2Relation between hot pressing condition and curitical current density in MgB2 bulks()
YAMAMOTO Yoshiaki , IKEDA Hiroshi (University of Tsukuba)
E-mail: ikeda@bk.tsukuba.ac.jp
1.Introduction
MgB2(Tc =39K)

Hc2
20K

NbTi
Nb3 Sn
(Jc )
MgB2

HP
[1][2]

700kg/cm2
HP
Jc

400kg/cm2
Hc2
Hirr

HP
Hirr
0.5T

Jc

(HP)

Jc
MgB2
200

non HP
Hirr
700kg/cm2
HP
20K

650

HP

750

HP
HP

Jc

2.Experimental
Mg
MgB2
Jc

B

in-situ PICT

690

MgB2
( Ha )
200 700kg/cm2(HP)HP
650 750
PPMS(Physical Property Measurement System)
MPMS(Magnetization Property
Measurement System)
X
HP
Jc
3.ResultsandDiscussion
Fig.1
750
HP
Jc (20K, 2T) (100)Fig.1(a)HP

400kg/cm2

400kg/cm2

HP

Jc

FWHM of the (100)peak and Jc under 2T at 20K for
MgB2 bulks.

HP
non HP(40K)
HP

Fig. 1: HP Puressure dependence of the density, the101μcm
(40K)
HP

40K

27μ cm

Fig.1(b)Jc (20K, 2T)
non HP3
400kg/cm2

Fig. 2: Temperature dependence ofHc2 and Hirr for
MgB2 bulks.

XRD
400kg/cm2
HP

Fig.2

Hc2

Hirr

[1] K. Shinohara, T.Futatumori and H.Ikeda.,Physica
C, 468 (2008) p.1369-1371.
[2] A. Matsumoto, et al.:Abstracts of CSJ
Conference,Vol.81(2009)p.223― 87 ―

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2010年度秋季低温工学・超電導学会

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MgB2 (2)㻹㼓 㔠ᒓ⟶䜢⏝䛔䛯እ㒊ᣑᩓἲ 㻹㼓㻮㻞 ⥺ᮦ䛾⤌⧊䛸㉸ఏᑟ≉ᛶ㻌㻿㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼍㼚㼐㻌㼟㼠㼞㼡㼏㼠㼡㼞㼑㼟㻌㼛㼒㻌㻹㼓㻮㻞㻌㼣㼕㼞㼑㼟㻌㼜㼞㼑㼜㼍㼞㼑㼐㻌㼎㼥㻌㼑㼤㼠㼑㼞㼚㼍㼘㻌㼐㼕㼒㼒㼡㼟㼕㼛㼚㻌㼜㼞㼛㼏㼑㼟㼟㻌㼡㼟㼕㼚㼓㻌㻹㼓㻌㼠㼡㼎㼑㻌㻌㔠⃝㻌 ᫀဢ㻘㻌 ኱㔝㻌 㧗ᘯ㻘㻌 ᑠ➟ཎ㻌 ඾ᏹ㻘㻌 ᒣ⏣㻌 ㇏㻘㻌 ኴยᕝ㻌 ᜤ἞䠄ᮾᾏ኱䠅䠗㻌⇃಴㻌 ᾈ᫂㻘㻌 ᯇᮏ㻌 ᫂ၿ䠄㻺㻵㻹㻿䠅㻌㻷㻭㻺㻭㼆㻭㼃㻭㻌㻹㼍㼟㼍㼥㼍㻘㻌㻻㻴㻺㻻㻌㼀㼍㼗㼍㼔㼕㼞㼛㻘㻌㻻㻳㻭㻿㻭㼃㻭㻾㻭㻌㻺㼛㼞㼕㼔㼕㼞㼛㻘㻌㼅㻭㻹㻭㻰㻭㻌㼅㼡㼠㼍㼗㼍㻘㻌㼀㻭㻯㻴㻵㻷㻭㼃㻭㻌㻷㼥㼛㼖㼕㻌㻔㼀㼛㼗㼍㼕㻌㼁㼚㼕㼢㼑㼞㼟㼕㼠㼥㻕㻧㻌㻷㼁㻹㻭㻷㼁㻾㻭㻌㻴㼕㼞㼛㼍㼗㼕㻘㻌㻹㻭㼀㻿㼁㻹㻻㼀㻻㻌㻭㼗㼕㼥㼛㼟㼔㼕㻌㻔㻺㻵㻹㻿㻕㻌㻱㻙㼙㼍㼕㼘㻌㻦㼝㼥㼥㼝㼞㻞㻣㻟㻬㼥㼎㼎㻚㼚㼑㻚㼖㼜㻌㻌㻝䠊㻌 䛿䛨䜑䛻㻌 Mg 㔠ᒓ࡜ B ⢊ᮎ࡜ࡢᣑᩓ཯ᛂ࡟ࡼࡾྜᡂࡉࢀࡿ MgB2
䛿䚸✵Ꮝ䛾ᑡ䛺䛔⦓ᐦ䛺⤌⧊䜢࿊䛧䛶䛚䜚䚸㧗䛔⮫⏺㟁ὶᐦᗘ䛜ᮇᚅ䛥䜜䜛䚹ᮏ◊✲䛷䛿䚸Mg ⟶䛾ෆഃ䛻 B ⢊ᮎ䜢඘ሸ䛩䜛እ㒊ᣑᩓἲ䛻䜘䜚స〇䛧䛯 MgB2 ୸⥺䛾⤌⧊䛸㉸ఏᑟ≉ᛶ䛻䛴䛔䛶ሗ࿌䛩䜛䚹ඛ䛾◊✲䛷䛿ᮦᩱ䛾ຍᕤ䛻⁁䝻䞊䝹䜢⏝䛔䛯䛯䜑䚸Mg ⟶䛜ᅄゅ䛟ຍᕤ䛥䜜䚸⇕ฎ⌮ᚋᅄ㝮䛻ᮍ཯ᛂ䛾 Mg 䛜ከ䛟ṧ␃䛩䜛䛣䛸䛜ぢ䜙䜜䛾䛷䚸ᮏᐇ㦂䛷䛿⁁䝻䞊䝹䜢⾜䜟䛪඲䛶෇ᙧ䝎䜲䝇䜢⏝䛔䛯ᘬ䛝ᢤ䛝ຍᕤ䜢⾜䛳䛯䚹㻞䠊㻌ᐇ㦂᪉ἲ㻌 Fig. 1 䛻እ㒊ᣑᩓἲ䛻䜘䜛 MgB2 ⥺ᮦ䛾ヨᩱస〇᪉ἲ䜢♧䛩䚹እᚄ/ෆᚄ䛜 12/6 mmĳ 䛾⣧㕲⟶䛻䚸እᚄ/ෆᚄ䠖6.0/3.5䡚
4.0 mmĳ 䛾 Mg 㔠ᒓ⟶䜢ᤄධᚋ䚸5 mol%䛾 SiC ⢊ᮎ䜢ῧຍ䛧䛯䜰䝰䝹䝣䜯䝇 B ⢊ᮎ䜢඘ሸ䛧䚸෭㛫䛷⥺ᘬ䛝䛧䛶┤ᚄ 1.0䡚Fig. 1 Preparation procedure of MgB2 wires by external
diffusion process using Mg tube.

0.8 mmĳ 䛾୸⥺ᮦ䜢స〇䛧䛯䚹630䉝×5 h䚸Ar 㞺ᅖẼ୰䛷⇕ฎ⌮䜢⾜䛔䚸୍㒊䛾ヨᩱ䛻䛚䛔䛶⇕ฎ⌮䛾ᚋ༙ 30 min䚸10
MPa 䛾䝩䝑䝖䝥䝺䝇ฎ⌮䜢⾜䛳䛯䚹4.2 K 䛻䛚䛡䜛⮫⏺㟁ὶ
䠄Ic䠅䛾☢ሙ౫Ꮡᛶ䛻䛴䛔䛶䛿≀㉁䞉ᮦᩱ◊✲ᶵᵓ䠄NIMS䠅䛻䛚䛔䛶 ᐃ䛧䛯䚹
㻟䠊㻌ᐇ㦂⤖ᯝ䛚䜘䜃⪃ᐹ㻌
Fig. 2 䛻䚸Mg 㔠ᒓ⟶እᚄ/ෆᚄ䠖6.0/4.0 mmĳ 䛾ヨᩱ䜢෭㛫ᘬ䛝ᢤ䛝ຍᕤ䛻䜘䜚స〇䛧䛯䚸⥺ᮦ┤ᚄ 0.8 mmĳ ヨᩱ䛾ᶓ᩿㠃ගᏛ㢧ᚤ㙾෗┿䜢♧䛩䚹๓ሗ䛷䛿⁁䝻䞊䝹ຍᕤ䛻䜘䜚䚸

Fig. 2 Macrostructures of cross sections in MgB2 wires of 0.8
mmĳ in diameter. (a) as drawn, (b) heat-treated at 630䉝 for 5 h.

104

Mg 㔠ᒓ⟶䛜ᅄゅ䛟ຍᕤ䛥䜜䚸ᅄ㝮䛻 Mg 䛜ṧ␃䛧䛶䛔䛯䛜䚸Mg 6/3.5 1.0 mmȭ
Mg 6/4.0 1.0 mmȭ
Mg 6/3.5 0.8 mmȭ
Mg 6/4.0 0.8 mmȭᮏሗ䛷䛿඲䛶ᘬ䛝ᢤ䛝䛷䛾ຍᕤ䜢⾜䛖䛣䛸䛷䜋䜌ᆒ୍䛻 Mg
ኸ䛻ᣑᩓ཯ᛂ䛻䜘䜚⏕ᡂ䛧䛯 MgB2 䛜䛒䜚䚸䛭䛾࿘䜚䛻䛿 Mg
䛾ᣑᩓ䛻䜘䜚䚸✵Ꮝ䛜⏕䛨䛶䛔䜛䛣䛸䛜䜟䛛䜛䚹MgB2 䝁䜰䛻䛚䛡䜛 Mg 䛸 B 䛾 EPMA ศᯒ䛻䜘䜛䛸䚸MgB2 䝁䜰୰ኸ㒊䛸እ࿘㒊䛸䛾ᕪ䛿䜋䛸䜣䛹ぢ䜙䜜䛪䚸Mg䠖B䠙1䠖2.5䡚2.2 䛸䜔䜔 B
rich 䛷䛒䜛䛜䚸๓ሗ䛻ẚ䜉䛶໬Ꮫ㔞ㄽẚ䛻㏆䛔್䛸䛺䛳䛯䚹

Jc (A/mm2)㔠ᒓ⟶䛜୸䛟ຍᕤ䛥䜜䛯䚹䠄b䠅䛾⇕ฎ⌮ᚋ䛾෗┿䜢ぢ䜛䛸䚸୰Heat-treated

103

4.2K

102

㻌 Fig. 3 䛻 4.2 K 䛻䛚䛡䜛⮫⏺㟁ὶᐦᗘ䠄JC䠅䛾☢ሙ౫Ꮡᛶ䜢♧䛩䚹Mg 㔠ᒓ⟶䚸እᚄ/ෆᚄ䠖6.0/3.5䚸6.0/4.0 mmĳ 䛸䜒䛻⥺4

ᗘ JC ್䛜㧗䛟䛺䛳䛯䚹10 T 䛻䛚䛡䜛 JC ್䛿 420 A/mm 䠄IC䠙

7 8 9 10 11 12 13
Magnetic Field (T)21 A䠅䚸5 T 䛻䛚䛡䜛 JC ್䛿 3700 A/mm2䠄IC䠙187 A䠅䛸䛔䛪䜜

Fig. 3 Magnetic field dependence of JC at 4.2 K for the MgB2

䜒㧗䛔್䜢♧䛧䛯䚹wires heat-treated at 630䉝 for 5 h.

ᮦ┤ᚄ 0.8 mmĳ 䛾ヨᩱ䛾᪉䛜䚸5䡚12 T 䛭䜜䛮䜜䛷⣙ 2 ಸ⛬
2― 88 ―

5

6

第83回

2010年度秋季低温工学・超電導学会

1D-p05

MgB2 (2)㻹㼓 ᣑᩓἲ䛻䜘䜚స〇䛧䛯 㻹㼓㻮㻞 ⥺ᮦ䛾⤌⧊䛸㉸ఏᑟ≉ᛶ㻌㼀㼔㼑㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕䡊㼓㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼍㼚㼐㻌㼙㼕㼏㼞㼛㼟㼠㼞㼡㼏㼠㼡㼞㼑㻌㼛㼒㻌㻹㼓㻮㻞㻌㼠㼍㼜㼑㼟㻌㼒㼍㼎㼞㼕㼏㼍㼠㼑㼐㻌 㻌㼎㼥㻌㻹㼓㻌㼐㼕㼒㼒㼡㼟㼕㼛㼚㻌㼜㼞㼛㼏㼑㼟㼟㻌⇃಴㻌 ᾈ᫂䚸ᯇᮏ㻌 ᫂ၿ䚸ᡞྔ୍ṇ䚸࿴⏣㻌 ோ㻔≀ᮦᶵᵓ㻕䚸チ㻌 Ꮚⴙ䚸ᮌᮧ㻌 ⸅㻔ᮾ኱㻕㻌㻷㼁㻹㻭㻷㼁㻾㻭㻌㻴㼕㼞㼛㼍㼗㼕㻘㻌㻹㻭㼀㻿㼁㻹㻻㼀㻻㻌㻭㼗㼕㼥㼛㼟㼔㼕䠈㼀㻻㻳㻭㻺㻻㻌㻷㼍㼦㼡㼙㼍㼟㼍㻘㻌 㼃㻭㻰㻭㻌㻴㼕㼠㼛㼟㼔㼕㻔㻺㻵㻹㻿㻕㻘㻌㻴㼁㻾㻌㻶㼍㼔㼙㼍㼔㼚㻘㻌㻷㻵㻹㼁㻾㻭㻌㻷㼍㼛㼞㼡㻔㼀㼛㼗㼥㼛㻌㼁㼚㼕㼢㻚㻕㻌 㻌㻱㻙㼙㼍㼕㼘㻦㻌㻷㼁㻹㻭㻷㼁㻾㻭㻚㻴㼕㼞㼛㼍㼗㼕㻬㼚㼕㼙㼟㻚㼓㼛㻚㼖㼜㻌࠙ㅖゝࠚ MgB2 ⥺ᮦࡢస〇ἲ࡜ࡋ࡚ࡣࠊཎᩱࡢΰྜ⢊ᮎࢆ㔠ᒓ⟶࡟඘ሸࡋ࡚ຍᕤ࣭⇕ฎ⌮ࢆࡍࡿࠊ࠸ࢃࡺࡿࣃ࢘ࢲ
࣮࣭࢖࣭ࣥࢳ࣮ࣗࣈἲ㸦PIT㸧ἲࡀ୍⯡ⓗ࡛࠶ࡿࡀࠊPIT
ἲ࡛ࡣ MgB2 ࢥ࢔ࡢ඘ሸ⋡ࡀ࠿࡞ࡾప࠸ࡓࡵ࡟ࠊ㧗࠸⮫⏺
㟁ὶᐦᗘ Jc ࢆᚓࡿࡇ࡜ࡀᅔ㞴࡛࠶ࡿࠋࡑࡇ࡛ᡃࠎࡣ Mg
ࢆ B ᒙࡢእ㒊࠿ࡽᣑᩓ࡟ࡼࡗ࡚౪⤥ࡍࡿ᪉ἲ࡟ࡼࡾ
MgB2 ⥺ᮦࢆస〇ࡋࠊ㧗࠸ Jc ≉ᛶࢆᚓࡿࡇ࡜࡟ᡂຌࡋ࡚࠸
ࡿࠋᮏ◊✲࡛ࡣࠊࡇࡢ Mg ᣑᩓἲ࡟ࡼࡗ࡚༢ⰺࠊ7 ⰺ࡞ࡽࡧ࡟ 19 ⰺࡢ୸⥺ᮦࢆస〇ࡋࠊ⥺ᮦࡢ⤌⧊࡜⮫⏺㟁ὶ≉ᛶࢆㄪ࡭ࡓࠋ࠙ᐇ㦂᪉ἲࠚ ෆᚄ 3.5mmࠊእᚄ 6mm ࡢ Ta ⟶ࡢ୰ᚰ࡟
ᚄ 2mm ࡢ⣧ Mg Წࢆ㓄⨨ࡋࠊTa ⟶࡜ Mg Წ࡜ࡢ㝽㛫࡟
B(+SiC)ΰྜ⢊ᮎࢆ඘ሸࡋࡓᚋࠊ⁁࣮ࣟࣝ࡞ࡽࡧ࡟࣮ࣟࣛ
࣮ࢲ࢖ࢫ࡟ࡼࡾᚄ 1.3mm ࡢ࣡࢖࣮ࣖ࡟ຍᕤࡋࡓࠋࡲࡓࠊ
ࡇࡢ࣡࢖࣮ࣖࢆ 7 ᮏࡲࡓࡣ 19 ᮏ᮰ࡡ࡚ࡉࡽ࡟ Cu-Ni ⟶࡟ᤄධࡋࠊᚄ 1.3mm ࡢ 7 ⰺ࠶ࡿ࠸ࡣ 19 ⰺࡢ࣡࢖࣮ࣖ࡟ຍ
ᕤࡋࡓࠋࡇࢀࡽࡢ⥺ᮦ࠿ࡽ㛗ࡉࡀ 50mm ࡢ▷ᑻ⥺ᮦࢆษ
ࡾฟࡋࠊ600-800oC ࡛ 15 ศ࠿ࡽ 10 ᫬㛫⇕ฎ⌮ࡋࡓࠋࡇࢀࡽࡢ⥺ᮦࡢ⤌⧊ࢆㄪ࡭ࡿ࡜ඹ࡟ MgB2 ཯ᛂᒙࡢ Vickers◳ࡉࢆ ᐃࡋࡓࠋࡲࡓ✀ࠎࡢ ᗘࠊ☢⏺୰࡛⮫⏺㟁ὶ Ic
ࢆ ᐃࡋࡓࠋ
࠙⤖ᯝࠚ ཯ᛂᒙ࠶ࡓࡾࡢ Jc ࢆ᭱㧗࡟ࡍࡿ⇕ฎ⌮ ᗘࡣ
640oC ㏆ഐ࡛࠶ࡾࠊࡲࡓ᭱㐺⇕ฎ⌮᫬㛫ࡣ 1 ᫬㛫⛬ᗘ࡛࠶ࡿࠋ⇕ฎ⌮ ᗘࡀ Mg ࡢ⼥Ⅼ࡛࠶ࡿ 650oC ࢆ㉺࠼ࡿ࡜ Ic
ࡢ෌⌧ᛶࡀᝏࡃ࡞ࡿࡀࠊࡇࢀࡣ Mg ࢥ࢔ࡢ⼥ゎࡀ㉳ࡇࡿ࡜Mg ࡢ⾲㠃ᙇຊ࡟ࡼࡗ࡚⥺ᮦ㛗ᡭ᪉ἲࡢ Mg ࡢศᕸࡀ୙ᆒ
୍࡟࡞ࡿࡓࡵ࡜⪃࠼ࡽࢀࡿࠋ640oC ࡛ 1 ᫬㛫 ⇕ฎ⌮ࡋࡓ⥺ᮦࡣࠊ࠸ࡎࢀࡶ 105A/cm2 ࡟㏆࠸ Jc ್ࢆ♧ࡍࡀࠊIc ࡣከⰺ⥺ᮦࡢ᪉ࡀ༢ⰺ⥺ᮦࡼࡾࡶ㧗࠸ࠋᅗ㸯࡟ 10mol%ࡢ SiC ࢆῧຍࡋࠊ640oC ࡛ 1 ᫬㛫⇕ฎ⌮ࡋࡓ Ta ࢩ࣮ࢫ༢ⰺ⥺ᮦࠊ7 ⰺ⥺ᮦࠊ࡞ࡽࡧ࡟ 19 ⰺ⥺ᮦࡢ᩿㠃ࡢගᏛ㢧ᚤ㙾෗┿ࢆ♧ࡍࠋ༢ⰺ⥺ᮦ࡛ࡣ B ࡢ඘ሸᒙࡀ Mg ࡢᣑᩓ㊥㞳࡟ẚ࡭࡚ࡣࡿ࠿࡟ཌ࠸ࡓࡵ࡟ࠊMg ࢥ࢔㏆ഐࡢ B ᒙࡋ࠿ Mg ࡜཯ᛂࡋ࡚࠾ࡽࡎࠊእഃࡢ B ᒙࡣᮍ཯ᛂࡢࡲࡲ࡛࠶ࡿࠋ7 ⰺ⥺ᮦ࡟࠾࠸࡚ࡣࠊB ᒙࡢཌࡉࡀ
༢ⰺ⥺ᮦ࡟ẚ࡭࡚ࡣࡿ࠿࡟ⷧ࠸ࡓࡵ࡟኱㒊ศࡢ B ᒙࡣ Mg
࡜཯ᛂࡋ࡚ MgB2 ࡀ⏕ᡂࡋ࡚࠸ࡿࡀࠊ୍㒊࡟ࡲࡔᮍ཯ᛂࡢ
B ࡀṧ␃ࡋ࡚࠸ࡿࠋ19 ⰺ⥺ᮦ࡛ࡣࠊB ᒙཌࡀࡉࡽ࡟ⷧࡃ
࡞ࡾࠊB ᒙࡣ᏶඲࡟ Mg ࡜཯ᛂࡋ࡚ MgB2 ࡜࡞ࡗ࡚࠸ࡿࠋ
༢ⰺ⥺ᮦ࡟࠾࠸࡚ࡣ⇕ฎ⌮ ᗘࢆୖࡆࡓࡾࠊ⇕ฎ⌮᫬㛫ࢆ㛗ࡃࡍࡿ࡜཯ᛂ┦ࡢཌࡳࡣቑ኱ࡍࡿࡀࠊ⤖ᬗ⢏ࡢ⢒኱໬ࡀ㉳ࡁ࡚཯ᛂᒙᙜࡾࡢ Jc ≉ᛶࡣపୗࡋ࡚ࡋࡲ࠺ࠋࡍ࡞ࢃࡕࠊ
640oC ࡜࠸࠺ẚ㍑ⓗప ࡢ ᗘ࡛▷᫬㛫⇕ฎ⌮ࡍࡿࡢࡀ㧗࠸཯ᛂᒙ࠶ࡓࡾࡢ Jc ࢆᚓࡿࡓࡵ࡟᭷ຠ࡛࠶ࡾࠊ⥺ᮦࡢ㟁ὶᐜ㔞࡛࠶ࡿ Ic ࢆୖࡆࡿࡓࡵ࡟ࡣࠊMg ࢥ࢔࡜ B ᒙ࡜ࡢ⏺㠃ࡢ㠃✚ࢆቑ኱ࡉࡏ࡚⏕ᡂࡍࡿ MgB2 ໬ྜ≀ࡢ㔞ࢆቑ኱ࡉࡏࡿࡢࡀ᭷ຠ࡛࠶ࡿࠋࡇࡢࡓࡵ࡟ࠊ༢ⰺ⥺ᮦࡼࡾࡶከ
ⰺ⥺ᮦࡢ᪉ࡀ㧗࠸ Ic ࢆ♧ࡍࠋ
MgB2 ཯ᛂᒙࡢ Vickers ◳ࡉࡣ⇕ฎ⌮ ᗘ࡜࡜ࡶ࡟ୖ᪼
ࡍࡿࡀࠊ640oC ࡛ࡣ⣙ 1300 ࡜࡞ࡗࡓࠋࡇࢀࡣ㏻ᖖࡢ PIT

ἲ⥺ᮦࡢ್࡛࠶ࡿ~400 ࡼࡾࡶࡣࡿ࠿࡟㧗ࡃࠊ㧗ᅽྜᡂࡋࡓ඘ሸ⋡ 100%ࡢࣂࣝࢡᮦࡢ್࡛࠶ࡿ~1700 ࡟㏆࠸ࠋࡇࢀࡼࡾ Mg ᣑᩓἲ࡛ࡣ༑ศ࡟⦓ᐦ࡞ MgB2 ᒙࡀᙧᡂࡉࢀ࡚࠸
ࡿ࡜⪃࠼ࡽࢀࡿࠋ

100Pm

Mono-filament wire

7-filament wire

19-filament wire

Fig. 1 Optical microscope images of the cross sectionsof mono-filament, 7-filament and 19-filament wires
fabricated with Mg diffusion process. Heat treatment
condition: 640oC1hr.

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MgB2 (2)ෆ㒊 㻹㼓 ᣑᩓ 㻹㼓㻮㻞 ⥺ᮦ䛾䝬䜽䝻⤌⧊䛻ཬ䜌䛩⇕ฎ⌮᮲௳䛾ᙳ㡪㻌㻵㼚㼒㼘㼡㼑㼚㼏㼑㼟㻌㼛㼒㻌㼔㼑㼍㼠㻌㼠㼞㼑㼍㼠㼙㼑㼚㼠㻌㼏㼛㼚㼐㼕㼠㼕㼛㼚㼟㻌㼛㼚㻌㼙㼍㼏㼞㼛㼟㼠㼞㼡㼏㼠㼡㼞㼑㻌㼕㼚㻌㻹㼓㻮㻞㻌㼣㼕㼞㼑㼟㻌 㻌㼜㼞㼑㼜㼍㼞㼑㼐㻌㼎㼥㻌㼍㼚㻌㼕㼚㼠㼑㼞㼚㼍㼘㻌㻹㼓㻌㼐㼕㼒㼒㼡㼟㼕㼛㼚㻌㼙㼑㼠㼔㼛㼐㻌ᔱ⏣㻌 㞝௓䠈ஂಖ⏣㻌 㞝㈗㻘㻌 Ἴከ㻌 ⫄㻘㻌 ụ⏣㻌 ㈼୍㻘㻌 ୰ᓥ㻌 ⱥ἞䠄஑ᕞ኱Ꮫ䠅䠗㻌ᯇᮏ㻌 ᫂ၿ㻘㻌 ᡞྔ㻌 ୍ṇ㻘㻌 ⇃಴㻌 ᾈ᫂䠄㻺㻵㻹㻿䠅㻌㻿㻴㻵㻹㻭㻰㻭㻌㼅㼡㼟㼡㼗㼑䠈㻌 㻷㼁㻮㻻㼀㻭㻌㼅㼡㼗㼕㻘㻌㻴㻭㼀㻭㻌㻿㼍㼠㼛㼟㼔㼕㻘㻌㻵㻷㻱㻰㻭㻌㻷㼑㼚㻙㼕㼏㼔㼕㻘㻌㻺㻭㻷㻭㻿㻴㻵㻹㻭㻌㻴㼕㼐㼑㼔㼍㼞㼡㻌㻔㻷㼥㼡㼟㼔㼡㻌㼁㼚㼕㼢㼑㼞㼟㼕㼠㼥㻕㻧㻌㻹㻭㼀㻿㼁㻹㻻㼀㻻㻌㻭㼗㼕㼥㼛㼟㼔㼕㻘㻌㼀㻻㻳㻭㻺㻻㻌㻷㼍㼦㼡㼙㼍㼟㼍㻘㻌㻷㼁㻹㻭㻷㼁㻾㻭㻌㻴㼕㼞㼛㼍㼗㼕㻌㻔㻺㻵㻹㻿㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼚㼗㻙㼥㻙㼟㼔㼕㼙㼍㼐㼍㻬㼙㼙㼟㻚㼗㼥㼡㼟㼔㼡㻙㼡㻚㼍㼏㻚㼖㼜㻌㻌㻌㻝䠊䛿䛨䜑䛻㻌
⅔ෆ䛷ୗഃ䛻఩⨨䛩䜛㡿ᇦ䛻⁐䛡䛯 Mg 䛜ὶ䜜㎸䜏䚸⤖ᯝ䛸
MgB2 ㉸ఏᑟయ䛾ၥ㢟Ⅼ䛸䛧䛶䚸☢ሙ୰䛻䛚䛔䛶⮫⏺㟁䛧䛶 MgB2 䛾୙ᆒ୍䛺ศᕸ䜢䜒䛯䜙䛧䛶䛔䜛ྍ⬟ᛶ䛜䛒䜛䚹ὶᐦᗘ䠄Jc䠅䛜኱䛝䛟పୗ䛩䜛䛣䛸䛜ᣲ䛢䜙䜜䜛䚹᭱㏆㛤Ⓨ䛥䜜䛔䛪䜜䛾ヨᩱ䛻䛚䛔䛶䜒䚸㟁Ẽⓗ⤖ྜᗘ䛾పୗ䛾せᅉ䛸䛺䜚ᚓ䜛䜽䝷䝑䜽䛜⥺ᘬ䛝᪉ྥ䛻ἢ䛳䛶ほᐹ䛥䜜䛯䚹䛧䛛䜒䚸䛭䛯ෆ㒊 Mg ᣑᩓ(IMD : internal Mg diffusion)ἲ䛻䜘䜚䚸10T ௨䜜䜙䛾䜽䝷䝑䜽䛿ᮍ⤖ᬗ໬㡿ᇦ䛻䜒ほᐹ䛥䜜䛯䚹䛭䛾䛯䜑䚸䜽ୖ䛾㧗☢ሙ㡿ᇦ䛻䛚䛔䛶䜒㧗䛔 Jc 䜢♧䛩 MgB2 ⥺ᮦ䛜స〇䝷䝑䜽䛿⇕ฎ⌮๓䛾ᶵᲔຍᕤ᫬䛻Ⓨ⏕䛧䛶䛔䜛䛣䛸䛜♧၀䛥ྍ⬟䛸䛺䛳䛯(1)䛜䚸ᐇ⏝䛻䛿᭦䛺䜛 Jc 䛾ྥୖ䛜ồ䜑䜙䜜䜛䚹Jc䜜䛯䚹䜎䛯䚸䜽䝷䝑䜽䛾ᖜ䛿 800ÛC ⇕ฎ⌮⥺ᮦ䛾䜋䛖䛜ᗈ䛔ഴ䛿ෆ㒊⤌⧊䛾ᙳ㡪䜢ཷ䛡䜛䛯䜑䚸⇕ฎ⌮᮲௳䛾᭱㐺໬➼䛜ྥ䛻䛒䜚䚸䜽䝷䝑䜽䛾ᡂ㛗䛻⇕ฎ⌮䛜ᙳ㡪䛧䛶䛔䜛䛣䛸䛜䜟䛛㔜せ䛸䛺䜛䚹౛䛘䜀䚸640ÛC-1 h 䛾⇕ฎ⌮䛷స〇䛧䛯 IMD ⥺䛳䛯䚹ᮦ䛿඲☢ሙ㡿ᇦ䛷㧗䛔 Jc 䜢♧䛩䛜䚸800ÛC-1 h 䛾⇕ฎ⌮䛷స〇䛧䛯 IMD ⥺ᮦ䛾 Jc 䛿䝊䝻䛷䛒䜛䚹ᮏ◊✲䛷䛿䚸IMD ⥺ᮦ䛾䝬䜽䝻⤌⧊䛻ཬ䜌䛩⇕ฎ⌮᮲௳䛾ᙳ㡪䜢᫂䜙䛛䛸䛩䜛䛣䛸䜢
Drawing┠ⓗ䛸䛧䚸㉮ᰝ㟁Ꮚ㢧ᚤ㙾ἲ䜢⏝䛔䛶⇕ฎ⌮᮲௳䛾␗䛺䜛
direction
MgB2 ⥺ᮦ䛾䝬䜽䝻⠊ᅖ䛷䛾⤌⧊ほᐹ䜢⾜䛳䛯䚹㻌
Crystallized MgB2 region㻞䠊ヨᩱస〇䛚䜘䜃ᐇ㦂᪉ἲ㻌䝻䝑䝗≧䛾⣧ Mg 䜢 Ta 䝟䜲䝥䛻ᤄධᚋ䚸㠀ᬗ㉁ B ⢊ᮎ
(Mg : B =1.3 : 2 (mol ẚ))䛸 SiC ⢊ᮎ(10 mol% SiC)䛾ΰྜ⢊ᮎ䜢䚸Mg 䛸 Ta 䛾㝽㛫䛻඘ሸ䛧䛯䚹䛭䛾ᚋ䚸⁁䝻䞊䝹ຍᕤ䛚䜘䜃⥺ᘬ䛝ຍᕤ䜢⾜䛔䚸༢ⰺ⥺䜢స〇䛧䛯䚹ḟ䛻䚸༢ⰺ⥺䜢
Cu-10 wt% Ni 䝟䜲䝥䛻 7 ᮏᤄධ䛧䚸⁁䝻䞊䝹ຍᕤ䛸⥺ᘬ䛝ຍᕤ 䜢 ⾜ 䛔 䚸 7 ⰺ ⥺ 䜢 స 〇 䛧 䛯 䚹 䛣 䜜 䛻 䚸 Ar 㞺 ᅖ Ẽ ୰ 䛷
Uncrystallized region
640ÛC-1h 䜎䛯䛿 800ÛC-1h 䛾⇕ฎ⌮䜢᪋䛧䚸Mg ཎᏊ䜢 B ⢊ᮎഃ䛻ᾐ㏱䛥䛫䚸MgB2 ከⰺ⥺ᮦ䜢ᚓ䛯䚹10 ȝmTa sheath tube䜶䝍䝜䞊䝹䜢⏝䛔䛶‵ᘧ◊☻䛧䛯⥺ᮦ᩿㠃ヨᩱ䜢䚸㉮ᰝ㟁Ꮚ㢧ᚤ㙾(SEM) (ຍ㏿㟁ᅽ: 5-10 kV, Working Distance =Fig. 1 Cross-sectional SEM image of the wire heated at640ÛC for 1 h.
5-10 mm)䛻䜘䜚ほᐹ䛧䛯䚹㻌㻟䠊⤖ᯝ䛚䜘䜃⪃ᐹ㻌
Drawing
Fig. 1 䛻䚸640ÛC-1h 䛾⇕ฎ⌮䛻䜘䜚స〇䛧䛯 IMD ⥺ᮦ䛾direction
SEM ീ䜢♧䛩䚹ീ䛾ᕥྑ᪉ྥ䛜⥺ᘬ䛝᪉ྥ䛷䛒䜛䚹Ta ⿕そ⟶ (Ta sheath) 䛻ἢ䛳䛶ᬯ䛔䝁䞁䝖䝷䝇䝖䛾㡿ᇦ䛜ぢ䜙䜜䜛䚹
Uncrystallized region䛣䜜䛿⥺ᮦ୰ᚰഃ䛾 MgB2 ⤖ᬗ໬㡿ᇦ (Crystallized MgB2
region) 䛻ᑐ䛧䛶 MgB2 ⤖ᬗ䛜䜋䛸䜣䛹Ꮡᅾ䛧䛺䛔ᮍ⤖ᬗ໬㡿ᇦ(Uncrystallized region)䛻ᑐᛂ䛧䛶䛔䜛(2)䚹䛣䛾䜘䛖䛺ᮍ⤖ᬗ໬㡿ᇦ䛿⥺ᘬ䛝᪉ྥ䛻ᆒ୍䛺ཌ䛥䛷Ꮡᅾ䛧䛶䛔䜛䚹䜎䛯䚸
Crystallized MgB2 region
Fig. 1 ୰䛻▮༳䛷♧䛧䛯᫂䜛䛔㡿ᇦ䛻䛿䚸ඖ⣲ศᯒ䛾⤖ᯝ䚸Mg 䛜ከ䛟Ꮡᅾ䛧䛶䛔䜛䛣䛸䛜ศ䛛䛳䛯䚹䛣䜜䛿䚸䜽䝷䝑䜽䛻ᾐ
㏱䛧䛯 Mg 䛜㓟໬䛧䛶ᙧᡂ䛧䛯 MgO 䛷䛒䜛ྍ⬟ᛶ䛜䛒䜛䚹
Fig. 2 䛻䚸800ÛC-1h 䛾⇕ฎ⌮䛻䜘䜚స〇䛧䛯 IMD ⥺ᮦ䛾
5 ȝm
Ta sheath tube
SEM ീ䜢♧䛩䚹640ÛC ⇕ฎ⌮⥺ᮦ䛸䛿␗䛺䜚䚸⤖ᬗ໬ MgB2
Fig. 2 Cross-sectional SEM image of the wire heated at䛚䜘䜃ᮍ⤖ᬗ໬㡿ᇦ䛾ศᕸ䛜ᆒ୍䛷䛿䛺䛔䚹౛䛘䜀䚸ሙᡤ
800ÛC for 1 h.
䛻䜘䛳䛶䛿⥺ᮦ䛾୰ᚰഃ䛻䜒ᮍ⤖ᬗ໬㡿ᇦ䛜ศᕸ䛧䛶䛚䜚䚸ཧ⪃ᩥ⊩㻌
Fig. 2 ྑഃ䛾䜘䛖䛻 MgB2 ⤖ᬗ໬㡿ᇦ䛜䜋䛸䜣䛹Ꮡᅾ䛧䛺䛔㡿
㻝㻚㻌 K. Togano et al.: Supercond. Sci. Technol., 22 (2009),
ᇦ䜒䛒䜛䚹
015003.
䛣䛣䛷䚸⇕ฎ⌮ ᗘ䛾ᙳ㡪䜢⪃䛘䜛䚹Mg 䛾⼥Ⅼ䛿 650ÛC 䛷
2.
ᔱ⏣㞝௓ࡽ: Abstracts of CSJ Conference, 82 (2010) 117. 䛒䜛䛯䜑䚸640ÛC ⇕ฎ⌮᫬䛾 Mg 䛾཯ᛂ䛿ᇶᮏⓗ䛻ᅛ┦཯ᛂ䛷䛒䜚䚸⥺ᮦ୰ᚰഃ䛾 Mg 䛸 B 䛾᥋䛧䛶䛔䜛㡿ᇦ䛛䜙ᚎ䚻䛻
MgB2 䜢ᙧᡂ䛧䛺䛜䜙⥺ᮦእഃ䜈཯ᛂ䛜㐍⾜䛩䜛䛸⪃䛘䜙䜜䜛䚹୍᪉䚸800ÛC ⇕ฎ⌮᫬䛾 Mg 䛿ᾮయ䛾䛯䜑䚸⥺ᮦ୰ᚰഃ䛷 MgB2 䛜ᙧᡂ䛩䜛䛰䛡䛷䛺䛟䚸B ⢊ᮎ㛫䛾✵㛫䜔䚸⇕ฎ⌮― 90 ―

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MgB2 (2)㻵㼚㻙㼟㼕㼠㼡 ἲ 㻹㼓㻮㻞㻛㻺㼎㻛㻹㼛㼚㼑㼘 ⥺ᮦ䛾⮫⏺㟁ὶᐦᗘ 㻶㻌㻯㻌䇷㻌 ⥺ᚄ౫Ꮡᛶ㻌 䇷㻌㻯㼞㼕㼠㼕㼏㼍㼘㻌㻯㼡㼞㼞㼑㼚㼠㻌㻰㼑㼚㼟㼕㼠㼥㻌㼛㼒㻌㻵㼚㻙㼟㼕㼠㼡㻌㻹㼓㻮㻞㻛㻺㼎㻛㻹㼛㼚㼑㼘㻌㼃㼕㼞㼑㻌㻙㻻㼡㼠㼑㼞㻌㻰㼕㼍㼙㼑㼠㼑㼞㻌㻰㼑㼜㼑㼚㼐㼚㼏㼑㻙㻌㻌୰ᒣ㻌 ెጾ䠈㻌 㕥ᮌ㻌 ᗣṇ䠈㻌 ᑿ㷂㻌 Ὀᩥ䠈㻌 ྜྷ⏣㻌 ྐ἞䠄᪥኱⌮ᕤ䠅䠗㻌 ๓⏣㻌 ✑䠄㼁㻻㼃䠅㻧㻌 ஂಖ⏣㻌 ὒ஧䠄᪥኱⌮ᕤ䠅㻌㻺㻭㻷㻭㼅㻭㻹㻭㻌㼅㼛㼟㼔㼕㼠㼍㼗㼑㻘㻌㻿㼁㼆㼁㻷㻵㻌㼅㼛㼟㼔㼕㼙㼍㼟㼍㻘㻌㻻㻿㻭㻷㻵㻌㼅㼍㼟㼡㼒㼡㼙㼕㻘㻌㼅㻻㻿㻴㻵㻰㻭㻌㻲㼡㼙㼕㼔㼍㼞㼡㻘㻌㻔㻯㻿㼀㻘㻌㻺㼕㼔㼛㼚㻌㼁㼚㼕㼢㻚㻕㻧㻌 㻌㻹㻭㻱㻰㻭㻌㻹㼕㼚㼛㼞㼡㻌㻔㼁㻻㼃㻕㻧㻌㻷㼁㻮㻻㼀㻭㻌㼅㼛㼖㼕㻔㻯㻿㼀㻘㻌㻺㼕㼔㼛㼚㻌㼁㼚㼕㼢㻚㻕㻌 㻌㻱㻙㼙㼍㼕㼘㻦㻌㻹㻼㻰㻬㼚㼕㼔㼛㼚㻙㼡㻚㼚㼑㻚㼖㼜㻌

10

6

T = 20K
10

650ºC

5

2

㻞䠊ᐇ㦂㻌
ヨ⸆䛾 Mg (99.9%, 300-760Pm)䛸 B (95%, 0.85Pm)䜢໬Ꮫ㔞ㄽẚ㻌 Mg / B㻌 =㻌 1 / 2 䛻⛗㔞䛩䜛䚹䛣䜜䜙䜢 Ar 䜺䝇୰䛷 40ศΰྜ䛧䛯ᚋ䚸I 5.3 䛾ᅽ⢊ᆺ䛻ධ䜜䚸4䡐䛾㔜䛥䜢 10 ศ㛫ຍ䛘䛶ᅽ⢊య䛻ᡂᆺ䛩䜛䚹䛣䜜䜢㛗䛥 40mm䚸እᚄI 9.5䚸⫗ཌ2mm 䛾 Nb 䝅䞊䝇䛻ワ䜑䚸⁁䝻䞊䝹䛷እᚄI 3.47 䜎䛷ᅽᘏຍᕤ䜢᪋䛩䚹䛣䛾እഃ䛻እᙧI 6.0䚸⫗ཌ 1.265mm 䛾 Monel 䝟䜲䝥䜢⿦╔䛩䜛䚹䛣䜜䜢෌䜃⁁䝻䞊䝹䛷እᚄI0.93 䜎䛷ᅽᘏຍᕤ䛧䚸䛭䛾ᚋ୸䝎䜲䝇䜢⏝䛔䛶እᚄI 0.87䚸I 0.602䚸I0.400䚸
I 0.206 䜎䛷⦰ᚄ䛩䜛䚹䛣䜜䜙䜢 650䉝-0.5,㻌 1,㻌 2,㻌 4h 䛾⇕ฎ⌮䜢⾜䛔ヨᩱ䛸䛧䛯䚹ヨᩱ䛾 IC 䛿㉸ఏᑟ䝬䜾䝛䝑䝖䜢⏝䛔䛶᭱኱䠑T 䜎䛷䚸 ᗘ
20K 䛷䚸IC ᐃ⿦⨨䜢⏝䛔䛶 ᐃ䛧䛯䚹IC 䛿ヨᩱ䛻 1PV/cm
䛾㟁ሙ䛜Ⓨ⏕䛧䛯㟁ὶ䛷ᐃ⩏䛧䛯䚹JC 䛿 IC 䜢 MgB2㻌 䝁䜰䛾᩿㠃✚䛷๭䛳䛶ồ䜑䛯䚹䜎䛯ヨᩱ⾲㠃䜢ほᐹ䛩䜛䛯䜑䛻 SEM
䜢⏝䛔䛯䚹

Fig.3.䛻እᚄ I0.206 䛾 650䉝䛷స〇䛧䛯ヨᩱ䛾 JC 㻌 vs.㻌time 䛾䜾䝷䝣䜢♧䛩䚹⅔෭䛸䜽䜶䞁䝏䛧䛯ヨᩱ䜢ẚ㍑䛩䜛䛸䚸እ㒊☢ሙ䛜ప䛔ሙྜ䚸䜽䜶䞁䝏䛷స〇䛧䛯ሙྜ䛾᪉䛜㧗䛔JC 䜢♧䛧䛶䛔䜛䚹䛧䛛䛧䚸እ㒊☢ሙ䛜㧗䛟䛺䜛䛸䚸⅔෭䛸䜽䜶䞁䝏ヨᩱ䛷 JC 䛾ᕪ䛿ᑡ䛺䛟䛺䜛䚹5T 䛷䛿䚸⅔෭䛷స〇䛧䛯ヨᩱ䛾 JC 䛜䜽䜶䞁䝏䛾䜒䛾䜘䜚䜒኱䛝䛟䛺䛳䛶䛔䜛䚹䛣䜜䜙䜘䜚䚸ప☢ሙഃ䛷㧗䛔 JC 䜢♧䛩䛾䛿䜽䜶䞁䝏䛧䛯ヨᩱ䛷䛒䜛䚹୍᪉䚸㧗☢ሙഃ䛷㧗䛔 JC 䜢♧䛩䛾䛿⅔෭䛾ヨᩱ䛾䜘䛖䛷䛒䜛䚹ヲ⣽䛺᳨ウ䛿ᙜ᪥ሗ࿌䛩䜛䚹JC (A/cm )㻝䠊䛿䛨䜑䛻㻌
⮫⏺ ᗘ TC䠙39K 䛾㔠ᒓ⣔㉸ఏᑟయ䛾 MgB2 䛿䚸20K ㏆ഐ䛷䛾ᐇ⏝໬䛻ྥ䛡䛯◊✲䛜┒䜣䛻⾜䜟䜜䛶䛔䜛䚹䛭䛾䛯䜑䛻䛿䠩䡃䠞䠎䛾㧗䠦䠿໬䛜ᚲせ䛷䛒䜛䚹䛣䛣䛷䛿䚸In-situ ἲ䜢⏝䛔䛶䚸MgB䠎/Nb/Monel ⥺ᮦ䜢స〇䛧ヨᩱ᩿㠃䛾䠯䠡䠩⏬ീ䚸JC 䛾⥺ᚄ౫Ꮡᛶ[1]䜢ㄪ䜉䚸䛭䛾⤖ᯝ䜢ሗ࿌䛩䜛䚹

㻟䠊⤖ᯝ㻌
Fig.1.䛻 650䉝-2h 䛷⇕ฎ⌮䛧䛯I0.87 䛾ヨᩱ䛾ᶓ᩿㠃䜲䝯䞊䝆䜢♧䛩䚹୰ᚰ㒊䛾㯮Ⰽ䛾⃰䛔㒊ศ䜘䜚ෆഃ䛜 MgB2 䝁䜰㡿ᇦ䛷䛒䜛䚹䝁䜰㒊䛾ᙧ≧䛿┦ఝ䛷䛒䜚䜋䛸䜣䛹⥺ᮦᚄ䛻䛿౫Ꮡ䛧䛶䛔䛺䛔䚹
Fig.2.䛻እᚄI0.87䚸እᚄI0.602䚸እᚄI0.206 䜢 650䉝䛷

10

4

10

3

10

2

I0.87I0.602I0.206
0

1

2

3
4
Bex( T )㻌
JC at 20K㻌 vs.㻌 Bex .

Fig.2.

10⇕ฎ⌮䛧䛯ヨᩱ䛾 JC㻌 vs.㻌 Bex 䜢♧䛩䚹እᚄI 0.87 䛾ヨᩱ䛿⇕ฎ⌮᫬㛫䠄time䠅2h 䛷⅔෭䚸I0.602 䛾 time 䛜 1h 䛷⅔෭䚸I0.206 䛿 1h 䛷䜽䜶䞁䝏䛻䜘䜚䛭䜜䛮䜜స〇䛧䛯䚹Fig.2.䜘䜚⥺ᮦ⣔䛜ᑠ䛥䛟䛺䜜䜀䛺䜛䜋䛹䚸እ㒊☢ሙ䛾್䛻䜘䜙䛪 JC 䛜ྥୖ䛧䛶䛔䜛䛣䛸䛜ศ䛛䜛䚹

5

6

㻌

5

650°C

6
4
2

2

JC (A/cm )

10

10

4
6
4
2
3
6
4
2

10

㻌
Fig.1.㻌 SEM image of I0.87 wire after heat treatment.

2h
1h
1h

T = 20K

2

0

Furnace Cool Quench B( T )
2T
3T
4T
5T

1

2
3
time ( h )Fig.3.

JC㻌 at 20K㻌 vs. 䡐ime.

4

5

ཧ⪃ᩥ⊩㻌
1. Y. Watanabe,㻌 et al.: Abstracts of CSJ Conference,Vol.81(2009) p.166― 91 ―

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1D-p08

MgB2 (2)㻵㼚㻙㼟㼕㼠㼡 ἲ䛻䜘䜛 㻹㼓㻮㻞㻛㻺㼎㻛㻹㼛㼚㼑㼘 ⥺ᮦ䛾⮫⏺㟁ὶᐦᗘ 㻶㻌㻯㻌䇷㻌 㻹㼓 ⢏ᚄ౫Ꮡᛶ㻌 䇷㻌㻯㼞㼕㼠㼕㼏㼍㼘㻌㻯㼡㼞㼞㼑㼚㼠㻌㻰㼑㼚㼟㼕㼠㼥㻌㼛㼒㻌㻵㼚㻙㼟㼕㼠㼡㻌㻹㼓㻮㻞㻛㻺㼎㻛㻹㼛㼚㼑㼘㻌㼃㼕㼞㼑㻌㻙㻹㼍㼓㼚㼑㼟㼕㼡㼙㻌㻿㼕㼦㼑㻌㻰㼑㼜㼑㼚㼐㼑㼚㼏㼑㻙㻌

2

JC (A/cm )㻌ᑿ㷂㻌 Ὀᩥ㻘㻌 ୰ᒣ㻌 ెጾ㻘㻌 㕥ᮌ㻌 ᗣṇ㻘㻌 ྜྷ⏣㻌 ྐ἞㻔᪥኱⌮ᕤ㻕䠗㻌 ๓⏣㻌 ✑㻔㼁㻻㼃㻕䠗㻌 ஂಖ⏣㻌 ὒ஧䠄᪥኱⌮ᕤ䠅㻌㻻㻿㻭㻷㻵㻌㼅㼍㼟㼡㼒㼡㼙㼕㻘㻌 㻺㻭㻷㻭㼅㻭㻹㻭㻌㼅㼛㼟㼔㼕㼠㼍㼗㼑㻘㻌㻿㼁㼆㼁㻷㻵㻌㼅㼛㼟㼔㼕㼙㼍㼟㼍㻘㻌㼅㻻㻿㻴㻵㻰㻭㻌㻲㼡㼙㼕㼔㼍㼞㼡䠄㻯㻿㼀㻘㻌㻺㼕㼔㼛㼚㻌㼁㼚㼕㼢㻚䠅㻧㻌 㻌㻹㻭㻱㻰㻭㻌㻹㼕㼚㼛㼞㼡㻌㻔㼁㻻㼃㻕㻧㻌㻷㼁㻮㻻㼀㻭㻌㼅㼛㼖㼕㻌㻔㻯㻿㼀㻘㻌㻺㼕㼔㼛㼚㻌㼁㼚㼕㼢㻚㻕㻌 㻌㻱㻙㼙㼍㼕㼘㻦㻌㻹㻼㻰㻬㼚㼕㼔㼛㼚㻙㼡㻚㼚㼑㻚㼖㼜㻌㻌
6㻝䠊䛿䛨䜑䛻㻌
10㔠ᒓ⣔㉸ఏᑟయ䛾୰䛷᭱䜒㧗䛔⮫⏺ ᗘ䜢ᣢ䛴 MgB2 䛿䚸
T = 20K
JC 䜢ྥୖ䛥䛫䜛䛯䜑䛾ᵝ䚻䛺◊✲䛜⾜䜟䜜䛶䛔䜛䚹Heat Treatment
5650䉝 - 120minᮏ◊✲䛷䛿䚸Mg 䛸 B 䛾ΰྜ⢊䜢඘ሸ䛧䛯㔠ᒓ䝅䞊䝇䜢ᅽ
10ᘏຍᕤᚋ䚸⇕ฎ⌮䜢⾜䛖 In-situ ἲ䜢⏝䛔䛶 MgB2/Nb/Monelヨᩱ䜢స〇䛧䛯䚹ヨᩱ᩿㠃䛾 SEM ⏬ീ䚸JC 䛾 Mg ⢏ᚄཬ䜃
410⥺ᚄ౫Ꮡᛶ[1]䜢ㄪ䜉䛯䛾䛷䚸䛭䛾⤖ᯝ䜢ሗ࿌䛩䜛䚹

0

1

2

3
Bex ( T )4

5

6

Fig.1.㻌 JC at 20K vs. Bex .
610

T = 20K

Heat Treatment
650䉝 - 60min

5

10
2

4

10

#2-1
#2-2
#2-3
#2-4

3

10

Specifications of samples
Mg Size
Core Area(10-2 mm2)
(Pm)
3000-5000
5.7
300-760
6.2
150
6.8
50
5.8
3000-5000
2.5
300-760
3.0
150
3.3
50
3.5

2

10

0

1

2

3

4

5

6

Bex ( T )Fig.2.㻌 JC at 20K vs. Bex .
610

T = 20K
5

10

㻟䠊⤖ᯝ㻌
ヨᩱ䛾ㅖඖ䜢Table 1.䛻♧䛩䚹
Fig.1. 䛻⇕ฎ⌮᮲௳650䉝-120min䛷స〇䛧䛯#1-1~#1-4
ヨᩱ䛾20K䛻䛚䛡䜛JC ᑐ☢ሙ౫Ꮡᛶ䜾䝷䝣䜢♧䛩䚹#1-1䛸
#1-2ヨᩱ䛿䚸#1-3䛸#1-4ヨᩱ䛻ẚ䜉䛶5T௜㏆䛷䛿JC䛜㧗䛟䚸
㏫䛻ప☢ሙഃ䛷䛿䚸#1-3䛸#1-4ヨᩱ䛾᪉䛜#1-1䛸#1-2ヨᩱ䜘䜚JC䛜㧗䛟䛺䛳䛶䛔䜛䚹Fig.2. 䛻⇕ฎ⌮᮲௳650䉝-60min䛷స〇䛧䛯#2-1~#2-4ヨᩱ䛾20K䛻䛚䛡䜛JCᑐ☢ሙ౫Ꮡᛶ䜾䝷䝣䜢♧䛩䚹ヨᩱస〇᫬䛾Mg䝃䜲䝈䛜኱䛝䛔䜋䛹JC䛜㧗䛟䛺䛳䛶䛔䜛䚹Fig.3. 䛻⇕ฎ⌮᮲௳650䉝-60min䛷స〇䛧䛯#2-1~#2-4ヨᩱ䛾20K䛻䛚䛡䜛☢ሙ1T䚸2T䚸3T䚸4T䚸5T䛷䛾JCᑐMg䝃䜲䝈䛾䜾䝷䝣䜢♧䛩䚹ヨᩱస〇᫬䛾Mg䝃䜲䝈䛜኱䛝䛔䜋䛹JC䛜㧗䛟䛺䛳䛶䛔䜛䚹ヲ⣽䛺᳨ウ䛿ᙜ᪥ሗ࿌䛩䜛䚹

2

#1-1
#1-2
#1-3
#1-4
#2-1
#2-2
#2-3
#2-4

2

10

JC (A/cm )SampleTable 1.
O.D.
(mm)
0.87
0.87
0.87
0.87
0.602
0.602
0.602
0.602

#1-1
#1-2
#1-3
#1-4

3

10

JC (A/cm )㻞䠊ᐇ㦂㻌ᐇ㦂䛻⏝䛔䛯Mgヨ⸆䛾⣧ᗘ䛸⢏ᚄ䛿䚸䛭䜜䛮䜜99.99%
3000-5000Pm 䚸 99.9% 300-760Pm 䚸 99.9% 150Pm 䚸 99.8%
50Pm䛾4✀㢮䛷䛒䜛䚹ヨ⸆䛾Mg䛸B(95% 0.85Pm)䜢໬Ꮫ㔞
ㄽẚMg:B=1:2䛷⛗㔞䛧䛯䚹䛣䜜䜢Ar䜺䝇୰䛷40minΰྜ䛧䛯ᚋ䚸 I5.3䛾෇ᰕ≧䛾ᅽ⢊ᆺ䛻ධ䜜4t䛷10min䛾ຍ㔜䛷ᅽ⢊య䛻ᡂᆺ䛩䜛䚹䛣䜜䜢㛗䛥40mm䚸እᚄI 9.5䚸ෆᚄI 5.5䛾Nb䝅䞊䝇䛻ワ䜑䚸⁁䝻䞊䝹䛷እᚄI 3.47䜎䛷ᅽᘏຍᕤ䜢᪋䛧䚸䛥䜙䛻እഃ䛻እᚄ I 6.0䚸ෆᚄI 3.5䛾Monel䝟䜲䝥䜢⿦╔䛩䜛䚹䛣䜜䜢෌䜃⁁䝻䞊䝹䛷እᚄ I0.93䜎䛷ᅽᘏຍᕤ䛧䛯ᚋ䚸୸䝎䜲䝇䜢⏝䛔䛶እᚄI 0.87䛸I0.602䛾⥺ᮦ䜢స〇䛧䛯䚹I 0.87䛾
⥺ᮦ䛿650䉝-30䚸60䚸120䚸240min䛾⇕ฎ⌮䜢䚸I 0.602䛾⥺ᮦ䛿650䉝-30䚸60䚸120min䛾⇕ฎ⌮䜢⾜䛔ヨᩱ䛸䛧䛯䚹
ヨᩱ⾲㠃䜢ほᐹ䛩䜛䛯䜑䛻SEM䜢⏝䛔䚸MgB2㻌 Core䛾᩿㠃✚䛿SEM⏬ീ䛾Nb䜘䜚ෆഃ䛾㠃✚䛷ᐃ⩏䛧䛯䚹ヨᩱ䛾
20K䛷䛾IC䛿㉸ఏᑟ䝬䜾䝛䝑䝖䜢⏝䛔䛶᭱኱5T䜎䛷 ᐃ䛧䛯䚹IC 䛿ヨᩱ䛻1PV/cm䛾㟁ሙ䛜Ⓨ⏕䛧䛯㟁ὶ䛷ᐃ⩏䛧䛯䚹JC 䛿
IC䜢MgB2㻌 Core䛾᩿㠃✚䛷๭䛳䛶ồ䜑䛯䚹

4

10

3

B( T )
1T
2T
3T
4T
5T

10

2

10

Heat Treatment
650䉝 - 60min

1

10

1

10

2

10

3

10

4

10

Mg Size ( Pm )Fig.3.㻌 JC at 20K vs. Mg Size.
ཧ⪃ᩥ⊩㻌
1. Y. Watanabe,㻌 et al.:Abstracts of CSJ Conference, Vol.81(2009) p.166― 92 ―

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1D-p09

MgB2 (2)

MgB2 䝔䞊䝥⥺ᮦ䛻䛚䛡䜛 Jc 䛾☢ሙᗘ౫Ꮡᛶ㻌

Jc-B-T dependence of MgB2 tapes fabricated by PIT method㻌ᯇᮏ㻌 ᫂ၿ䠈㻌 ໭ཱྀ㻌 ோ㻘㻌 ⇃಴㻌 ᾈ᫂䠄≀㉁䞉ᮦᩱ◊✲ᶵᵓ䠅㻌㻹㻭㼀㻿㼁㻹㻻㼀㻻㻌㻭㼗㼕㼥㼛㼟㼔㼕䠈㻌 㻷㻵㼀㻭㻳㼁㻯㻴㻵㻌㻴㼕㼠㼛㼟㼔㼕㻘㻌㻷㼁㻹㻭㻷㼁㻾㻭㻌㻴㼕㼞㼛㼍㼗㼕㻌㻔㻺㻵㻹㻿㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㼙㼍㼠㼟㼡㼙㼛㼠㼛㻚㼍㼗㼕㼥㼛㼟㼔㼕㻬㼚㼕㼙㼟㻚㼓㼛㻚㼖㼜㻌㻌㻌

4㻌㻼㼡㼞㼑㻌㻹㼓㻮㻞㻌㻯㻙㼐㼛㼜㼑㼐㻌㻹㼓㻮㻞2

㻌

I002/I110

3

1

MgB2 powder
0

0

50

100

150

200

Thickness(Pm)Fig.1 Relative intensity ratio of I002/I110 of MgB2 peaks inpure and C-doped MgB2 samples.

㻲㼕㼓㻚㻝㻌㻸㼛㼓㼛㻌㼛㼒㻌㻯㼞㼥㼛㼓㼑㼚㼕㼏㻌㻭㼟㼟㼛㼏㼕㼍㼠㼕㼛㼚㻌㼛㼒㻌㻶㼍㼜㼍㼚㻌㻔㻥㻌㼜㼛㼕㼚㼠㻕㻌Fig.2 Typical SEM image of MgB2 grains in pure MgB2
tape.
㻌100000Pure tape

4.2 K (90deg)
4.2 K (0deg)
10 K (90deg)
10 K (0deg)
20 K (90deg)
20 K (0deg)
30 K (90deg)
30 K (0deg)

㻌

10000

Jc (A/cm2)

㻝䠊䛿䛨䜑䛻㻌
㻹㼓㻮㻞 ㉸ఏᑟయ䛾◊✲䛿⌧ᅾ䚸ᐇ⏝໬䜢┠ᣦ䛧䛶ୡ⏺ྛᅜ䛷άⓎ䛻㐍䜑䜙䜜䛶䛚䜚䚸㻹㻾㻵 ⏝䝬䜾䝛䝑䝖➼䜈䛾ᐇ⏝໬䛾◊✲䜒⾜䜟䜜䛴䛴䛒䜛䚹䛭䛾䜘䛖䛺≧ἣ䛾୰䚸⮫⏺㟁ὶᐦᗘ䠄 㻶㼏 䠅≉ᛶ䛾ྥୖ䛿䛥䜙䛺䜛ᛂ⏝⠊ᅖ䛾ᣑ኱䛾䛯䜑䛻㔜せ䛷䛒䜛䚹ᡃ䚻䛾䜾䝹䞊䝥䛷䛿䝩䝑䝖䝥䝺䝇ἲ䛻䜘䛳䛶స〇䛧䛯㻹㼓㻮㻞 ⥺ᮦ䛻䛚䛔䛶㧗䛔 㻶㼏 䛜ᚓ䜙䜜䛶䛔䜛஦䜢ሗ࿌䛧䛶䛝䛯䚹䛣䜜䛿䝔䞊䝥䝁䜰㒊䛾඘ሸ⋡䛾ቑຍ䛻క䛖䝁䝛䜽䝔䜱䝡䝔䜱䞊䛾ୖ᪼䛜せᅉ䛾୍䛴䛷䛒䜛䛣䛸䛜䜟䛛䛳䛯䚹ᮏ◊✲䛷䛿䚸㏻
ᖖ䛾䝟䜴䝎䞊䞉䜲䞁䞉䝏䝳䞊䝤䠄㻼㻵㼀䠅⥺ᮦ䛻䛚䛡䜛 㻶㼏 䛾 ᗘ౫Ꮡᛶ䛚䜘䜃␗᪉ᛶ䛻䛴䛔䛶᳨ウ䜢⾜䛳䛯䛾䛷ሗ࿌䛩䜛䚹㻌㻌㻞䠊ᐇ㦂᪉ἲ㻌㻹㼓㻮㻞 ⥺ ᮦ 䛿 ㏻ ᖖ 䛾 㻼㻵㼀 ἲ 䛻 䜘 䛳 䛶 స 〇 䛧 䛯 䚹 㻹㼓㻴㻞㻌㻔㻥㻥㻚㻤㻑㻕䛸䜰䝰䝹䝣䜯䝇 㻮㻔㻥㻥㻚㻥㻥㻑㻕䛾ΰྜ⢊ᮎ䜢⏝䛔䛯↓ῧຍΰྜ⢊ᮎ䚸䛚䜘䜃䛣䜜䜙䛾⢊ᮎ䛻䛥䜙䛻䝘䝜䝃䜲䝈 㻿㼕㻯䠄㻟㻜㼚㼙䠅䚸䜶䝏䝹䝖䝹䜶䞁䛾䠎䛴䛾୙⣧≀䜢ྠ᫬ῧຍ䛧䛯ΰྜ⢊ᮎ䜢⏝ព䛧䛯䚹䛣䜜䜙䛾⢊ᮎ䜢䛭䜜䛮䜜እᚄ 㻢㻚㻟㼙㼙䃥䚸ෆᚄ 㻟㻚㻡㼙㼙䃥䛾 㻲㼑 ⟶䛻ワ䜑㎸䜏䚸⁁䝻䞊䝹ᅽᘏ䚸䛚䜘䜃ᖹ䝻䞊䝹ᅽᘏ䜢᪋䛧䛯䚹௨ᚋ䚸↓ῧຍ⥺ᮦ䛚䜘䜃 㻯 ῧຍ⥺ᮦ䛸࿧䜆䚹ᚓ䜙䜜䛯୧⥺ᮦ䜢䜰䝹䝂䞁䜺䝇㞺ᅖẼୗ䛷 㻢㻟㻜䉝䚸㻝 ᫬㛫䛾⇕ฎ⌮䜢⾜䛳䛯䚹ᚓ䜙䜜䛯ヨᩱ䛻䛴䛔䛶䛿 㻿㻱㻹 䜔 㼄㻾㻰 䛻䜘䜛⤌⧊ほᐹ䚸䛚䜘䜃㟁Ẽ᢬ᢠ⋡ ᐃ䜔⮫⏺㟁ὶ≉ᛶ ᐃ➼䛾㉸ఏᑟ≉ᛶホ౯䜢⾜䛳䛯䚹⮫⏺㟁ὶᐦᗘ≉ᛶホ౯䛾䛯䜑䛻ᗘ䚸☢ሙ䛚䜘䜃☢ሙ༳ຍ᪉ྥ䜢ኚ໬䛥䛫䛺䛜䜙䚸 ᐃ䜢⾜䛳䛯䚹㻌㻌㻟䠊⤖ᯝ䛸⪃ᐹ㻌㻲㼕㼓㻚㻝 䛿↓ῧຍ⥺ᮦ䛸 㻯 ῧຍ⥺ᮦ䛾䛭䜜䛮䜜䛾⥺ᮦ䜢ཌ䛥᪉ྥ䛻◊☻䛧䛺䛜䜙 㼄 ⥺ᅇᢡᅗᙧ䜢ᚓ䛯䝕䞊䝍䛛䜙 㻹㼓㻮㻞䛾 㻵㻜㻜㻞 䛸 㻵㻝㻝㻜 䛾䝢䞊䜽ᙉᗘ䜢ཌ䛥᪉ྥ౫Ꮡᛶ䛸䛧䛶ᚓ䛯⤖ᯝ䜢♧䛩䚹ẚ㍑䛾䛯䜑䛻 㻹㼓㻮㻞 ⢊ᮎ䛻䛚䛡䜛 㻵㻜㻜㻞㻛㻵㻝㻝㻜 䛿 㻜㻚㻣 䛷䛒䛳䛯䠄ᅗ୰䛻┤⥺䛷♧䛧䛯䠅䚹䛣䜜䛻ᑐ䛧䛶䚸䝔䞊䝥⥺ᮦ䛷䛿䛔䛪䜜䜒䠍䜢㉸䛘䛶䛚䜚䚸㼏 ㍈㓄ྥ䛩䜛ഴྥ䛜ぢ䜙䜜䛶䛔䜛䛣䛸䛜䜟䛛䜛䚹䛯䛰䛧䚸㻜㻜㼘 䝢䞊䜽䛰䛡ほᐹ䛥䜜䜛䜟䛡䛷䛿䛺䛔䚹୍᪉䚸䛣䛾ᅗ䛿ཌ䛥᪉ྥ䛻◊☻䜢䛧䛶䛔䜛䛯䜑䚸୧➃㒊䛜㕲䝅䞊䝇䛻㏆䛔㡿ᇦ䛸䛺䜛䚹㻲㼕㼓㻚㻝 䛛䜙䛿䛭䛾୧➃㒊䛜୰ኸ㒊䛻ẚ䜉䛶 㻵㻜㻜㻞㻛㻵㻝㻝㻜 䛾್䛜㧗䛔ഴྥ䛜ぢ䜙䜜䜛䚹䛴䜎䜚䚸㕲䝅䞊䝇㒊௜㏆䛷䛿䜔䜔㓄ྥᗘ䛜㧗䛔䛣䛸䜢♧၀䛧䛶䛔䜛䚹㻲㼕㼓㻚㻞 䛻䝔䞊䝥ୖ㠃䛛䜙ほᐹ䛧䛯 㻿㻱㻹 ീ䜢♧䛩䚹䛣䛾ᅗ䛛䜙 㼏 ㍈㓄ྥ䛧䛯ᯈ≧䛾⤖ᬗ䜒ぢ䜙䜜䜛䛜䚸䛭䜜䛸䛿඲䛟䝷䞁䝎䝮䛺᪉ྥ䛻ᡂ㛗䛧䛶䛔䜛⤖ᬗ䜒ከᩘほᐹ䛥䜜䜛䚹௨ୖ䛾䝕䞊䝍䜘䜚䚸㼕㼚㻙㼟㼕㼠㼡㻹㼓㻮㻞 䝔䞊䝥⥺ᮦ䛻䛚䛔䛶䜒 㼏 ㍈㓄ྥ䛾ഴྥ䛜ぢ䜙䜜䜛䛜䚸䛭䛾㓄ྥᗘ䛿ᴟ䜑䛶⦆䜔䛛䛷䛒䜛䛸⪃䛘䜙䜜䜛䚹㻌㻲㼕㼓㻚㻟 䛻↓ῧຍ䝔䞊䝥⥺ᮦ䛻䛚䛡䜛 㻶㼏 䛾 ᗘ☢ሙ౫Ꮡᛶ䛾⤖ᯝ䜢♧䛩䚹ᅗ୰䛻䛿☢ሙ䜢䝔䞊䝥㠃䛻ᑐ䛧䛶ᆶ┤㻔㻥㻜㼐㼑㼓 䛸⾲♧㻕䛸ᖹ⾜㻔㻜㼐㼑㼓㻕䛻༳ຍ᪉ྥ䜢ኚ໬䛥䛫䛯⤖ᯝ䜢♧䛧䛯䚹⤌⧊ⓗ䛻䛿⦆䜔䛛䛺㓄ྥഴྥ䛻䛒䜛䛣䛸䜢♧䛧䛯䛜䚸㻶㼏 䛿ప 㧗☢⏺䛷䛿☢ሙ༳ຍ᪉ྥ䛻ᙉ䛟౫Ꮡ䛧䛶䛔䜛䛣䛸䛜䜟䛛䛳䛯䚹୍᪉䚸䝩䝑䝖䝥䝺䝇䜢⾜䛳䛯⥺ᮦ䛻䛴䛔䛶䜒ྠᵝ䛾ᐃ䜢⾜䛳䛯䚹䛭䜜䜙䛾⤖ᯝ䜒䝩䝑䝖䝥䝺䝇䜢⾜䛳䛶䛔䛺䛔⥺ᮦ䛸䜋䜌ྠᵝ䛾⤖ᯝ䛜ᚓ䜙䜜䛯䚹䛴䜎䜚䚸䝩䝑䝖䝥䝺䝇䛻䜘䛳䛶㓄ྥ໬䜒㐍䜐䛜䚸㏻ᖖ䛾 㻼㻵㼀 ἲ䛸ẚ䜉䛶䜒኱䛝䛺ኚ໬䛿ぢ䜙

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Magnetic Field (T)Fig.3 Jc-B-T curve of pure MgB2 tape.
䜜䛺䛛䛳䛯䚹䛣䛾䛣䛸䛿 㻶㼏 ≉ᛶྥୖ䛾୺せᅉ䛜䝩䝑䝖䝥䝺䝇䛻䜘䜛඘ሸ⋡䛾ྥୖ䛷䛒䜛䛣䛸䜢♧၀䛧䛶䛔䜛䚹㻌㻌ㅰ㎡㻌ᮏ◊✲䛾୍㒊䛿⛉Ꮫ◊✲㈝⿵ຓ㔠 㻝㻥㻣㻢㻜㻜㻝㻢 䛾ຓᡂ䜢ཷ䛡䛶ᐇ᪋䛥䜜䛯䜒䛾䛷䛒䜛䚹㻌― 93 ―

第83回

2010年度秋季低温工学・超電導学会

1D-p10鉄系超伝導体 (1)䝤䝻䝑䜽ᒙ䛜ཌ䛔㕲⣔㉸ఏᑟయ䛾⮫⏺㟁ὶ≉ᛶ㻌
Critical current properties of Fe-based superconductors with thick blocking layersୗᒣ῟୍ࠊⲶ㔝ᣅࠊబ⸨ఙஓࠊᕝཱྀ┤ⓏࠊΎỈಖ❶ࠊ⏫⏣೺ḟࠊᒣᮏ᫂ಖࠊᓊᑿග஧(ᮾ኱㝔ᕤ䚸JST-TRIP)SHIMOYAMA Jun-ichi, OGINO Hiraku, SATO Shinya, KAWAGUCHI Naoto, SHIMIZU Yasuaki, MACHIDA Kenji,
YAMAMOTO Akiyasu, KISHIO Kohji (Univ. of Tokyo, JST-TRIP)
E-mail: shimo@sogo.t.u-tokyo.ac.jp (J. Shimoyama)䛆䛿䛨䜑䛻䛇㻌 䛣䜜䜎䛷䛻㕲䝙䜽䝍䜲䝗⣔㉸ఏᑟయ䛻䛚䛔䛶䚸㖡㓟໬≀㉸ఏᑟయ䛻༉ᩛ䛩䜛ከᵝ䛺⤖ᬗᵓ㐀䜢᭷䛩䜛≀㉁䛜
Ⓨぢ䛥䜜䛶䛔䜛䚹䛣䜜䛿㏫䝩䝍䝹▼ᆺᵓ㐀䜢ᣢ䛴㕲䝙䜽䝍䜲䝗ᒙ䛾ᰂ㌾ᛶ䛻䜒䜘䜛䛜䚸䝤䝻䝑䜽ᒙ䛜䝨䝻䝤䝇䜹䜲䝖ᆺᵓ㐀㢮⦕䛾㓟໬≀ᒙ䛷䜒ᵓᡂ䛷䛝䜛䛣䛸䛜኱䛝䛔䚹ᡃ䚻䛿䚸᫖ᖺ䜘䜚䛣䛾䜘䛖䛺䝨䝻䝤䝇䜹䜲䝖㢮⦕ᵓ㐀䛾ཌ䛔㓟໬≀ᒙ䜢᭷䛩䜛ᩘከ䛟䛾᪂つ㕲⣔㉸ఏᑟయ䜢タィ䚸ྜᡂ䛧䛶䛝䛯[1-7]䚹䛭䛾⤖ᯝ䚸Fe 㠃㛫䛾㊥㞳䛿㖡㓟໬≀㉸ఏᑟయ CuO2 㠃㛫㊥㞳䜘䜚䜒኱䛝䛟ኚ໬䛩䜛䛣䛸䛜᫂䜙䛛䛸䛺䜚䚸ᮏ⣔䛾ΰྜ≧ែ䛻䛚䛡䜛䝢䞁䝙䞁䜾䚸⮫⏺㟁ὶ≉ᛶ䛸⤖ᬗᵓ㐀䛾㛵ಀ䛾◊✲䛻㖡㓟໬≀㉸ఏᑟయ䛸䛾ᑐẚ䜢ྵ䜑䛶⯆࿡䛜῝䜎䛳䛯䚹㻌 䝤䝻䝑䜽ᒙ䛜ཌ䛟䛺䜛䛺䜛䛸䛸䜒䛻㟁Ẽⓗ☢Ẽⓗ␗᪉ᛶ䛜኱䛝䛟䛺䜛䛣䛸䛜㖡㓟໬≀㉸ఏᑟయ䛷䛿䜘䛟▱䜙䜜䛶䛚䜚䚸Tc 䛷つ᱁໬䛧䛯 ᗘ䛷ẚ㍑䛧䛯ሙྜ䚸␗᪉ᛶ䛾ቑ኱䛸䛸䜒䛻 H // c䛻䛚䛡䜛୙ྍ㏫☢ሙ䛜⣔⤫ⓗ䛻పୗ䛩䜛䛣䛸䚸☢ሙ୰䛷䛾 Jc
䜒䜋䜌ྠᵝ䛺ഴྥ䜢♧䛩䛣䛸䛜䜟䛛䛳䛶䛔䜛䚹㖡㓟໬≀㉸ఏᑟయ䛷␗᪉ᛶ䛜኱䛝䛺௦⾲ⓗ≀㉁ Bi ⣔㉸ఏᑟయ䛾 CuO2 㠃㛫㊥㞳䛿 12.1 Å 䛷䛒䜛䛜䚸㕲䝙䜽䝍䜲䝗㉸ఏᑟయ䛻䛚䛔䛶䛿䚸䛿䜛䛛䛻㛗䛔 Fe 㠃㛫㊥㞳(dFe-Fe)䜢ᣢ䛴≀㉁⩌䜢ᡃ䚻䛿Ⓨぢ䛧䛶䛔䜛䚹Fig. 1 䛻䛿 22438䚸225411 ┦䛸࿧䜣䛷䛔䜛㕲䝙䜽䝍䜲䝗㉸ఏᑟయ䛾⤖ᬗᵓ㐀䜢♧䛧䛯䚹

Fig. 1 Crystal structures of layered iron pnictides with thickblocking layers, 22438 and 225411 phases.㻌 [AE : Ca, Sr, Ba䚸
M : Sc, (Mg,Ti), (Sc,Ti)]㻌 ௨ୖ䛾⫼ᬒ䛾䜒䛸䚸ᡃ䚻䛿䝤䝻䝑䜽ᒙ䛜ཌ䛔㕲䝙䜽䝍䜲䝗㉸ఏᑟయ䛾↝⤖యヨᩱ䛾☢໬≉ᛶ䜢ㄪ䜉䛶䛚䜚䚸๓ᅇ䛿䝤䝻䝑䜽ᒙ䛾ཌ䛥䛸୙ྍ㏫᭤⥺䛾㛵ಀ䜢ሗ࿌䛧䛯䚹௒ᅇ䛿䛥䜙䛻䝤䝻䝑䜽ᒙ䛜ཌ䛔 226412 ┦䜎䛷ྵ䜑䛶䚸୙ྍ㏫᭤⥺䛻ຍ䛘䛶⢏ෆ Jc 䛾ホ౯䜢⾜䛳䛯䛾䛷ሗ࿌䛩䜛䚹䛆ᐇ㦂䛇㻌 ୍㐃䛾↝⤖యヨᩱ䛿▼ⱥᑒ⟶ෆ䛻䛚䛡䜛ᅛ┦཯ᛂἲ䛻䜘䜚స〇䛧䛯䚹䛣䜜䜙䛾ヨᩱ䛻䛴䛔䛶 SQUID ☢᮰ィ䜢⏝䛔䛯☢໬ ᐃ䜢⾜䛳䛯䚹୙ྍ㏫☢ሙ䛾Ỵᐃ䛻⏝䛔䛯㜈್䛿
0.02 G 䛷䚸⢏ෆ Jc 䛸䛧䛶䛚䜘䛭 300 A/cm2 䛻┦ᙜ䛩䜛䚹⢏ෆ
Jc 䛾 ᗘ☢ሙ౫Ꮡᛶ䛿☢໬䝠䝇䝔䝸䝅䝇᭤⥺䛾ᖜ䛛䜙 Bean 䝰䝕䝹䛻䜘䜚⟬ฟ䛧䛯䚹䛣䛣䛷⢏ᚄ䛿 SEM 䛻䜘䜛ᚤ⣽⤌⧊ほᐹ⤖ᯝ䜘䜚 3 Pm 䛸䛧䛯䚹䛆⤖ᯝ䛸⪃ᐹ䛇㻌 ᮏ◊✲䛷䛿䚸 (Fe2As2)(Ca4(Mg,Ti)3O8) [Tc =42 K, dFe-Fe = 16.7 Å]䚸(Fe2As2)(Ca5(Sc,Ti)4O11) [33 K, 20.6 Å]䚸
䛚䜘䜃(Fe2As2)(Ca6(Al,Ti)4O12) [32 K, 22.7 Å]䛾☢໬≉ᛶ䜢ホ౯䛧䛯䚹⢏ෆ Jc 䛾 ᗘ䚸☢ሙ౫Ꮡᛶ䛾୍౛䛸䛧䛶䚸Fig. 2㻌
䛻(Fe2As2)(Ca5(Sc,Ti)4O11)䛻䛴䛔䛶ㄪ䜉䛯⤖ᯝ䜢♧䛧䛯䚹䛣
䜜䜙 3 ヨᩱ䛾 5 K䚸ప☢ሙୗ䛷䛾 Jc 䛿 6.5 ~ 9㻌 x 105 A/cm2 䛾㛫䛷䛒䜚䚸䝤䝻䝑䜽ᒙ䛾ཌ䛥䛸䛾᫂░䛺┦㛵䛿ㄆ䜑䜙䜜䛺䛛䛳䛯䚹⢏ᚄホ౯䛾᭕᫕䛥䜢⪃៖䛩䜛䛸䚸ཌ䛔䝤䝻䝑䜽ᒙ䜢ᣢ䛴䚸༶䛱 2 ḟඖᛶ䛜ᴟ䜑䛶ᙉ䛔≀㉁⩌䛷䛿䚸⢏ෆ Jc 䛿䜒䛿䜔䝤䝻䝑䜽ᒙ䛾ཌ䛥䛻౫Ꮡ䛫䛪䚸Fe2As2 䝰䝜䝅䞊䝖䛻䛚䛡䜛⮫⏺㟁ὶ≉ᛶ䜢཯ᫎ䛧䛯䜒䛾䛷䛒䜛䛣䛸䛜♧၀䛥䜜䛯䚹䜎䛯䚸 ᗘ䜔☢
ሙ䛾ୖ᪼䛻క䛖⢏ෆ Jc 䛾ῶ⾶䛿䛔䛪䜜䛾ヨᩱ䛻䛚䛔䛶䜒 Fig.
2 䛻♧䛧䛯䜘䛖䛻ᛴ⃭䛷䛒䜚䚸Tc 䛷つ᱁໬䛧䛯 ᗘ䛻䛚䛡䜛୙
ྍ㏫☢ሙ䛿䚸Bi ⣔ 2212 ┦㖡㓟໬≀㉸ఏᑟయ䛸ྠ⛬ᗘ䜒䛧䛟䛿䛭䜜௨ୗ䛷䛒䜛䛺䛹䚸䛣䜜䜙䛾⣔䛷䛿ᮏ㉁ⓗ䛻䝢䞁䝙䞁䜾ຊ䛜ᙅ䛔䛣䛸䛜☜ㄆ䛷䛝䛯䚹ㅮ₇䛷䛿䚸௚䛾㕲䝙䜽䝍䜲䝗㉸ఏᑟయ䛾≉ᛶ䜒⤂௓䛧䚸㖡㓟໬≀㉸ఏᑟయ䛸ẚ㍑䛧䛺䛜䜙䚸䝤䝻䝑䜽ᒙ䛾ཌ䛥䛸⮫⏺㟁ὶ≉ᛶ䛾㛵ಀ䜢㆟ㄽ䛩䜛䚹Fig. 2Intragrain Jc vs H plot for (Fe2As2)(Ca5(Sc,Ti)4O11) .

䛆ཧ⪃ᩥ⊩䛇㻌 [1] H. Ogino et al, SuST 22 (2009) 075008. [2].
H. Ogino et al., SuST 22 (2009) 085001. [3] S. Sato et al., SuST
23 (2010) 045001. [4] N. Kawaguchi et al., Appl. Phys. Exp.3(2010) 63102. [5] H. Ogino et al., Appl. Phys. Exp.3 (2010)
63103. [6] H. Ogino et al., Appl. Phys. Lett. 97 (2010) 072506.
[7] H. Ogino et al., Supercond. Sci. Technol. 23 (2010) 115005― 94 ―

第83回

2010年度秋季低温工学・超電導学会

1D-p11鉄系超伝導体 (1)㕲䜸䜻䝅䝙䜽䝍䜲䝗ከ⤖ᬗ䝞䝹䜽య䛾ᚤ⣽⤌⧊䛸⢏㛫⮫⏺㟁ὶ≉ᛶ
Microstructure and inter-granular critical current properties of polycrystalline iron-oxypnictide bulksᒣᮏ ᫂ಖ (ᮾ኱); 䝆䝱䝙䞊䞉䝆䝱䞁, ட㇂ ᩥ೺, 䜰䝘䝖䝸䞊䞉䝫䝸䝲䞁䝇䜻䞊, 䝆䜵䝺䝭䞊䞉䝽䜲䝇, 䜶䝸䝑䜽䞉䝦䝹䝇䝖䝻䝮,䝕䝡䝑䝗䞉䝷䝞䝺䝇䝔䜱䜶 (⡿ᅜ❧ᙉ☢ሙ◊✲ᡤ); 䜰䝹䝧䝹䝖䞉䝬䝹䝔䜱䝛䝸, 䜰䞁䝗䝺䜰䞉䝟䝺䞁䝌䞊䝘, 䝬䝑䝔䜸䞉䝖䝻䝢䜰䞊䝜,䝬䝸䝘䞉䝥䝑䝔䜱 䠄䜲䝍䝸䜰Ꮫ⾡఍㆟ CNR-SPIN䠈䝆䜵䝜䝞኱䠅
YAMAMOTO Akiyasu (Univ. Tokyo); JIANG Jianyi, KAMETANI Fumitake, POLYANSKII Anatolii, WEISS Jeremy,HELLSTROM Eric, LARBALESTIER David (NHMFL)䠗MARTINELLI Alberto, PALENZONA Andrea, TROPEANO Matteo,
PUTTI Marina (CNR-SPIN, Genova Univ.)
E-mail: yamamoto@appchem.t.u-tokyo.ac.jp
1. ࡣࡌࡵ࡟
㕲䝙䜽䝍䜲䝗⣔㉸ఏᑟయ䛿䠈㼆㼞㻯㼡㻿㼕㻭㼟 ᆺ䠄㻝㻝㻝㻝 ⣔䠅䛾ᒙ≧䜸䜻䝅䝙䜽䝍䜲䝗䛷᭱㧗 㻡㻡㻌 㻷 䛾㧗䛔㉸ఏᑟ㌿⛣ ᗘ䜢᭷䛧䠈ప 䛷㠀ᖖ䛻㧗䛔ୖ㒊⮫⏺☢ሙ䛸⢏ෆ⮫⏺㟁ὶᐦᗘ䜢♧䛩㼇㻝㻘㻞㼉䠊୍᪉䛷 㻝㻝㻝㻝 ⣔㕲䜸䜻䝅䝙䜽䝍䜲䝗䛿 㻠 䜎䛯䛿 㻡 ඖ⣔䛛䜙䛺䜛໬Ꮫⓗ䠈ᮦᩱ⛉Ꮫⓗ䛻」㞧䛺≀㉁䛷䛒䜚䠈⌧ᅾ䜎䛷䛻ሗ࿌䛥䜜䛶䛔䜛ከ⤖ᬗయヨᩱ䛿䛔䛪䜜䜒୙⣧≀┦䜢ྵ䜏䠈༢┦ヨᩱ䛾ྜᡂ䛿ᐜ᫆䛷䛿䛺䛔㼇㻟㼉䠊䛣䛾䜘䛖䛺୙⣧≀┦䛾Ꮡᅾ䠈䛚䜘䜃⤖ᬗ⢏⏺䛻䛚䛡䜛⢏㛫ᙅ⤖ྜ䛿䠈ከ⤖ᬗయ䛻䛚䛡䜛⢏㛫⮫⏺㟁ὶᐦᗘ䛜⢏ෆ⮫⏺㟁ὶᐦᗘ䛸ẚ㍑䛧䛶 㻞䠈㻟 ᱆ప䛔ཎᅉ䛸䛺䛳䛶䛔䜛䛸⪃䛘䜙䜜䜛䠊ᮏ◊✲䛷䛿 㻿㼙㻲㼑㻭㼟㻔㻻㻘㻲㻕䛻䛴䛔䛶䠈↝⤖ฎ⌮䠈➼᪉ຍᅽ⇕ฎ⌮䜢᪋䛩䛣䛸䛻䜘䜚୙⣧≀䛾ᑡ䛺䛔⦓ᐦ䛺ከ⤖ᬗ䝞䝹䜽యヨᩱ䜢స〇䛧䠈䛣䜜䜙䛾ฎ⌮䛜ᚤ⣽⤌⧊䛸⮫⏺㟁ὶ≉ᛶ䛻ཬ䜌䛩ᙳ㡪䛻䛴䛔䛶ㄪ䜉䛯䠊
2. ᐇ㦂᪉ἲ
Sm, As 䜘䜚స〇䛧䛯 SmAs 䛸䠈Fe, Fe 2O3, FeF2 䜢ΰྜᚋ䠈䝨䝺䝑䝖ᡂᆺ䛧䠈▼ⱥᑒ⟶୰䛷 1000䉝䠈24 ᫬㛫䛾⇕ฎ⌮䜢⾜䛔
SmFeAsO0.85F0.15 䝞䝹䜽య䜢స〇䛧䛯(As-prepared: A1 ヨᩱ)䠊ᚓ䜙䜜䛯䝞䝹䜽య䛾୍㒊䛻ᑐ䛧䛶 1250䉝䠈24 ᫬㛫䛾ᖖᅽୗ↝⤖ฎ⌮(Sintered: S1 ヨᩱ)䠈200 MPa 䛾ᅽຊୗ䛻䛚䛔䛶 900䉝䛷 10᫬㛫䛾 HIP ➼᪉ຍᅽ⇕ฎ⌮(HIPed: H1 ヨᩱ)䜢᪋䛧䛯䠊ヨᩱ䛿⢊ᮎ X ⥺ᅇᢡ䛻䜘䜚ᵓᡂ┦䜢䠈FESEM(㉮ᰝᆺ㟁Ꮚ㢧ᚤ㙾)䛻䜘
䜚ᚤ⣽⤌⧊䜢䠈SQUID ☢᮰ィ䛻䜘䜚☢໬ཬ䜃ṧ␃☢໬䜢䠈☢ẼගᏛἲ䛻䜘䜚☢᮰ᐦᗘศᕸཬ䜃⮫⏺㟁ὶᐦᗘ(Jc)䜢ホ౯䛧䛯䠊
3. ⤖ᯝ࡜⪃ᐹX ⥺ᅇᢡ⤖ᯝ䜘䜚 S1, H1 ヨᩱ䛷䛿 A1 ヨᩱ䛸ẚ㍑䛧䛶୙⣧≀┦ SmOF, FeAs 䛜ῶᑡ䛧䛯䠊୍᪉䛷䠈S1, H1 ヨᩱ䛷䛿᱁Ꮚᐃᩘ䛾ᚤቑ䛜䜏䜙䜜䠈↝⤖䠈HIP ฎ⌮୰䛻 Sm1111 ┦୰䛾䝣䝑⣲㔞䛜ῶᑡ䛧䛯䛣䛸䛜♧၀䛥䜜䛯䠊ᅗ 1 䛻ྛヨᩱ䛾 FESEM ീ䜢♧䛩䠊↝⤖䠈HIP ฎ⌮䜢᪋䛩䛣䛸䛷ヨᩱෆ䛾✵㝽䛜ῶᑡ䛧䠈䛸䛟䛻 H1
ヨᩱ䛷䛿⦓ᐦ䛺⤌⧊䛜ほᐹ䛥䜜䛯䠊S1 ヨᩱ䛷䛿↝⤖䛻䜘䜚⤖ᬗ⢏ᚄ䛾ቑ኱䛜䜏䜙䜜䠈⤖ᬗ⢏⏺䛻䜽䝷䝑䜽䛜ㄆ䜑䜙䜜䛯䠊↝⤖䠈
HIP ฎ⌮ᚋ䛻䛿䠈A1 ヨᩱ䛷Ꮡᅾ䛧䛯⤖ᬗ⢏㛫䛾 FeAs ⃿䜜┦䛜䜏䜙䜜䛪䠈⤌⧊䛾⣧ᗘ䛜ྥୖ䛧䛯䛣䛸䛜ศ䛛䜛䠊
ᅗ 2 䛻ṧ␃☢໬䛾༳ຍ☢ሙ౫Ꮡᛶ䜢♧䛩䠊A1 ヨᩱ䛷䛿⤖ᬗ⢏㛫䛸⢏ෆ䛾⮫⏺㟁ὶ䛻ᑐᛂ䛩䜛᫂░䛺஧ẁ㌿⛣䛜ㄆ䜑䜙䜜
䛯䠊S1 ヨᩱ䛷䛿⢏㛫 Jc 䛻ᑐᛂ䛩䜛ప☢ሙഃ䛾㌿⛣䛜ᾘኻ䛧䠈⢏ෆ Jc 䛻ᑐᛂ䛩䜛㧗☢ሙഃ䛾㌿⛣䛜ቑ኱䛧䛯䠊䛣䜜䛿䠈⤖ᬗ⢏ᚄ䛾ቑ኱䛜⢏ෆ㟁ὶ䛻ᐤ୚䛩䜛୍᪉䠈⢏⏺䛾䜽䝷䝑䜽䛜⢏㛫㟁ὶ䜢ᢚไ䛧䛯䛣䛸䜢♧၀䛩䜛䠊H1 ヨᩱ䛷䛿ప☢ሙഃ䛾㌿⛣䛾ቑ኱䛜䜏䜙䜜䠈⢏㛫 Jc 䛿 A1 䛾 300 A/cm2 䛛䜙 400 A/cm2 䛻ᨵၿ䛧䛯䠊୍᪉䛷䠈HIP ฎ⌮ヨᩱ䛿୙⣧≀┦䛜ᑡ䛺䛟⦓ᐦ䛺ᚤ⣽⤌⧊䜢ᣢ䛴䛣䛸䜢⪃៖䛩䜛䛸ᚓ䜙䜜䛯 Jc 䛾ቑຍ䛿ᑡ䛺䛔䛸䛔䛘䜛䠊䛣䛾⌮⏤䛸䛧䛶䠈☢໬䛛䜙ぢ✚䜒䛳䛯 Tc 䛿 A1, S1, H1 ヨᩱ䛷䛭䜜

Fig. 1. Low (a,c,e) and high (b,d,f) magnification secondary electron
microscopy images for A1 (a, b) S1 (c, d) and H1 (e, f).

Fig. 2. Remanent m agnetization ( mR) a s a f unction o f m aximum
applied field (Ha) for all the samples.

䛮䜜 50, 45 , 3 7 K 䛷䛒䜚䠈ప䛔 Tc 䛜⪃䛘䜙䜜䜛䠊Sm1111 ከ⤖ᬗయ䛷᭱㧗䛾 Jc 䜢ᣢ䛴ヨᩱ䛾 Tc 䛜 55 K[1]䛷䛒䜛䛣䛸䜢⪃៖䛩䜛䛸䠈
Tc 䛩䛺䜟䛱䝗䞊䝥㔞䛜 Jc 䛻ᙉ䛔ᙳ㡪䜢୚䛘䜛䛣䛸䛜♧၀䛥䜜䜛䠊
4. ࡲ࡜ࡵ↝⤖䠈HIP ฎ⌮䛻䜘䜚 Sm1111 ከ⤖ᬗ䝞䝹䜽య䛾ᚤ⣽⤌⧊䛾⦓ᐦ໬䛸㧗⣧ᗘ໬䛻ᡂຌ䛧䛯䠊䛸䛟䛻 HIP ฎ⌮ヨᩱ䛿᪤䛻ሗ࿌䛥䜜䛯ヨᩱ୰䛷⣧ᗘ䠈⦓ᐦᗘ䛜᭱䜒㧗䛔䜒䛾䛾୍䛴䛸䛔䛘䜛䠊୍᪉䛷䠈⦓ᐦ䛛䛴㧗⣧ᗘヨᩱ䛷⢏㛫 Jc 䛜ప䛛䛳䛯䛣䛸䛿䠈䜸䜻䝅䝙䜽䝍䜲䝗ከ⤖ᬗయ䛻䛚䛡䜛ᮏ㉁ⓗᙅ⤖ྜ䜢䜘䜚ᙉ䛟♧၀䛩䜛䠊
[1] A. Yamamoto et al., Supercond. Sci. Technol. 21, 095008 (2008).
[2] ᒣᮏ᫂ಖ ࡯࠿, ➨79ᅇప ᕤᏛ࣭㉸㟁ᑟᏛ఍ ㅮ₇ᴫせ㞟p.57.
[3] ட㇂ᩥ೺, ᒣᮏ᫂ಖ, A. A. Polyanskii, D. Abraimov, P. Li, and D. C.
Larbalestier, ᪥ᮏ㔠ᒓᏛ఍ㄅ 74, 444-452 (2010).

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1D-p12鉄系超伝導体 (1)㻲㼑㻝㻞㻞 ༢⤖ᬗ䛾⮫⏺㟁ὶ≉ᛶ㻌㻯㼞㼕㼠㼕㼏㼍㼘㻌㼏㼡㼞㼞㼑㼚㼠㻌㼏㼔㼍㼞㼍㼏㼠㼑㼞㼕㼟㼠㼕㼏㼟㻌㼛㼒㻌㻲㼑㻝㻞㻞㻌㼟㼕㼚㼓㼘㼑㻌㼏㼞㼥㼟㼠㼍㼘㼟⟃ᮏ㻌 ▱Ꮚ䠈⏣㎶㻌 ᆂ୍㻌 䠄㻵㻿㼀㻱㻯䠅䠗ᖹ⏣΅㻘㻌 ᐑᆏⱱᶞ䠈⏣ᓥ⠇Ꮚ䠄㜰኱⌮䠅㻌㻯㻴㻵㻷㼁㻹㻻㼀㻻㻌㻺㼛㼞㼕㼗㼛㻘㻌㼀㻭㻺㻭㻮㻱㻌㻷㼑㼕㼕㼏㼔㼕㻌㻔㻵㻿㼀㻱㻯㻕䠗 㼃㼍㼠㼍㼞㼡㻌㻴㼕㼞㼍㼠㼍㻘㻌㻿㼔㼕㼓㼑㼗㼕㻌㻹㼕㼥㼍㼟㼍㼗㼍㻘㻌㻿㼑㼠㼟㼡㼗㼛㻌㼀㼍㼖㼕㼙㼍㻌㻔㻻㼟㼍㼗㼍㻌㼁㼚㼕㼢㻚㻕㻌 㻌㻱㻙㼙㼍㼕㼘㻦㻌㼏㼔㼕㼗㼡㻬㼕㼟㼠㼑㼏㻚㼛㼞㻚㼖㼜㻌㻠䠊ㅰ㎡㻌ᮏ◊✲䛿᪂䜶䝛䝹䜼䞊䞉⏘ᴗᢏ⾡⥲ྜ㛤Ⓨᶵᵓ䠄㻺㻱㻰㻻䠅䛾ጤクཬ䜃᪥ᮏᏛ⾡᣺⯆఍䛾᭱ඛ➃◊✲㛤Ⓨᨭ᥼䝥䝻䜾䝷䝮䛻䜘䜚ຓᡂ䜢ཷ䛡䛶ᐇ᪋䛧䛯䜒䛾䛷䛒䜛䚹䚹㻌

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㻲㼕㼓㻚㻝㻌 㻲㼕㼑㼘㼐㻌 㼐㼑㼜㼑㼚㼐㼑㼚㼏㼑㻌 㼛㼒㻌 㻶㼏㻌 㼒㼛㼞㻌 㼍㻌 㻮㼍㻔㻲㼑㻝㻙㼤㻯㼛㼤㻕㻞㻭㼟㻞䠄㼤㻩㻜㻚㻝䠅㼟㼕㼚㼓㼘㼑㻌㼏㼞㼥㼟㼠㼍㼘㻚㻌㻝㻚㻞㻞䠊ᐇ㦂᪉ἲ㻌ᐃ 䛻 䛿 㻮㼍㻔㻲㼑㻝㻙㼤㻯㼛㼤㻕㻞㻭㼟㻞 䠄 㼤㻩㻜㻚㻜㻢㻘 㻌 㻜㻚㻝㻘 㻌 㻜㻚㻝㻡 䠅 ཬ 䜃㻮㼍㻲㼑㻞㻔㻭㼟㻜㻚㻢㻡㻼㻜㻚㻟㻡㻕㻞 䛾䠐✀㢮䛾⤌ᡂ䠄௙㎸䜏䠅䛾༢⤖ᬗ䜢⏝䛔䛯䚹☢໬⋡ ᐃ䛛䜙ồ䜑䛯 㼀㼏 䠄䜸䞁䝉䝑䝖䠅䛿䛭䜜䛮䜜⣙㻝㻞㻚㻡㻷䚸㻞㻟㻚㻟㻷䚸㻝㻞㻚㻞㻷䚸㻞㻥㻚㻞㻷 䛷䛒䛳䛯䚹㻌☢໬ ᐃ䛿 㻿㻽㼁㻵㻰 ☢᮰ィ䠄㻽㼡㼍㼚㼠㼡㼙㻌㻰㼑㼟㼕㼓㼚 ♫䠅䜢⏝䛔䛶䚸䛩䜉䛶⤖ᬗ䛾 㼏 ㍈䛻ᖹ⾜䛻☢ሙ䜢༳ຍ䛧䛶⾜䛔䚸☢Ẽ䝠䝇䝔䝸䝅䝇䛾኱䛝䛥䛛䜙䚸ᣑᙇ 㻮㼑㼍㼚 䝰䝕䝹䠍䜢⏝䛔䛶 㻶㼏 ್䜢⟬ฟ䛧
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㻲㼕㼓㻚㻞㻌 㻼㼘㼛㼠㼟㻌 㼛㼒㻌 㼟㼏㼍㼘㼑㼐㻌 㼢㼛㼘㼡㼙㼑㻌 㼜㼕㼚㼚㼕㼚㼓㻌 㼒㼛㼞㼏㼑㼟㻌 㻲㼜㻛㻲㼜㻘㼙㼍㼤㻌 㼢㼑㼞㼟㼡㼟㻌㼞㼑㼐㼡㼏㼑㼐㻌 㼒㼕㼑㼘㼐㻌 㼎㻩㻮㼍㻛㻮㼕㼞㼞 㻌 㼒㼛㼞㻌 㼍㻌 㻮㼍㻔㻲㼑㻝㻙㼤㻯㼛㼤㻕㻞㻭㼟㻞 䠄㼤㻩㻜㻚㻝䠅㻌 㼀㼔㼑㻌㼘㼕㼚㼑㻌㼕㼟㻌㼍㻌㼒㼕㼠㻌㼣㼕㼠㼔㻌㻲㼜㻌㻛㻲㼜㻘㼙㼍㼤㻌㻩㻭㼎㼜㻔㻝㻙㼎㻕㼝㻚㻌 㻌
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㻟䠊ᐇ㦂⤖ᯝ㻌)LJ ࡟ 㻮㼍㻔㻲㼑㻝㻙㼤㻯㼛㼤㻕㻞㻭㼟㻞䠄㼤㻩㻜㻚㻝䠅䛾 -F% ᭤⥺ࡢ ᗘ౫Ꮡᛶࢆ♧ࡍࠋ ᐃࡋࡓ඲ ᗘ㡿ᇦ࡟ࢃࡓࡗ࡚ <%&2 ⣔࡛ሗ࿌ࡉࢀ࡚࠸ࡿࡼ࠺࡞ࣆ࣮ࢡຠᯝࡀࡳࡽࢀ࡚࠸ࡿࠋྠᵝ࡞ࣆ࣮ࢡຠᯝࡣ [  ཬࡧ  ࡢヨᩱ࡟࠾࠸࡚ࡶࡳࡽࢀࡓࠋ

)LJ ࡟つ᱁໬ࡋࡓࣆࣥຊᐦᗘ㸦)S)SPD[㸧ࢆ E %%LUU
࡟ᑐࡋ࡚ࣉࣟࢵࢺࡋࡓ⤖ᯝࢆ♧ࡍࡀࠊ㠀ᖖ࡟ࡼࡃࢫࢣ࣮
ࣜࣥࢢࡉࢀࡿࡇ࡜ࡀࢃ࠿ࡿࠋࡲࡓࠊ )S)SPD[ $ES E T
ࡢᘧࢆ⏝࠸ࡓ ILWWLQJ ࢆ⾜࡞ࡗࡓ࡜ࡇࢁ㸦ᅗ୰ᐇ⥺㸧ࠊ
S  ཬࡧ T  ࡜࡞ࡗࡓࠋࡉࡽ࡟ࠊྠᵝࡢゎᯒࢆ㻮㼍㻔㻲㼑㻝㻙㼤㻯㼛㼤㻕㻞㻭㼟㻞 䠄㼤㻩㻜㻚㻝㻡䠅࡟ࡘ࠸࡚ࡶࠊ⾜࡞ࡗࡓ࡜ࡇࢁࠊ
S  ཬࡧ T  )LJ ࡛࠶ࡗࡓࠋ
ࡇࢀࡽࡢ್ࡣ 1G%D&X2\ ⁐⼥จᅛヨᩱ࡜㠀ᖖ࡟㏆࠸್ ࡛࠶ࡾࠊ㢮ఝࡢࣆࣥṆࡵᶵᵓࡀാ࠸࡚࠸ࡿࡇ࡜ࡀ♧၀ࡉࢀࡿࠋ୍᪉ࠊ㻮㼍㻲㼑㻞㻔㻭㼟㻜㻚㻢㻡㻼㻜㻚㻟㻡㻕㻞 䛻䛚䛔䛶䛿䚸䝢䞊䜽ຠᯝ䛿ほᐹ䛥䜜䛺䛛䛳䛯䚹㻌
ᙜ᪥䛿௨ୖ䛾⤖ᯝ䜢䜒䛸䛻ヲ䛧䛔⪃ᐹ䜢⾜䛺䛖䚹㻢㻝㻜㻶 㻔㻭㻛㼏㼙 㻕㻝䠊䛿䛨䜑䛻㻌
㕲䝙䜽䝍䜲䝗⣔㧗 ㉸㟁ᑟయ䛿ẚ㍑ⓗ㧗䛔 㼀㼏 ཬ䜃 㻮㼏䠎䜢䜒䛳䛶䛔䜛䛣䛸䛛䜙䚸ᛂ⏝ୖὀ┠䜢㞟䜑䛶䛔䜛䚹ᐇ⏝ᮦᩱ໬䛾䛯䜑䛻䛿ᙜヱᮦᩱ䛾⮫⏺㟁ὶᐦᗘ䠄㻶㼏䠅≉ᛶ䛾ᢕᥱ䛚䜘䜃㐺ษ䛺䝢䞁Ṇ䜑୰ᚰ䛾ᑟධ䛻䜘䜛㧗 㻶㼏 ໬䛜ᚲせ䛷䛒䜛䚹㻌㕲䝙䜽䝍䜲䝗⣔㧗 ㉸㟁ᑟయ䛾䛖䛱 㻮㼍㻲㼑㻞㻭㼟㻞㻌㻔㻲㼑㻝㻞㻞㻕䛿 㻲㼑䝃䜲䝖䛾 㻯㼛 ⨨᥮䚸㻮㼍 䝃䜲䝖䛾 㻷 ⨨᥮䚸䛒䜛䛔䛿 㻭㼟 䝃䜲䝖䛾 㻼⨨᥮䛻䜘䜚㉸㟁ᑟ≉ᛶ䛜⌧䜜䚸 㼀㼏 ್䛿䛭䜜䛮䜜䛾⨨᥮㔞䛻౫Ꮡ䛩䜛䛣䛸䛜▱䜙䜜䛶䛔䜛䚹୍᪉䚸䛭䛾⮫⏺㟁ὶ≉ᛶ䛻䛴䛔䛶䛿䚸⣔⤫ⓗ䛺◊✲䛜⾜䛺䜟䜜䛶䛔䛺䛔䚹㻌䛭䛣䛷䚸ᮏ◊✲䛷䛿䚸㻯㼛 ⨨᥮ཬ䜃 㻼 ⨨᥮䛧䛯 㻲㼑㻝㻞㻞 ༢⤖ᬗ䛻䛴䛔䛶䚸⮫⏺㟁ὶ≉ᛶホ౯䜢⾜䛔䚸ẚ㍑䜢⾜䛺䛳䛯䛾䛷䚸䛭䛾⤖ᯝ䛻䛴䛔䛶ሗ࿌䛩䜛䚹㻌

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㻲㼕㼓㻚㻟㻌 㻼㼘㼛㼠㼟㻌 㼛㼒㻌 㼟㼏㼍㼘㼑㼐㻌 㼢㼛㼘㼡㼙㼑㻌 㼜㼕㼚㼚㼕㼚㼓㻌 㼒㼛㼞㼏㼑㼟㻌 㻲㼜㻛㻲㼜㻘㼙㼍㼤㻌 㼢㼑㼞㼟㼡㼟㻌㼞㼑㼐㼡㼏㼑㼐㻌 㼒㼕㼑㼘㼐㻌 㼎㻩㻮㼍㻛㻮㼕㼞㼞㻌 㼒㼛㼞㻌 㼍㻌 㻮㼍㻔㻲㼑㻝㻙㼤㻯㼛㼤㻕㻞㻭㼟㻞䠄㼤㻩㻜㻚㻝㻡䠅㻌 㼀㼔㼑㻌㼘㼕㼚㼑㻌㼕㼟㻌㼍㻌㼒㼕㼠㻌㼣㼕㼠㼔㻌㻲㼜㻌㻛㻲㼜㻘㼙㼍㼤㻌㻩㻭㼎㼜㻔㻝㻙㼎㻕㼝㻚㻌 㻌ཧ⪃ᩥ⊩㻌䠍䠊㻌 㻱㻚㻹㻚㻌㻳㼥㼛㼞㼓㼥㻘㻌㼑㼠㻌㼍㼘㻚㻘㻌㻭㼜㼜㼘㻚㻌㻼㼔㼥㼟㻚㻌㻸㼑㼠㼠㻚㻌㻡㻡㻌㻔㻝㻥㻤㻥㻕㻌㻞㻤㻟㻚㻌䠎䠊㻌 㻹㻚㻾㻚㻌㻷㼛㼎㼘㼕㼟㼏㼔㼗㼍㻘㻌㼑㼠㻌㼍㼘㻚㻘㻌㻼㼔㼥㼟㻚㻌㻾㼑㼢㻚㻌㻮 㻡㻤㻌㻔㻝㻥㻥㻤㻕㻌㻞㻤㻢㻟㻚㻌― 96 ―

第83回

2010年度秋季低温工学・超電導学会

1D-p13鉄系超伝導体 (1)㻲㼑㼀㼑㻜㻚㻡㻿㼑㻜㻚㻡 ㉸ఏᑟ⥺ᮦ䛾㟁ὶ㍺㏦≉ᛶ䛸ᚤ⣽ᵓ㐀ほᐹ㼀㼞㼍㼚㼟㼜㼛㼞㼠㻌㼜㼞㼛㼜㼑㼞㼠㼕㼑㼟㻌㼍㼚㼐㻌㼙㼕㼏㼞㼛㼟㼠㼞㼡㼏㼠㼡㼞㼑㻌㼛㼒㻌㻲㼑㼀㼑㻜㻚㻡㻿㼑㻜㻚㻡㻌㼟㼡㼜㼑㼞㼏㼛㼚㼐㼡㼏㼠㼕㼚㼓㻌㼣㼕㼞㼑㼟㻌Resistivity [P: cm]㻌ᑿᓮ㻌 ኖ⣖䠈ฟཱྀ㻌 ၨኴ䠈Ỉཱྀ㻌 ె୍䠈⇃಴㻌 ᾈ᫂䠈㧗㔝㻌 ⩏ᙪ䠄≀㉁䞉ᮦᩱ◊✲ᶵᵓ䠅㻌㻻㼆㻭㻷㻵㻌㼀㼛㼟㼔㼕㼚㼛㼞㼕䠈㻌 㻰㻱㻳㼁㻯㻴㻵㻌㻷㼑㼕㼠㼍䠈㻌 㻹㻵㼆㼁㻳㼁㻯㻴㻵㻌㼅㼛㼟㼔㼕㼗㼍㼦㼡䠈㻌 㻷㼁㻹㻭㻷㼁㻾㻭㻌㻴㼕㼞㼛㼍㼗㼕䠈㻌 㼀㻭㻷㻭㻺㻻㻌㼅㼛㼟㼔㼕㼔㼕㼗㼛㻌㻔㻺㻵㻹㻿㻕㻌㻱㻙㼙㼍㼕㼘㻦㻌㻻㼆㻭㻷㻵㻚㼀㼛㼟㼔㼕㼚㼛㼞㼕㻬㼚㼕㼙㼟㻚㼓㼛㻚㼖㼜㻌㻌㻝䠊䛿䛨䜑䛻㻌㻌
LaFeAs(O,F)䛺䛹䛾㕲䝠⣲໬ྜ≀䛸ẚ㍑䛧䛶 FeSe 䛺䛹䛾
FeTe0.5Se0.5
11 ᆺ㕲⣔㉸ఏᑟయ䛿⤖ᬗᵓ㐀䛜᭱䜒༢⣧䛷䛒䜚ẘᛶ䜒ప䛔䚹䜎䛯䚸ୖ㒊⮫⏺☢ሙ(Hc2)䛜㧗䛔䛣䛸䛺䛹䛛䜙ᛂ⏝䜈䛾ྍ⬟ᛶ䛜ᮇᚅ䛥䜜䜛䚹䛧䛛䛧䛺䛜䜙䚸䛣䜜䜎䛷㕲⣔㉸ఏᑟ⥺ᮦ䛻䛚䛔䛶 transport Jc 䜢ほ 䛧䛯ሗ࿌䛿ᑡ䛺䛔䚹ᡃ䚻䛿䚸㕲䝅䞊䝇䜢⏝䛔䛯 in-situ Powder-In-Tube (PIT)ἲ䛷స〇䛧䛯 Fe(Te,Se)⥺ᮦ䛾㉸ఏᑟ㟁ὶ䛾㏻㟁䛻ᡂຌ䛧䛯[1]䚹䛭䛣䛷௒ᅇ䚸11 ᆺ㕲⣔㉸ఏᑟయ䛾⥺ᮦ໬䜢┠ᣦ䛧䛶 ex-situ PIT ἲ䜢⏝䛔䛶
FeTe0.5Se0.5 ㉸ఏᑟ⥺ᮦ䜢స〇䛧䛯䚹䜎䛯䚸⇕ฎ⌮䛜㉸ఏᑟ≉Fe sheath
200 Pmᛶ䛻ཬ䜌䛩ᙳ㡪䛻䛴䛔䛶᳨ウ䜢⾜䛳䛯䚹㻌㻌
Fig.1 Optical micrograph of the cross section of FeTe0.5Se0.5
wire after heat treatment at 200ºC for 2 h.[2]㻞䠊ᐇ㦂᪉ἲ㻌
FeTe0.5Se0.5 ㉸ఏᑟ⥺ᮦ䛿㕲䝅䞊䝇䜢⏝䛔䛯 ex-situ PIT ἲ䛷స〇䛧䛯䚹㕲䝅䞊䝇䛻ワ䜑䜛 FeTe0.5Se0.5 ⢊ᮎ䛿ᅛ┦཯ᛂ
3ἲ䜢⏝䛔䛶స〇䛧䛯ከ⤖ᬗయ䜢⢊○䛧䛯䚹⢊ᮎ䜢඘ሸ䛧䛯㕲䝅䞊䝇䜢䚸䜎䛪⁁䝻䞊䝹ᅽᘏ䛷䚸⣙ 2.5 mm ゅ䛾䝻䝑䝗䛻ຍᕤ
2.5
䛧䚸䛴䛔䛷䝎䜲䝇⥺ᘬ䛝䛻䜘䜚⣙ 1.1 mm ᚄ䛾䝻䝑䝗䛻ຍᕤ䛧䛯䚹ຍᕤᚋ䚸⣙ 4 cm 䛾▷ᑻヨᩱ䜢ษ䜚ฟ䛧䚸1 atm 䜰䝹䝂䞁䜺䝇2㞺ᅖẼ୰䛷▼ⱥ䜺䝷䝇䛻ᑒධ䛧䛯ᚋ䚸150-500㽅C 䛷 2 ᫬㛫䚸
as-grown⇕ฎ⌮䜢⾜䛳䛯䚹Fig. 1 䛻 200㽅C 䛷 2 ᫬㛫⇕ฎ⌮䜢⾜䛳䛯
1.5
150 C
FeTe0.5Se0.5 ⥺ᮦ䛾᩿㠃ᅗ䜢♧䛩[2]䚹
200 C
250 C
ホ౯᪉ἲ䛿䚸⤖ᬗᵓ㐀䜢 X ⥺ᅇᢡἲ(XRD)䛷䚸䜎䛯㉸ఏ
1300 C
ᑟ ≉ ᛶ 䛿 ≀ ⌮ ≉ ᛶ ᐃ ⿦ ⨨ (PPMS: Physical properties
400 C
500 C
0.5
measurement system)䜢⏝䛔䛶┤ὶᅄ➃Ꮚἲ䛷 ᐃ䛧䛯䚹
FeTe0.5Se0.5㻌wire
Transport Jc 䛾㟁⏺ᇶ‽䛿 1 PV/cm 䛸䛧䛯䚹ᚤ⣽⤌⧊ほᐹ䛿0㉮ᰝᆺ㟁Ꮚ㢧ᚤ㙾(SEM: Scanning electron microscope)䜢⏝
0
5
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20
䛔䛶⾜䛳䛯䚹㻌
Temperature [K]㻌
Fig.2 Temperature dependence of resistivity for FeTe0.5Se0.5㻟䠊⤖ᯝཬ䜃⪃ᐹ㻌
superconducting wires for different annealing temperatures T =FeTe0.5Se0.5 ከ⤖ᬗయ䛿䚸XRD 䛾⤖ᯝ䛛䜙䜋䜌༢┦䜢♧䛧䚸
150-500ºC.[2]㻌
Tconset = 15.7 K ཬ䜃 Tczero = 12.8 K 䜢♧䛧䛯䚹
100
Fig.2 䛻 ex-situ PIT ἲ䛷స〇䛧䛯 FeTe0.5Se0.5 ㉸ఏᑟ⥺ᮦFe(Te,Se) wire䛾㟁Ẽ᢬ᢠ⋡䛾 ᗘ౫Ꮡᛶ䜢♧䛩[2]䚹FeTe0.5Se0.5 䛾⢊ᮎ䜢㕲䝅䞊䝇䛻ワ䜑䛶ຍᕤ䛩䜛䛰䛡䛷䚸3.2 K 䛷䝊䝻᢬ᢠ䛜ᚓ䜙
ex-situ䜜䚸Jc = 2.8 A/cm2 (2 K)䜢♧䛧䛯䚹᭦䛻 200ºC 䛷 2 ᫬㛫䚸⇕ฎ10zero⌮䜢⾜䛖䛣䛸䛷 Tc = 9.1 K 䜎䛷ྥୖ䛧䚸Jc 䛿 2 K ཬ䜃 4.2 K䛷䛭䜜䛮䜜䚸82.5A/cm2 ཬ䜃 64.1 A/cm2 䜢♧䛧䛯䚹䛣䜜䛿䚸⇕ฎ⌮䜢⾜䛖䛣䛸䛷⢏⏺≉ᛶ䛜ᨵၿ䛥䜜䛯䛯䜑䛸⪃䛘䜙䜜䜛䚹䛧䛛䛧䛺䛜䜙䚸Tconset 䛿ከ⤖ᬗయ䛸ẚ㍑䛧䛶 4 K ௨ୖప䛔䚹䛣䜜1
in-situ䛿ᅽᘏຍᕤ䛻䜘䛳䛶 FeTe0.5Se0.5 ⤖ᬗ䛻ṍ䛜ᑟධ䛥䜜䛯䛯䜑䛸᥎ᐹ䛥䜜䜛䚹
Fig.3 䛻 200ºC 䛷 2 ᫬㛫䚸⇕ฎ⌮䜢⾜䛳䛯 FeTe0.5Se0.5 ㉸ఏ@ 4.2 Kᑟ⥺䛻䛚䛡䜛 Jc 䛾☢ሙ౫Ꮡᛶ(4.2 K)䜢♧䛩䚹ẚ㍑䛸䛧䛶
0.1
0
1
2
3
4
5
6
7
8
in-situ ἲ䛷స〇䛧䛯 Fe(Te,Se)⥺ᮦ䛾 Jc 䛾☢ሙ౫Ꮡᛶ(4.2 K)
Magnetic field (T)㻌䜢♧䛩䚹ex-situ ἲ䛷స〇䛧䛯 FeTe0.5Se0.5 ⥺ᮦ䛿 in-situ ἲ䛷Fig.3 Magnetic field dependence of transport Jc at 4.2 K forస〇䛧䛯⥺ᮦ䜘䜚䚸⮬ᕫ☢ሙ䛻䛚䛔䛶⣙ 5 ಸ㧗䛔 Jc 䜢♧䛧䚸Fe(Te,Se) wire using ex-situ and in-situ PIT method.
☢ሙ୰䛻䛚䛡䜛 Jc 䛾పୗ䜒ప䛔䚹௒ᚋస〇䝥䝻䝉䝇䜢ᨵၿ䛧䚸㻌Jc 䜢ྥୖ䛥䛫䜛䛣䛸䛷㕲⣔㉸ఏᑟ⥺ᮦ䛾ᛂ⏝䜈䛾ྍ⬟ᛶ䛜ཧ⪃ᩥ⊩㻌ᗈ䛜䜛䛸ᮇᚅ䛥䜜䜛䚹㻌㻝㻚 㼅㻚㻌 㻹㼕㼦㼡㼓㼡㼏㼔㼕㻘㻌 㼑㼠㻌 㼍㼘㻚㻦㻌 㻭㼜㼜㼘㻚㻌 㻼㼔㼥㼟㻚㻌 㻱㼤㼜㼞㼑㼟㼟㻌 㻞㻌 㻔㻞㻜㻜㻥㻕㻌㻌㻜㻤㻟㻜㻜㻠㻚㻌㻠䠊ㅰ㎡㻌
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SUHVV 㻌㈝(22䞉10227)䛾ຓᡂ䜢ཷ䛡䛶ᐇ᪋䛥䜜䛯䜒䛾䛷䛒䜛䚹
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Jc (A/cm2)o― 97 ―

第83回

2010年度秋季低温工学・超電導学会