2011A1766     BL28B2

REBCO㻔RE=Y, Dy and Gd㻕ࢥ࣮ࢸࢵࢻࢥࣥࢲࢡࢱ࣮࡟࠾ࡅࡿᚤ⣽཮ᬗࡢᐃ㔞ᵓ㐀ゎᯒ࡜㉸ఏᑟ⮫⏺㟁ὶ࡜ࡢ┦㛵ࡢゎ᫂Precise Structure Analysis of Micro Twins in REBCO (RE= Y, Dy and Gd)
Coated Conductors and Its Correlation withSuperconducting Critical Current㛗ᮧ ග㐀 a, Ⳮⵦ ᩗஂ b, ᱒ᒣ ᖾ἞ c, Ἑཎ ᩄ⏨ d, Ⳣ㔝 ᮍ▱ኸ e, ⏫ᒇ ಟኴ㑻 f, ᅵᒇ ె๎ g
Kozo Osamuraa, Takahisa Shobub, Koji Kiriyamac, Toshio Kawaharad, Michinaka Suganoe,
Shutaro Machiyaf, Yoshinori Tsuchiyaga㻔බ㈈㻕ᛂ⏝⛉Ꮫ◊✲ᡤ, b㻔⊂㻕᪥ᮏཎᏊຊ◊✲ᶵᵓ, c㻔୍㈈㻕⥲ྜ⛉Ꮫ◊✲ᶵᵓ, d ୰㒊኱Ꮫ,e㧗࢚ࢿࣝࢠ࣮ຍ㏿ჾ◊✲ᶵᵓ, f ኱ྠ኱Ꮫ, g㻔⊂㻕≀㉁ᮦᩱ◊✲ᶵᵓ
a
 RIAS, bJAEA, c CROSS, dChubu University, e KEK, f Daido University, g NIMSᨺᑕග࡟REBCO ࢥ࣮ࢸࢵࢻࢥࣥࢲࢡࢱ࣮୰ࡢᚤ⣽཮ᬗ⤌⧊ࡀᙎᛶⓗᛶ㉁࡟ཬࡰࡍᙳ㡪ࢆㄪ࡭ࡿࡓࡵࠊࡼࡾ㉸㟁ᑟᒙ୰ࡢṍࡢ⢭ᐦ ᐃࢆ⾜ࡗࡓࠋ㉸㟁ᑟᒙ୰ࡢṍࡣ⇕ṧ␃ṍ㻔AT㻕࡜እ㒊࠿ࡽࡢᘬᙇṍ㻔A㻕࡟ᛂ⟅ࡍࡿ᱁Ꮚṍ㻔A400, A040㻕ࡢ࿴࡜ࡋ࡚⾲ࡉࢀࡿࠋᚤ⣽཮ᬗࡢ<100>᪉ྥࡀᘬᙇ᪉ྥ࡟ᖹ⾜࡞ሙྜ࡟ࡣ
㻔a㻕 ᱁Ꮚṍ࡜ᘬᙇṍࡢẚࡘࡲࡾ A400/A ࡣ A040/A ࡼࡾ኱ࡁ࠸ࠊ㻔b㻕 A400/A ࡜ A040/A ࡢ୧᪉࡜ࡶ㸯ࡼࡾᑠࡉ࠸ࠊ㻔c㻕 Poisson ẚࡣ⌮ㄽ࠿ࡽᮇᚅࡉࢀࡿࡼࡾ኱ࡁ࡞್࡜࡞ࡿ➼ࡢ⯆࿡࠶ࡿ⤖ᯝࡀᚓࡽࢀࡓࠋ
࣮࣮࢟࣡ࢻ㸸 ㉸㟁ᑟࠊ཮ᬗࠊ᱁ᏊṍࠊⓑⰍ X ⥺⫼ᬒ࡜◊✲┠ⓗ㸸ᮏ◊✲࡛ᑐ㇟࡜ࡍࡿ REBa2Cu3O6+d㻔REBCO㻕」ྜࢥ࣮ࢸࢵࢻࢥࣥࢲࢡࢱ࣮࡟࠾࠸࡚ࡣ㧗 ࡛ࡢṇ᪉ᬗࡀ෭༷㐣⛬࡛ᩳ᪉ᬗ࡟┦㌿⛣ࡍࡿ㝿࡟ࠊṍ࢚ࢿࣝࢠ࣮ࢆᴟᑠ໬ࡍࡿࡓࡵ micro twin㸦ᚤ⣽཮ᬗ㸧ࡀⓎ⏕ࡋࠊ཮ᬗ⏺㠃࡛ࡢ⤖ᬗࡢ஘ࢀࡣ㔞Ꮚ☢᮰ࡢࣆࢽࣥࢢ࡟ᐤ୚ࡍࡿ࡞࡝㉸㟁ᑟ≉ᛶ࡬኱ࡁ࡞ᙳ㡪ࡀ࠶ࡿࡓࡵࠊࡑࡢⓎ⏕ᶵᵓࠊᙧែ➼ࢆᐃ㔞ⓗ࡟ண ࡍࡿᚲせᛶ࡟㏕ࡽࢀ࡚࠸ࡿ[1,2]ࠋࡑࡇ࡛௒
ᅇࡣ୺࡜ࡋ࡚ 2 ✀㢮ࡢࢥ࣮ࢸࢵࢻࢥࣥࢲࢡࢱ࣮࡟ࡘ࠸࡚⇕ṍ࠾ࡼࡧᘬᙇⲴ㔜ୗ࡟࠾ࡅࡿྛᡂศࡢᅇᢡ⥺࠿ࡽᅇᢡṍࠊᅇᢡᙎᛶᐃᩘࢆồࡵࠊᕧどṍ㸦ఙࡧィࡢ♧ࡍ್㸧࡜ᅇᢡṍࡢẚࠊ㍈᪉ྥ࠾ࡼࡧᖜ᪉ྥࡢᅇᢡṍࡢẚ㸦Poisson ẚ㸧ࢆồࡵࠊ⪃ᐹࢆ⾜ࡗࡓࠋᐇ㦂㸸ᮏᐇ㦂࡛⏝࠸ࡓヨᩱࡣ SuperPower ࡢ YBCO ࠾ࡼࡧ KERI ࡢ SmBCO coated conductor ࡛࠶ࡗࡓࠋᐇ㦂ࡣ BL28B2 ࣅ࣮࣒ࣛ࢖ࣥ࡟ᘬᙇヨ㦂⿦⨨ࢆ⤌ࡳ௜ࡅࠊࢸ࣮ࣉ≧ヨᩱ࡟ᘬᙇⲴ㔜ࢆ༳ຍࡋ࡚ࠊ
ࡑࡢ≧ែ࡛ᘬᙇ㍈᪉ྥ࠾ࡼࡧᶓ᪉ྥࡢ㉸㟁ᑟᒙࡢ᱁Ꮚᐃᩘࡢ⢭ᐦ ᐃࢆ⾜ࡗࡓࠋ࢚ࢿࣝࢠ࣮⠊ᅖ30㹼150 keV ࡢⓑⰍ X ⥺ࢆ 2T = 8o ࡟㓄⨨ࡋࡓ Ge ᳨ฟჾ࡛ᅇᢡ X ⥺ࢆィ ࡋࡓࠋヨᩱ࠿ࡽศ㞳᥇ྲྀࡋࡓ YBCO ࠾ࡼࡧ SmBCO ⢊ᮎ࠿ࡽࡢ᱁Ꮚᐃᩘࢆ↓ṍ࡛ࡢ್࡜ࡋ࡚ࠊࢸ࣮ࣉ≧ヨᩱ࠿ࡽࡢ᱁Ꮚᐃᩘ࡜ࡢᕪ࠿ࡽṍࢆ⟬ฟࡋࡓࠋ⤖ᯝ࠾ࡼࡧ⪃ᐹ㸸SuperPower ♫ࡢ YBa2Cu3O6+d㻔YBCO㻕ⷧ⭷࡟ࡘ࠸࡚ࡢ⤖ᯝࢆᅗ 1 ࡟♧ࡍࠋ༳ຍࡋࡓᘬᙇṍ A=0 ࡢ࡜ࡇࢁ࡛♧ࡉࢀࡿ⇕ṍࡣᅽ⦰ᛶ࡛࠶ࡿࡇ࡜ࡀࢃ࠿ࡿࠋ㻔040㻕,㻔400㻕ࡢ㠃㛫㝸ࡢ༳ຍṍ౫Ꮡᛶࡣࢸ࣮ࣉ㍈᪉ྥ࡛ࡣ༳ຍṍ 0.3%ࡲ࡛࡯ࡰ┤⥺࡛࠶ࡾࠊࢸ࣮ࣉᶓ᪉ྥ࡛ࡣ 0.5%௜㏆ࡲ࡛┤⥺㛵ಀࡀಖࡓࢀ࡚࠸ࡿࠋࡇࡢ┤⥺㒊ศࡢ໙㓄ࡘࡲࡾ Ahkl/A ࢆ⾲ 1 ࡟♧ࡍࠋ㻔040㻕ࡢ໙㓄ࡣ㻔400㻕ࡢ໙㓄ࡼࡾᑠࡉࡃࠊࡉࡽ࡟࡝ࡕࡽࡢ໙㓄ࡶ㸯ࡼࡾᑠࡉ࠸ࠋ୍᪉ᶓ᪉ྥࡢ໙㓄ࡣ-0.32 ࡛࠶ࡗࡓࠋࡇࡢࡇ࡜ࡼࡾ Poisson ẚࡣ 0.35㹼0.38 ࡟࡞ࡗࡓࠋKERI ࡢ SmBa2Cu3O6+d 㻔SmBCO㻕ⷧ⭷࡟ࡘ࠸࡚ࡶ⾲ 1 ࡟♧ࡍࡼ࠺࡟ྠᵝ࡞⤖ᯝࡀᚓࡽࢀࡓࠋ

ᅗ 1 SP YBCO/Cu ࢸ࣮ࣉ࡟࠾ࡅࡿ㉸㟁ᑟᒙ୰ࡢᅇᢡṍࡢᘬᙇṍ౫Ꮡᛶ ࢸ࣮ࣉ㍈᪉ྥࡢ໙㓄ࡀ 1 ࡼࡾᑠࡉ࠸ࡇ࡜ࡀ Y ࡜ Sm ࡟⣔ࡀኚࢃࡗ࡚ࡶྠᵝ࡛࠶ࡿࡇ࡜ࡀ☜ㄆࡉࢀࡓࠋࡇࢀࡽࡢヨᩱ࡛ࡣᚤ⣽཮ᬗࡢ<100>㍈ࡀࢸ࣮ࣉ㍈࡟ᖹ⾜࡛࠶ࡿࠋReuss ࡢ᮲௳࡛ࡇࡢᚤ⣽ᵓ㐀࡟ᑐᛂࡍࡿᛂຊ ṍࡢᛂ⟅㛵ಀࢆᐃᘧ໬ࡋ⪃ᐹࡋࡓ࡜ࡇࢁࠊ཮ᬗ⏺㠃ࡀຊᏛⓗ࡟㌾ࡽ࠿࠸≧ែ࡟࠶ࡿࡇ࡜ࡀ᥎ᐃࡉࢀࡓࠋPoisson ẚࡣᐇ㦂ⓗ࡟ 0.24 ࠿ࡽ 0.38 ࡢ⠊ᅖ࡟࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࡀࠊᮏ᮶ YBCO ࡢ Poisson ẚࡣ⌮ㄽⓗ࡟ 0.12㹼0.14 ࡛࠶ࡿࡇ࡜ࡀᮇᚅࡉࢀ࡚࠸ࡿ[3]ࠋࡇࡢࡇ࡜ࡼࡾࢥ࣮ࢸࢵࢻࢥࣥࢲࢡࢱ࣮࡛ࡣୗᆅຠᯝ࡟ࡼࡾኚᙧࡀ┦ᙜᣊ᮰ࡉ࡚࠸ࡿࡇ࡜ࡀ᥎ᐃࡉࢀࡓࠋ ௨ୖ௒ᅇࡢᐇ㦂࡛ࠊ⇕ṍࢆṇ☜࡟ホ౯ࡍࡿࡇ࡜ࠊᘬᙇ㍈᪉ྥ࡜ᶓ᪉ྥࡢࢹ࣮ࢱࢆᚓࡿࡇ࡜࡟ࡼࡾࠊᚤ⣽཮ᬗࢆྵࡴ㉸㟁ᑟᒙࡢຊᏛ≧ែࢆᐃ㔞ⓗ࡟ホ౯ࡍࡿ㊊᥃࠿ࡾࢆᚓࡿࡇ࡜ࡀ࡛ࡁࡓࠋ⾲ 1 ྛᅇᢡ㠃࠿ࡽᚓࡽࢀࡓᅇᢡṍ࡜ᘬᙇṍࡢẚ㸦ึᮇ໙㓄㸧࡜ Poisson ẚ௒ᚋࡢㄢ㢟㸸ᮏ◊✲࡛ᑐ㇟࡜ࡍࡿ REBa2Cu3O6+d ࢥ࣮ࢸࢵࢻࢥࣥࢲࢡࢱ࣮࡟࠾࠸࡚ࡣᚲ↛ⓗ࡟ micro twin㸦ᚤ⣽཮ᬗ㸧ࡢⓎ⏕ࡍࡿࡇ࡜ࠊࡑࡢⓎ⏕ࡢ࣓࢝ࢽࢬ࣒ࠊᙧែ➼ࢆᐃ㔞ⓗ࡟ண ฟ᮶ࡿࡼ࠺࡟ࡍࡿࡇ࡜ࡀ┠ⓗ࡛࠶ࡿࠋᮏࢥ࣮ࢸࢵࢻࢥࣥࢲࢡࢱ࣮ࡣ㔠ᒓᇶᯈୖࡢ㓄ྥᛶ㓟໬≀ࣂࢵࣇ࢓࣮ᒙ࡟ཌࡉ 1 ࣑ࢡ࣓࣮ࣟࣥࢱ⛬ᗘࡢ㉸ఏᑟᒙࢆ⤖ᬗᡂ㛗ࡉࡏࠊࡉࡽ࡟ⷧ࠸㖟࢟ࣕࢵࣉᒙࡀ௜ࡅࡽࢀ࡚࠸ࡿࡢ࡛ࠊ⤖ᬗᡂ㛗ᚋࡢ෭༷㐣⛬࡛㉸ఏᑟᒙ࡟Ⓨ⏕ࡍࡿ⇕ㄏ㉳ṧ␃ṍࡣ」ྜᵓ㐀࡟౫Ꮡࡋ࡚」㞧࡛࠶ࡿࠋࡇࡢṍࡢ 2 ḟඖศᕸࢆṇ☜࡟ィ ࡋࠊᚤ⣽཮ᬗ࡟ᑐࡍࡿࣔࢹࣝィ⟬࡛ᚓࡽࢀࡿṍศᕸࡢᑐᛂ㛵ಀ࠿ࡽ཮ᬗⓎ⏕ࡢᶵᵓࢆゎ᫂ࡍࡿࠋࡍ࡞ࢃࡕ㠀ᖖ࡟ⷧ࠸ᚤ⣽㡿ᇦ࡛ࡢṍ ᐃࡀᚲせ࡞ᮏ◊✲࡛ࡣ㧗㍤ᗘࡢⓑⰍᛶࡢᨺᑕගࡢά⏝ࡀ୙ྍḞࡢ◊✲ᡭἲ࡛࠶ࡾࠊ௒ᚋᮏ◊✲ᡭἲࢆⓎᒎࡉࡏࡿࡇ࡜ࡣࠊṍࡢᐃ㔞ⓗホ౯࡜⮫⏺㟁ὶࡢṍ౫Ꮡᛶࡢ㉳※ࢆ᥈ࡿࡇ࡜࡟኱ࡁࡃᐤ୚ࡍࡿࡶࡢ࡜⪃࠼ࡽࢀࡿࠋࡇࡢ

ࡇ࡜ࡣᕤᴗⓗほⅬ࠿ࡽࡶᐃ㔞ⓗ࡟ࠕṍࡢホ౯ࠖࡀྍ⬟࡟࡞ࡿࡢ࡛ࠊࠕṍࡢ⟶⌮ࠖࢆཝᐦ໬ࡍࡿࡇ࡜ࡀྍ⬟࡜࡞ࡾࠊࡑࡢᕤᴗⓗ࡞࣓ࣜࢵࢺࡣᴟࡵ࡚኱ࡁ࠸࡜⪃࠼ࡽࢀࡿࠋཧ⪃ᩥ⊩㸸
[1] 㛗ᮧග㐀ࠊ⏫ᒇಟኴ㑻ࠊᅵᒇె๎ࠊࣁࣝࣚ ࢫࢸࣇ࢓ࣥࠊ㕥ᮌ⿱ኈࠊⳭⵦᩗஂࠊ᱒ᒣᖾ἞ࠊⳢ㔝ᮍ▱ኸ㸹YBCO Coated Conductor ࡟࠾ࡅࡿᒁᡤṍ࡜཮ᬗᵓ㐀ࡢ┦㛵, ➨ 82 ᅇ 2010 ᖺᗘ᫓Ꮨప ᕤᏛ࣭㉸㟁ᑟᏛ఍ㅮ₇ᴫせ㞟 16, 㻔2010㻕.
[2] K. Osamura, S. Machiya, Y. Tsuchiya, S. Harjo, H. Suzuki, T. Shoubu, K. Kiriyama and M. Sugano,“Internal Strain Behavior Exerted on YBCO Layer in the YBCO Coated Conductor”, IEEE Trans. Appl.
Supercond. Vol.20 pp3090-3093, 㻔2011㻕.
[3] S. Machiya, K. Osamura, T. Shoubu, K. Kiriyama, M. Sugano and K. Tanaka, “Macroscopic Elastic
Constant Analysis and Strain Behavior of Crystal on YBCO Layer in YBCO Coated Conductor”
TEION KOGAKU 㻔J. Cryo. Soc. Ipn㻕vol 45, pp 233 – 236, 㻔2011㻕