ASC!07!06"#$%&'()*#+,-./)01234567897+:;<=>?@ABCDE
Recent Development of Pulse Field Magnetization and Database of Thermal Properties
for HTSC Bulks
Hiroyuki Fujishiro? (Iwate University)
The pulse field magnetization (PFM) technique has been intensively investigated to realize the REBaCuO
superconducting bulk magnet because of the relatively compact and inexpensive setup of the apparatus comparedwith the field-cooled magnetization (FCM). The trapped field BT by PFM is, however, lower than that by FCM due to thelarge temperature rise by the magnetic flux movement. The enhancement of BT over 5 T has recently achieved by amodified multi pulse technique with stepwise cooling (MMPSC). The bulk magnet due to PFM is expected to apply
some engineering fields. In this report, we summarize the recent development of the PFM technique. We also mention
the thermal properties of REBaCuO bulks such as thermal conductivity, thermal diffusivity and thermal expansion andintroduce you the database (http://ikebehp.mat.iwate-u.ac.jp/database.html) opened on the Web site.
"#$#%F"#$%&'(G*#+,-G%&'"#$-HGIJ-KGLMNOG3P'QG3RSQGT3G3UVG34
567897+(Superconducting bulks, Pulse field magnetization, Superconducting bulk magnet, Trapped field, Temperature rise, Thermal
conductivity, Thermal diffusivity, Specific heat, Thermal expansion, Database for thermal properties)

XYPFM aÓxwX"#$€|-‹Œl†‡ˆ‰~ Fp h

1.&'()*

Ô5~ Fv aÕÄÖw×ØaÙ0Žy•2aby"#$€)REBaCuO W"#$%&'(XYZ[\]^+)_`aLMNO)…‰a Jc lÌ

bcde&fgM Jc hIJ-K BT ij)%P'k5l1(4)lYÜÝÞCD)ßàÄ h ISTEC )áâÄ(5))›œŸãYNmYn)oplqrastuvwxyzn){|%}~

WäÂiLMNOaåŽy•æçèXéêmi“Ö…zë

i-H@%&'"#$-HE•)opXY"#$€)•gµ¶§#7\X 2003 ì“Ä*#+,-–í•LMîïa

Ma‚ƒ„Sm…†‡ˆ‰{Ša-‹Œ•IJŽy•2

byð3–í“ÄñÄ“amw—… (6-10) zn)çè•òó

|YNd-Fe-B W•‘-H•’“am)”IJ-K••–Ž

Žy{“ÄY"#$)ôÉLM Ts 2¡¢-K}M Bex •³

y • 2 l | — Y Ž | a - K { ˜ ™ , - š (field cooledõöŽy÷ÀÁ,-š(Modified MPSC; MMPSC)•øùmYmagnetization: FCM)abcY29 K | 17 T •%ŽIJ-Kl•v¥|) PFM aÓúyIJ-K)³•û 3.80 T(11)•Nü

(1)

a˜™m

y BTP=5.20 T )-K•IJŽy•2aýþm…(12,13)zë›)}x*#+-K•¡¢mw-‹•I

œ|XYëµ¶§#7\)stçè•{ŠaY*#+,-›œuvwxy z%&'•žLM Tc (~90 K)Ÿ
…"#$aY1 s ŸŽy…‰|½y2ÚÛuvy

Ju£y*#+,-š(pulse field magnetization: PFM)¤¥)³´)012ÿ!op)¯"5a¼xw#Íyz

…Y%&'¦§¨©ª•pxix…‰a,-«¬l-®|,-$%h&f'(aÓúyð3–í)òóh)*Y&¯°Y±²2iy…‰Y³´qraµ¶uvwxyz·(f+7,)-.YuÄa3o~)./ijaXY"#$%¸¹LM(77 K)º´|XYPFM š)»¼|½y¾¿,-š&'()3P'QY3RSQY3UVij)3Â*017@Iterative magnetizing operation with gradually reduced pulse

8l23|½yz•v¥|a45)"#$%&'()34(2)

field amplitude: IMRA šE hYÀÁÂaLM•ÃilÄ

5îï•6xYWeb N|78mwxy"#$%&'()6*#+-K•¡¢Žy Multi-pulse technique with stepwise

78 97 +(http://ikebehp.mat.iwate-u.ac.jp/database.html)a¼(3)

cooling (MPSC) š ijabcYFCM abyIJ-K BTFC
2ÅÆÇÈ)IJ-K BTP l•–uvwxyzm“mY•x Jc )…‰C—iIJ-KlÉÊ|—y 50 K Ÿ)ËÌ

L|XYBTP X BTFC aTÍwÎÏa-uxzn)ÐiÑÒ

xw¤)9Žy(14) z

2.&+,-./0123,4567829:;2<1=>?@A2BC<*#+,-X•‘-H•,-Ž
1!6

y:š2mwŸ;bc<=vw—…lY•p>?@)"#

lÉÊuvyz´ì)˜{|)}~abcY˜{|˜™)$%&'(•*#+-Kabc,-ŽyëAÂiµ¶XY"#$%&'-H)8ð¤qraiÖw—wxyzSander

1990 ì;{B“ÄÜÝÞCD)ßà§#7\2(C)?D0ÄXx÷aqŽb•aYLM•ÀÁÂaÌ

EF8ðµ¶G|8Huv…z*#+,-•6Ö…2—)Ç€}M)*#+-K•STü¡¢Žy MPSC š•øù,-–í•IJŽy…‰Y*#+-K¡¢Ka"#$(amYIJ-K)1N•›œm…(3) z¥…Y:;ÄX*#+BTP )IJ-K„L2YMIJ-‹N!T )(15))•‚NlcXY•ƒ„Žy:š(20) hY"#$)ã…a†z‡+‡§•g,u£Y3ˆN•n¢u£w"#$)ð3•

R:ÄXSTU)V7#¹W•pxwY*#+-K¡¢{+‡§|‰ŠŽy•2(21) ¤IJ-K)1Na‹èl½y2

aÓúy%&'"#$€|)-‹gM„L)XYÂZö•›œmwxyz

IJuv…-‹¡¢-KOé5•PÍYn)çè• FCM 2TQm…

u£ilÄYîïm…zn)çèYÙ0Žy-‹ŒaX†‡ˆ‰~ Fp )«¬aŒ•Žr•¥¥,-opy*#+,-)•‘•’[a\MaT]ŽyÔ5~ Fv l^—Ynvl"#$€_•“mY?D0EF8ðµ¶G|X%&'"#$-H)e-)-‹Œ)`a•bÃwxy•2•ñÄ“am…(16) zcd

abcü•~•“y%&'”78•[ZmY•#–—7ªÄX†©$e©\f?#•pxwghÂi-‹Œ)MN)

a˜™mwš6u£y•2aýþmwxy(22) z›œ•žCXYÂZö•îïm…z77 K aÓúyWäÂi•æ“ÄYD)ŸTQÂIJ-K)-ux Y W"#$|XY³õi¡¢-K®)”78•8ðm…(23) z•)¥)"#$),-aX”¦•iÍj FCM 2ÅÆÇÈi-‹N•IJ|—y•2l„§—®f?#”2x•¨mx8?\)+\+©ª®*#+f

“Ö…

(17)

zuÄaIJ-K)C—i Sm W"#$akmw

XY&-lmij) yoke •pxy•2|-‹N•nCop

ÄXY"#$(•e-2Žye¡¢£#¤£©\?#•pxwÓcY©p)*#+f?#2Xªiy*#+,-š)¯"5•qm…(24)zy•2•qm…(18) zßàÄXuÄaYÇrLM|-‹Œ•"#${s•`au£…KY¡¢-K•t5auvu£y;2<2=

ST*#+¡¢š@IMRA šE•øùmYyoke + IMRA š,-–í•«)mIJ-K)1N••–ŽyaXYLMî

| Sm W"#$akmw FCM )w 90 %¥|,-Žy•2ïabyð3–í))ñl¬3|½y2ò-Y®¯Âst

(19)

DEFG2HIJ<<ëµ¶§#7\X*#+zx»a IMRA š)yzx•qŽz•6Öw—…zx°a GM ˜{|a^©ªm…%&'"#"#$)LM Ts )ÌLöXYde&fgM Jc l1NŽy

$2,-f?#)±W•qŽz$]1#²f‡+8‡8‡…‰†‡ˆ‰~ Fp=J x B lnCmIJ-Kl1NŽy•2

3&k@Œ³ 76 µmE•´¬ P0µP4 a¶cºúY{Š)aýþm…

LM T0 2ýƒ·¸¹e(Growth Sector Boundaries; GSBs)|º¥v…»¼)ýƒ·¸(Growth Sector Regions; GSRs)){
Š“Ä 9 mm )¼½|)LM T1µT4 )*#+-K¡¢K)
XYOé5•îïm…z"#$ôÉLM Ts @40µ70 KE2¡¢*#+-K}M Bex@3.01 Tµ5.42 TE•Zöu£…zÇr}M)-K*#+•"#$¾¿)LMlôÉLMaü¿m…KYÀ.ÁüÂcÃm¡¢m…@No. 1µNo. 5 pulseEz
IJ-KX PH )´¬(BTP)ÓbÄY"#$¾¿“Ä 3 mmN)÷ÅÆ„L(BT3mm)•V7#^‡>abcîïm…zx»a Ts=40 K a˜™m…!SmBaCuO W"#$• Bex=3.01
x»<IMRA š)yzx
Fig. 1. The schematic concept of the IMRA method.

T ) No. 1 pulse ÓbÄ No. 5 pulse ¡¢K)ÇÈ‘|)LM
Zö T(t)•nvÉvqŽzÊ]-K˜™(ZFC)ËÌ•) No. 1
pulse ¡¢)KÀYT2, T3 l\„•‚NlÖw†7$•

x÷<MPSC š)yzx
Fig. 2. The schematic concept of the MPSC method.

x°<*#+,-aÓúy"#$…Í)yÎx
Fig. 3. Experimental setup around the bulk and pulse coil.
2!6¤arïûa´Ý„zßŸà1•qŽ"T0max 2 BTP )*#70

B =3.01T

T0
T1
T2
T3
T4

ex

1

60

4

0

2

T (K)

3

+-K¡¢üTOé5XáâmwÓcY-K)IJ2LMNOlgãaåämwxy•2•qåmwxyz
xæa SmBaCuO "#$akŽy45) Ts, Bex aÓúy*#+,-aÓxwY"#${Š|)³CLMNO "T0max

No.1

50

• No. 1 ÓbÄ No. 5 pulse )KÀa¼xwqŽzNo. 1 pulseaÓxwXY"T0max X Ts )NO2çaÅÆèPauvŽy
@Tc=92 K |Ê]aiyElYNo. 5 pulse aÓxwX Bex!3.84

No.5

40

T )KÀaX"T0max X=Ü“a†7$•qŽz*#+-K
0

1020
Time (sec)30yzx»<*#+-K¡¢K)"#$¾¿)LMNO
Fig. 4. Examples of temperature rises during PFM.
30

(a)

(T)
P

B

v

<••| Qp X†‡ˆ‰~'(YQv XÔ5~'(YV Xê
F)(ë|½yzC(T)XÇrŒý)êF)3P'Q23R
xïaX No. 1 2 No. 5 pulse akmw/om…ð3N
Q(No.1), Q(No.5)) Ts Oé5•qŽzðïuv…ð3N Q

210XYxæ)"T0max 2X“icªiyLMOé5•qŽzNo. 1

1

2 3 4 5
Pulse NumberpSQ)Çr^©ìí‡§îï“Ä C=#/$abcî‰…(14) z

3

T

(K)

40K,3.01T
40K,4.64T
60K,3.01T
60K,4.64T

20

1

(1)

" C(T)VdT = Q + Q
Ts

(b)

max

!T0

Ts +! T0max

Q=

5
4

0

¡¢abyð3N Q XGÅé•pxw/oŽy•2lop

0pulse aÓxw Q XYBex lC—xKÀaX Ts )NO2çauvŽylYBex l-uxKÀaX†7$•qm Tc |Ê]1

2 3 4 5
Pulse NumberxÁ<LMNO2IJ-K)*#+¡¢üTOé5
Fig. 5. Pulse number dependence of maximum temperature rise
"T0max and trapped field BTP.

2iyz•vakm No.<5 pulse aÓxwXY†7$•q
Žà1@dQ/dTs>0 )à1Elbcñò|½yzxÁ(b)bcY
IJ-K BTP Xj)KÀ|¤ No. 3 pulse ŸóXßŸmwxy)|YNo. 5 pulse aÓúyð3 Q(No.5)XG-K)IJ2
åäŽy†‡ˆ‰'( Qp lÎÏa-u„YÅ2rjl-’€YÅx| T4, T1Y³Ka T0 l•‚Nlyz•)b•i‹)Ù0aby'( Qv 2ò-w`x(Q(No.5)=Qv)z¤m Qv

KGabyLMoÏ)ÐxXY-‹l"#$€|de&f

l-K*#+)}Mh"#$)LMaOémix2ôïŽ

gM Jc )ÌxKG“ÄiÑÂa`amY•)_„|-‹`y2Y"Q=Q(No.1)-Q(No.5)X No. 1 pulse akŽy†‡ˆ‰aakŽy¾¿"+e•ÒÓmð3mwxy•2•qmw~'( Qp 2ò-y•2lopy("Q=Qp)z•)b•aÇr

BT3mm “ÄYLMNOlC—*#+¡¢)KÀ)ð3N Q ))*“Ä Qp 2 Qv )„½lxyzÔaxaqŽ-K„L

x P2, P3 |-KlIJuvwxy•2l„“yzÇr}M¯"aiÖ…z)*#+-K•Áü¡¢K(No. 5 pulse)|XLMNOXÌu

40(a) No1ŽyzBex lC—„iy2Y-‹)`aakŽyŽÍw)¾

B =3.01T¿"+elÕÓmY"#$…Í“ÄÅÆhÈa-‹l`a¥|}aŽy…‰Y—vxiØÙË)IJ-K„L•qŽz•)b•aY"#$€) Jc )Úhr52-KIJ„L•¾Ûmwð3„Ll’€wxy•2l„“yz
xÁa Ts=40 K 2 60 K | Bex=3.01 T 2 4.64 T )*#+K• ¡¢m …KÀ )Y" #$ {Š(P0) |)³ CLM NO"T0max 2IJ-K

BTP )*#+-K¡¢üTOé5•qŽzxÜv)KÀ¤ No. 1 pulse |)LMNO"T0max l³¤
C—„Y-K¡¢üT)n¢22¤a"T0max Xuvmrïûa´Ý„z"T0max X"#$LM Ts lÌxÅjC—„¡¢-K Bex lC—xÅjC—xzIJ-K BTP X No. 1 pulse

3.84T
4.64T
5.42T

(K)
max

l×Ävixz]-j Bex=4.64 T |) BT3mm X-‹l{Š

ex

30

!T0

mYnvakom…ð3lÖ•c T1(t)µT4(t)aC—iÐx(b) No5

20

10

0

40

50
60
T (K)
s

70

40

50
60
T (K)

70

s

xæ<45) Ts, Bex aÓúy"#${Š|)³CLMNO"T0max@No. 1 ÓbÄ No. 5 pulseE
Fig. 6. The maximum temperature rise "T0max for various Bex and
Ts (No. 1 and No. 5 pulses).

|³Þû) 80 %ŸNlIJuvY-K¡¢üT)n¢22

3!6

800

(a) No1

B =3.01T(b) No5

ex

3.84T
4.64T
5.42T

Q (J)

600

400

200

0

40

50
60
T (K)

70

40

s

50
60
T (K)

70

s

xï<ðïð3N Q@No. 1 ÓbÄ No. 5 pulseE
Fig. 7. The estimated generated heat Q for various Bex and Ts(No.1 and No.5 pulses).

xú<MMPSC š)yzx
Fig. 8. The schematic concept of the MMPSC method.
6
Pulse Field Magnetization (PFM)
MMPSC
Pre-record;2<3= MMPSC K*LMNO6P:Q<<%&'"#$(T)

M Ts )ÌLö|½yz•¥Y•v¥|a›œm… Ts=40 K

P

MMPSC

B

4

IMRA method (T=30K)

l“Ävwxyzm“möiy Ts )ÌLöXY†‡ˆ‰~)nCabyð3@†‡ˆ‰'( Qp E)n¢2YT3 C)uvabyLMNO)n¢l½cY*#+,-š|Xèiy"#$)ÌLöX“÷|Xixz<òøX•v¥|)rù)•æ“ÄYTQÂ•xLM|K•½y%MIJu£w†‡ˆ‰'( Qp •ÌumYn)(with SUS ring)T

aIJuvy-K•nCu£y õ ¼):šXY"#$)LŸN|)çèaÓxw¤ Ts lÌxÅjC—iIJ-K BTP

Iwate Univ.

5

SPA(T=20K)
SPA(T=40K)

3
2004

2005
Years

2006

x'<PFM šabyIJ-K1N)ðž
Fig. 9. Records of BTP by the PFM technique.

K†‡ˆ‰~)C—xÌL|*#+-K•¡¢ŽvjY‹lIJuvwxixÌLËÌ•*#+-K•¡¢ŽyK

Bex1=4.80 T)•¡¢m…KÀY"#${Š(C)bc¤…Í_(E)ÀaTÍð3•Ìu|—wIJ-K BTP lnC|—y2ò

lbc*„)-‹•IJmwxy@•X•)IJ-K„L-Y"#$)LM Ts 2¡¢-K}M Bex •³õöŽy÷À

@+¿,ËX M -®Elû÷ÀÁ)IJ-K1NaX¬3

Á,-š(MMPSC š)•øùm…zxúayzx•qŽz|½yE
zNo. 3 pulse ((Ts2=28 K, Bex2=6.73 T)•¡¢m…K

MMPSC š X Y û » À Á | " #$ • T Q Â • L ü ] - jÀaX@x 10(b)EY-K„LX{ŠÅj}xØÙ®aicY

Ts1=45 Ký a ˜ ™ m w Y T Q Â þ x * # + - K ü ] - j{Š| BTP=5.20 T •IJm…zBex2=7.01 T )KÀaXð3

Bex1=4.5 Tý•÷ü¡¢mwY"#${Šaw 1 T )-K•

aby Flux jump lÖ•c-Kl.ÃYBex2=6.04 T )KÀ

IJu£yzÅaû÷ÀÁ|"#$•uÄaÌL(Ts2=28 K)aX/„a-‹l`amix•2l„“cYBex2 )³õöa˜™mY³õi}x*#+-K(Bex2=6.7 T)•÷ü¡¢Ž¤¬3i01|½y•2lñÄ“aiÖ…z¥…Yû»Àyzû»ÀÁaÓúyvN)-‹)IJlYû÷ÀÁ)-Á(Ts1, Bex1)|) M -®-K„Ll-uxKÀhØÙ®aK¡¢|)LMNO•ÌumYû÷ÀÁ)†‡ˆ‰~)},-m…KÀaXYû÷ÀÁ(Ts2, Bex2)|)IJ-KXnC

xÌL|bc}x*#+-K)¡¢abcIJ-K•1N

mix•2¤„“Ö…zMMPSC šX[)%&'"#$au£y¤)|½yz•):š•pxw 2005 ì 2 ÿaYkmw¤(‹i*#+,-š|½y•2•23mwxyz

GdBaCuO W"#$@¨!"@CEF#³ 45mm, $u 20mmE#³ 45 mm )%&'"#$• Ts=30 K | FCM abc,-¾¿| BTP=4.47

ŽyKÀaXY}x&-~akŽy"#$)|4Â}M)T )-KIJaýþm…zuÄa 7 ÿaYÇ€"#$a+ì‡%+[+‡§•«,mC‹èabc BTP=5.20(21)

Y3ˆN)nT •&ým…zx'a•v¥|)I56“Ä 7~8 T lIJ7e28=vwxyz9ü)çèXY
:;< abyIJ-KlrÀ2 FCM a´Ýx…28-yz

J-K1N)ðž•qŽz•)b•i÷ÀÁ)*#+,šlY•v¥|) PFM aÓúyIJ-K)³•û 3.80 T;2<4= ./0R,S+,-6TUV2WX<<ŸN#Í•Nüy•x-K•IJŽy(‹i:š|½y•2lñÄ

w—…%&'"#$-HXY»=)˜{||»U)"#$“aiÖ…z-Hm“•–|—ÜY"#$-H)-Ë¤>¿m“•p|<x 10 a GdBaCuO "#$•pxw BT=5.20 T •IJm…

—i“Ö…z"#$-H)op?º•@‰yaXYAË¥2—)Y¡¢-K µ0Ha(t)2"#$¾¿°—G(C: center, M:…X¿ËaSTUBAm…¦#C"#$-H•8ðl23

middle, E: edge)))G-K BL(t)•qŽzNo.1 pulse!(Ts1=47 K,|½yzm“mY¦#C"#$-H•-K{˜™š|•–

4!6

8

2
µ0Ha
BT(M)

yoke

coil

3

SUS ringa0BT4mm (T)

yoke

4

front

0

BT(E)

bulk

5

1

BT(C)

L

µ H , B (T)(a) pulse No. 1
7
T =47K, B =4.80Tsex
6

T C ME

SmBaCuO

0
back

2

-1

1

-2

0

0

T =28K, B =6.73T
s

150

ex

B (C)
L

5

0

a

L

µ H , B (T)

6

50
100
Distance (mm)x 12<¦#C"#$-H)-K„L2-Ëa‰,m…mN
Fig. 12. The line scan profiles of the BT4mm value on both “front”
and “back” surfaces and photograph of the iron balls attracted on
the magnetic pole surfaces.

(b) pulse No. 3

7

YBaCuOB (M)

4•,-KY+\+©ªf?#•Å)"#$•ž0m PFM

L

3•6•)|YÑ«Nx„¼|¤,-l¯"|½yz

2

x 12 a÷U)"#$a³õi,-•6Ö…K)-K„L

B (E)
L

•qŽzHOˆP¾¿|³C 2.0 T )-K•23mY¾Q

10ÅÆÇri-K„L•“y•2lop…z•)R¿•pi
0

20

40
60
Time (ms)80100x 10<MMPSC šaÓúy¡¢-Kµ0Ha(t)2)G-K BL(t))XYOé5 (No. 1 and No. 3 pulse)
Fig. 10. The time dependences of the applied field µ0Ha(t) and the
local fields BL(t) at positions C, M and E for the (a) No. 1 pulseand (b) No. 3 pulse applications..

"#$-H)op•–êstmwxyz

Y.&+,-./012Z[J\#]^#4;3<1=

FGUV_FG`a<<REBaCuO W"#$%&'()%}~-Hh&f+7,2mw)opaÓxwY
3P'Qh3UVij)3Âk5l¬3i*01782iŽyaXCD³)%&'¦§¨©ªl23|½c(25)YAË

yzREBaCuO W"#$XYRE123 %&'SYRE211 Î%aEr•"#$-H),-XÚ¯"|½Ö…zòøÄXS&'SYAg, Pt ij“ÄiySÀEF|½cYn)3Â5TU)"#$• ab ¿:1“Ä˜™mY+\+©ª®)*

TX RE Æ¹)4áYRE123 S)%&'5hB15Yn)#+f?#•pxw"#$) c F:1a-K•¡¢ŽyB[)S)U(Nh„SËÌijabcYŽi=‚êFZ[

š@"ab-plane cooled type"E•øùmY#³ 45<mm )"#01abcVkûYLMOé52¤C—„ªiyzx„¼$•÷UB¬m…÷ù®%&'"#$-H•êZm…

“);¾Âi"#$(a¼xw)3Â5T)›œX½y(26,27)zx 11 a"ab-plane cooled type""#$-H)yÎx2

lYêFZ[01akŽyWäÂiîïçèXÎÏavi

•¥)«¬)GH•qŽz•)B¬|XY÷U)"#$X

xzëµ¶§#7\|X·(W+XD•pxÜaY4µ300 K

ab ¿@I¿E:1“ÄHJ_E|K‰ºúYHJ_E•˜)LM?º|Y0µ10 T )-K?º|êF)3P'Q#Y3{|)f7#,+ì7La3ÂaãMm…z»¼)"#$

RSQ$Y3Ö&~ SY3UV dL/LYT3 CYY\ Vs •Z[\0|îïŽy345îï«¬•8ðmYw 50 4á)

x 11<¦#C"#$-H«¬)yÎx
Fig. 11. The experimental setup around the bulks and the splittype coil ("ab-plane cooled type" system).

x 13<-K{345îï«¬)yÎ
Fig. 13. The thermal property measuring system at lowtemperature and under magnetic field.
5!6

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8•8Hm…z•)67897+)k]XYèiyîï6-wxyz78)^A|Xi„YêFS_)åäl„“yb•i`ø250
RE123:RE211=100:40

ù®67897+a2mw¥2‰wxy‘a½yzx 13
200;3<2= bcdefg<< •v¥|aîïm…ÇŸb!
(DOWA)Y¨!ë["(NSC)Y%&'cDµ¶G(ISTEC))
Z[m…"#$E)ŒýY4áYîï:1È•¾»aqŽz! (mW/cmK)aîï«¬)yÎ•qŽzk]Âiîïçèa¼xwdèa¥2‰yzx 14 a;¾Ag10wt.%
RE=Gd(NSC)
RE=Y(DOWA)
RE=Sm(DOWA)
RE=Dy(ISTEC) !

150

ab

100
50

Âi"#$)3P'Q)LMOé5•qŽ(14)zab ¿€2 c

!

c

0
0

F:1)3P'Q)ª:5l eµõf %MéêŽyzRE Æ

100)…‰|½y•2lñÄ“aiÖwxyz¥… Dy WX Sm

x 14<REBaCuO "#$)3P'Q
Fig. 14. The thermal conductivity of various REBaCuO bulks.

W2Ç±a3P'QlÌ„YCi{|ýƒ|—yij•‘(28,29)zAg j¢abc3P'QX ab ¿€Yc F:12¤nCŽyz¥…Y211 kW)U(N)n¢abc3P'QX
uvmYÇ€ 211 j¢N|¤ 211 kW)>?@l-u„iy23P'QlÌuŽylY•vXkeSl)nC2òy•2lopy(30,31)z
x 15 a Sm W"#$(Sm123:Sm211=100:20)) Ag j¢
Naby3Šm dL/L )LMOé5•qŽ(32)zdL/L X ab ¿€2 c F:1|Xw÷n)ª:5léêŽyz3Šm@U
VElC—x Ag )j¢N)n¢abc dL/L lnCmY3
Šm@UVEl-ux RE211 SU(N)n¢abc dL/LluvŽy•2lWäÂaPÍÄvwxy(32)z0Thermal Dilatation dL(T)/LlC—x…‰Yka&f+7,•)oplstuvwxy

300

T (K)

¹)Ðxabck]ÂiLMOé5•qŽlYka Sm W
|3P'Ql-ux)X Ba-Sm ¬gabyçh5)Ì

200

SmBaCuO (Sm123:Sm211=1.0:0.2)(DOWA)

ab-plane-0.001-0.002c-axis
Ag=15wt.%
Ag=10wt.%-0.003

Ag=10wt.%
Ag=15wt.%
Ag=19.7wt.%

Ag=19.7wt.%-0.0040pure Ag

100
200
Temperature (K)300

x 15<SmBaCuO "#$)3Šm dL/L@Ag j¢NOé5E
Fig. 15. The thermal dilatation dL/L of SmBaCuO bulks forvarious contents of Ag.

2004 ì 2 ÿ“Ä Web N|)78mwxy345678
97+XYïÉÂa¨mx678•o¢mwxyz2006 ì¾»<34567897+aŠsuvwxy%&'"#$)4á2Œý
Table 1. Specifications of the bulk samples of which the thermal properties were measured.
Company & InstituteRE element(123):(211)=100:X

Ag content (wt.%)

Measuring direction

Y

X=33µ400µ15

ab and c

DOWA

Sm

X=10µ40

0µ20

ab and c

Gd

X=40

10µ15

ab and cY

X=0µ330

ab and c

Gd

X=33~50

10ab and c

Dy

X=33

0

ab and c

Nd

X(422)=20µ30

0µ10

ab

Gd

X=50

0µ30

ab

Dy

X=5µ40

0µ10

ab

Ho

X=40

10

ab

(Nd,Eu,Gd)

X=11µ43

0µ20

ab

NSC

ISTEC

h&&&i
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