ðà
­¥êºÌ¬´q¿óyÞ»¨É¨¯éX üzû¥C~ñF«¬JÍY

GlM[Á¬í¤@\¨¿\¢Èw¤v |§305_0801 ïé§Â­Îsåä 1_1­¥êÉæÁÄ¥»³ê½¬´q¿óyÞ»¨Ì X üzûÆ»Ì¥C~ñF«XyNgÉÂ¢ÄC_I¤ÊðSÉðà·éB40 T ÜÅÌpX­¥êºÅ X üzû¥C~ñF«ðªè·éZpÍCÅßC¢EÉæì¯ÄíªÅJ­³ê½àÌÅCYb »¨â Eu »¨ÉÎµÄÀ±ª¨±Èíê½B»¡[¢À±f[^ªñ³
ê½ªC»±ÉÍÈPÉà¾Å«È¢¢­Â©ÌäªÁ½B¢©ÉµÄäðð¢Ä¢Á½©ðÐîµ½¢BéÉÆÇß½B

1. Í¶ßÉ

»ÌãMÒÍCKappler çÌÀ±Êðà¾·é½ß

X üzûªõiX­ray absorption spectroscopy, XASj

ÉCs¨A_[\Í^ÌÉO¥êÉæé[[}É¨¢ÄCwVeB[ª{Æ|Ì X üÉÎ·ézûÌøÊðæèñ¾_ðÂ­Á½B¬´q¿ Ce »·ðÆÁ½àÌð X üzû¥C~ñF«iX­ray absorp­¨ÌîêóÔÍ¥»ðà½È¢ß¡êd©óÔÅtion

XMCDjÆÄÔB

ªC©GlM[ikBTK C½¾µ TK Íß¡·xj¾

XMCD ÍlXÈ­¥«i¨æÑtF¥«j¨¿Ì¥«¯GlM[Ì¢ãNóÔÍ¥CIÈA±GlM[ómagnetic

circulardichroism,éðS¤dqóÔÌ¤Éå«ÈððÊ½µÄ«½1)B­ÔÅ¥«óyÞ»¨Ì L2,3 zû[É¨¯é XMCD Ì¤É¬ºÄ¥»ð­¶³¹é±ÆÅC»Ìæ¤ÉµÄvZ³êÖµÄÍC½Æ¦Î¶£2)ðQÆ³ê½¢Bµ©µÈªçC

½ Ce L2,3 [Ì XAS Æ XMCD Íî{IÉÀ±ÊÉ®Ce, Eu, Yb ÈÇÌ»¨ÌÉÍC±êçÌóyÞ³f·éàÌÅÌ´q¿ª®lðÆçÈ¢àÌªéB¥êÌøÊÍ±Ì©óÔÉ¥CIãNóÔð

Á½BMÒÍ±êçÌ_ð2008, 2009NÉèC»êçÌ½­Íö\µ4,5) C¬´q¿ Ce »¨Ì XAS Æ XMCD Ì¥­¥«âtF¥«ð¦³È¢½ß XMCD ÍÏª³êÈêË¶«ÌSeÍCß¡©GlM[Æ¥CIãNóÔ

¢B¿ª®lðÆçÈ¢nð¬´q¿niÌ[[}GlM[Ì£ÉæÁÄxz³êé±Æð¾

é¢Í C ¿  h ® n j Æ Ä Ô B Å ß C ­ ¥ ê º Å XAS âç©Éµ½BKappler çÌÀ±ÍC»ÌSeð©éÉÍXMCD ðªè·éÀ±ZpªíªðSÉµÄJ­³ÜèÉà¥êªã­Cá¥êÉÀÅÌ¥»Ì§¿ãªèðêCOêÉæÁÄ¥»³ê½¬´q¿óyÞ»¨Ì¨¦½àÌÉß¬È¢B

XAS â XMCD ðªè·é±ÆªÅ«éæ¤ÉÈÁ½B

Kappler çÌÀ±ÌãC7 T ðÍé©Éz¦é­¥êº±êÉæèC¿Ì¥êÏ»â¥»ßöÌÚ×È¤ªÅ

Åd X ü¨æÑî X üÉæé XAS Æ XMCD ðÏª·éuªC¢EÉæì¯ÄíªÅJ­³ê½B±êçÍì«éæ¤ÉÈèCÚ³êÄ¢éBÅÉC¬´q¿óyÞ»¨É¥êð©¯C

K_Vðã\Æ·évWFNg6)ÉæÁÄJ­³ê½

XMCD ÌªèÉ¬÷µ½ÌÍ Kappler ç3) ÅC2004NÌàÌÅCgÑÂ\È¬^pX¥êðúËõ{ÝÌr[éBÞçÍ4.5 K É¨¢Ä 7 T ÌÃ¥êð©¯CCÉ¿Ý XASÉXMCD ðªè·éÆ¢¤æúI±ÆÅ

CePd3 Ì Ce L2,3 zû[Ì XMCD ðÏªµ½B»ÌC

Èû@ÉæÁÄÀ»³ê½BÜ¸C¡©ç 5É6 NOÉC

é Parlebasi¨æ¼cNOðSÆ·éO[vªd X üÌuÌJ­ÑªRåÌ´cO[vjÆ­¥«óyÞ»¨Ì

É¬÷µC40 T ÜÅÌ­¥êºÅ Eu, Yb, Ce ÈÇÌóyXMCD Ì_ð¤¯¤µÄ¢½ÌÅC¢¿­À±Þ»¨ÌóyÞ L2,3 [ XASÉXMCD ªÏª³ê½B±

f[^ðüèµ½ªCíêíêÌ_ðÍ¶ßÆ·éù¶¢ÄC¡©ç 3É4 NOÉºNçðSÆ·éO[Ì_ÅÍ»ÌÀ±Êðà¾·é±ÆªÅ«È©Á½BvªCî X üÌæÅ­¥êºÌ XASÉXMCD ðªè·íêíêÌ_ÉÂ¢ÄÍC2006NÉãLÌ¶£2)ðéuÌJ­É¬÷µ½BÀ±uÌÚ×ÉÖµÄÍ¶MÒÍ Kappler çÌ_¶Ì¤ÒÅ[_¶ÆµÄoÅµCKappler çÌÀ±f[^ð_¶ÌÅãÉÐîµ½ªC»Ì@\Í¢ðÌÛèÅéÆq×£7,8)ðQÆ³ê½¢B¼cçÍCÜ¸CYb »¨ YbInCu4 Ì Yb L3 [¨æúËõ May 2014 Vol.27 No.3  145(C) 2014 The Japanese Society for Synchrotron Radiation ResearchÑ Eu »  ¨ EuNi2 ( Si0.18Ge0.82 )2 Ì Eu L3 [ É ¨ ¯ éXAS ðC4 K ßTÌá·É¨¢Ä40 T ÜÅÌ¥êÅÏª

2. Ce »¨Æ Yb »¨µC±êçÌ¨¿Í¢¸êà30 T ßTÌ¥êÅ Yb ¨æ{ßÅÍCÜ¸s¨A_[\Í^ðà¿¢ÄC¬Ñ Eu Ì¿ªÉßÄ}È¥êË¶«ð¦·±Æð¾ç

´q¿ Ce »¨Ì Ce L2,3 [ XMCD Ì_ÌTªðL©Éµ½9,10)B±Ì}È¿ÌÏ»Í¥êUN¿]Ú

q·é5) BCePd3 ðOªÉu­ªCêÊÌ¬´q¿ CeÆÄÎêÄ¢éB³çÉÞçÍC±êçÌ¨¿Ì XMCD»¨ÉÎ·é¥êøÊÌÁ¥ðð·é±ÆðÚIÆ·ðÏª·é±ÆÉ¬÷µ½11,12)BÜ½C²­Åß¼cçÍ

éB{ßÌSªÍ Yb »¨ÅYbAgCu4 Ì Yb L3 [ XASÉXMCD ÌÏªðà¨±ÈÁ

dqóÔÉÍ¤Ê«idqÉ³EÎÌ«jª

éªCYb Æ Ce ÌèCCe Ì

Ä¢é13) B±êçÌÀ±ÊÍ©ÂÄ©È¢aVÈf[_Ìîbðð·é±ÆÍ»ÌÜÜ Yb ÌîbÌðð^ÅÓ¡·é5)BÁ½ªC¯ÉÈPÈ_Iðßð³È¢ïðÈâèðÜÞàÌÅàs¨A_[\Í^Ìn~gjAÍ®Å^¦

Á½B

MÒÍÜ¸ YbInCu4 Ì Yb L2,3 [ XASÉXMCD Ì_ðÍð¨±ÈÁ½BYb »¨ÌdqóÔÍ Ce »¨ÆÞ«ªéÌÅCCePd3 ÉÎ·éðÍ@ðp·é±ÆªÅ«½14,15)Bµ©µCß¡êdóÔÆ¥CIãNó

çêéB
H(ef|gj mB jzh)f{n fn{
epmpm{pm{edjd{j dj{eL,ka{k,nak,n
n

m

j

k,n

{
{
ff
n n nn
nn

n,m

{
{Vk,n(a f {f a ){U f f f f |Ufcf{n fn pmpm .

ÔÌ[[}GlM[Ìå¬ÖW¾¯ÅÈ­C¥êUN

k,n

{
k,n n

{
n k,n

(1)

¿]Úªê]ÚÆµÄN±é±Æðl¶·éKvªÁ½B»ÌãCÀ±ÅÏª³ê½ Yb L2 [ XMCD Ìðà¾·é±ÆÍÈPÅÍÈ©Á½BÜ½CYbAgCu4

E Ó Ì æ 1, 2, 3, 4  Í » ê¼ ê Ce Ì 4f, 2p, 5d ¨ æ ÑÌ Yb L3 [Ì XMCD ð\ªÉð·é½ßÉÍCdCo

zÊqohÌêdqGlM[ð\íµC4f dqGlÉqJÚÌ¼ÉdCldÉqJÚðl¶·éKvªM[ÉÍOê h Éæé[[}GlM[|gjmB jzhigjÁÍfÌ g öqjªÜÜêÄ¢éB±±ÅCzÊqo½13,16)B
EuNi2 ( Si0.18Ge0.82 )2 Ì Eu L2,3 [ XAS ÉXMCD Ì À±

hÆÄñ¾óÔÍC4f óÔÆÌÔÌ¬¬ÉæÁÄ¬´

ÊÍ Yb »¨æèà³çÉïðÈâèðñNµ½B±q¿óÔðø«N±·ohÅCCePd3 ÅÍ Pd 4d oêÉÂ¢ÄÍCæ 3 ßÅÚµ­q×éªCåÆµÄ 2 Â

hÉ·éiwW k ÍohÌGlM[ÌLªèð\Ìäª

í·jB¬¬ÝìpÍEÓÌæ 5 ÉæÁÄ^¦çêC

Á½B1 ÂÍC¿Ì¥êË¶«Æ¥»ÈüÌÀ±f[^ÔÌï­Èñ®«ÅèCà¤ 1 ÂÍ Eu3{ ¬ªª¦·ÙíÉå«È XMCD ÌMÅ

Á½BMÒÍ

æ 6 ¨æÑ 7 Í 4f dqÔÌN[ÝìpC¨æÑ
XAS ÌIóÔÅ 2p àk³Eª 4f dqÉyÚ·øÍ|e, jéBn( j, jz)Æ m( jz)ÍC»ê¼ê f Æ

YbInCu4 Ì_¤Ìo±ð¶©µÈªçÍõð±¯CVÅæ¤â­êÂÌ_ÉBµ½17,18)Bµ©µC±Ì_Ép ÌêdqóÔÌSp^®Êð jj Éæè\íµ½wWèCj ÌlÍ 4f ÅáÊÌ j5/2 ÉÀè·éB5d d­¢à¾Íð^¦é½ßÉÍCVµ¢À±Éæé_Ì

Å

ØªKvÅ

Cº

qÍÆs ÉæèCj(md, sd)Æ\í·BÈºÅÍCÈçÌO[vªî X üÌæÅ­¥êºÌ XASÉXMCD

PÌ½ß Ce 5d ohÌð³µCÜ½ Uff Í\ªÉåðªè·éuÌJ­É¬÷µ½B»±ÅCî X üÉæé«­Ä 4f2 zuÌøÊª³Å«éàÌÆ·éBÁ½BK¢È±ÆÉC¿å¤Ç»Ì

EuNi2(Si0.18Ge0.82)2 Ì Eu M4,5 [É¨¯é XAS Æ XMCDXAS ÌnóÔinÌîêóÔjÆIóÔÍn~gjÌÀ±ª¨±ÈíêC_ÌØð·é±ÆªÅ«AðÎp»µÄßçêéBá¦ÎCnóÔÍ 1/Nf W½17,18)BÈ¨CEuNi2(Si0.18Ge0.82)2 Ì¥êUN¿]ÚÌ

Ji½¾µCNf Í 4f ÊÌkdxjÌÅáÌß19)Å

@\ÍCCe »¨â Yb »¨ÌêÆÍÙÈèCß¡©óÔª{¿IÈððÊ½·àÌÅÍÈ¢B±êÉÂ¢Äàæ 3 ßÅq×éB

|grc0(g)|0r{ck,j (g)|k, j, jzr
k,jz

z

(2)

{ðàÅÍCÈãÉq×½¤ÉÂ¢ÄCMÒÌ_ðSÉµÄà¾·éBæ 2 ßÅÍCCePd3 Æ YbInCu4 ¨

Æ\í³êéi»ÌGlM[ð Eg Æ·éjB±±ÅCæ Ñ YbAgCu4 Ì ó y Þ L2,3 [ Ì XAS Æ XMCD É Â ¢|0rÍ 4f ÊªóÊÅtF~ÊÈºÌ·×ÄÌóÔÄq×Cæ 3 ßÅÍ EuNi2(Si0.18Ge0.82)2Ì Eu L2,3 [¨æªèL³ê½óÔðwµC±êÍ 4f0 zuÉ·éBÜÑM4,5 [Ì XAS Æ XMCD ÉÂ¢Äq×éBæ 4 ßÍÜ½C|k, j, jz rÍzÊqohÌik, j, jz jÌdqª 4f ÌÆßÉ[ÄéB

i j, jzjóÔÉÚ®µ½óÔÅC4f1 zuð\í·Bæ 1 
Ææ 2 Í¬¬Ýìp Vk,n ÉæÁÄ·éªC±ê
ÈOÌ Vk,n ÉæéÍCöq 1/Nf ÉÂ¢ÄÌøÊÉÈé½ß³·é19) BIóÔÅÍ 2p dqª 5d óÔÉ

146  úËõ May 2014 Vol.27 No.3

ðà ¡ ­¥êºÌ¬´q¿óyÞ»¨É¨¯é X üzû¥C~ñF«ãN³êéÌÅCÂXÌIóÔi|i, j, mrÆ­±ÆÉ·{Ìü`Å\í³êéBéjÍ d{
j pm|0rÆ dj pm|k, j, jzrOêÉæÁÄîêóÔÌ\®Ì jz ÉÎ·ékÞªð¯
Ä 4f óÔª¥C[gðàÂæ¤ÉÈéÆC4fÉ5d
ÔÌð·ÝìpðÊ¶Ä 5d óÔÉ¥C[gªU
N³êC»êª XMCD ðø«N±·B4f dqi j, jz jÆ
5d dqimd, sdjÆÌÔÌð·Ýìpð Eex(md, sd; j, jz)
Æ\í¹ÎC»Ì\®ÍX[^[ÏªCECOi[WÈÇðp¢ÄeÕÉ«º·±ÆªÅ«éi\®ÍÈª·éjBEex(md, sd; j, jz )ÍIóÔÌGlM[ÅLlÌÉ»êé¾¯ÅÍÈ­CdCoÉqJÚ­xÉÎ·é­öqÆµÄdvÈðð¶éB}wVeB[Ì X üÉæénóÔ |grÆeIóÔ |i, j, mrÆÌÔÌdCoÉqJÚsñvfÍC2pÉ5d ÔÌ´qIJÚsñvfÆ´q¿

Fig. 1

Schematic illustration of the ground and low­lying excitedstates and the magnetic­eld dependence of their energies formixed­valence (a) Ce and (b) Eu compounds.

¬Éæéü`Wic0(g) ¨æÑ ck, jz(g) ÆCIóÔÉ¨¢Ä»êçÉ·éàÌjðp¢Ä@BIÉvZÅ«éªC4f1 Ìzu¬ªÉÎµÄÍ 4f dqÆ 5d dqÌð·gjmB jh ª kBTK ðz¦êÎCîêóÔÌ«iÍß¡©óÝìpÌ½ß 5d dqg®ÖÌ®aªªûkµCJ

Ô©ç[[}ÅáóÔÉÚsµC­¥êÉÀÅÍÌÚsñvfª­³êé±Æðl¶·é±ÆªKvÅ éB

Ce3{ óÔÆÈèC¥»Í Ce

4f óÔªi j, jzjÉéÆ«C2p óÔ©ç 5d Ìimd, sdj½è gj j15/7 {[A¥qÉOa·éBÂÜèC¥êÉæéîêóÔÌÏ»ÍCß¡óÔÖÌJÚsñvfÌ­ªª Eex (md, sd; j, jz )Éäá

©óÔ©çÅá[[}óÔÖÌNXI[o[ÉæÁ·é±ÆÍæ­mçêÄ¢é1,2)B}wVeB[Ì X üÄð³êéB

ÉæédCoÉqJÚZqi­øÊðÜÞàÌjð
M} Æ¯ÎC»êçÉÎ·é XAS XyNgÍÈãÉTàµ½_ÌggÝÉæÁÄCNXI[o[ÌOÆãÌCÓÌ¥êÉÎµÄCXAS Æ XMCD ÌXy
NgÌvZªÂ\ÉÈÁ½BêûCKappler çÌÀ±G/pF}(v)|i, j, m|M}|gr|2(v|Ei, j, m{Eg)2{G2i, j, m(3)ÍC¬´q¿ Ce »¨É¥êð©¯Ä XMCD ðÏªµ½ÅÌÀ±ÆµÄÓ`ªéªC[[}GlM[ªß¡©GlM[Éä×ÄÜèÉà¬³­CNX

I[o[ÌSeð©é±ÆÍÆÄàÅ«È¢BCePd3 ÌÆÈèCÊíÌ XAS XyNgÍiF{{F|)/2 ÉæèCß¡·xð500 K öxÆ©ÏàêÎCNXI[o[ÍÜ½ XMCD XyNgÍiF{|F|jÉæè^¦çêéB±±ÅCv Í X üÌGlM[C G Íàk³EÌõ½È

500 T ©ç1000 T Ì¥êÉæÁÄÍ¶ßÄÏª·é±ÆÇÉæéXyNgÌLªèð\í·BªÅ«éB7 T Ì¥êÅÍCá¥êÉÀÉ¨¯é¥»Ì§¿ãªèðæ¤â­Ïªµ½Éß¬È¢B»ÝÌÆ±ëC

³ Ä C XAS Æ XMCD Ì ¥ ê Ë ¶ « ð x z · é @ \XMCD ÌÏªªÂ\ÈÅ¥êÌ40 T ðàÁÄµÄàCÍC¥êÉæÁÄß¡©óÔ©çÅá[[}óÔÖÌ

500 T ÈãÅN±éNXI[o[ÉÍÆÄàèªÍ©ÈîêóÔÌNXI[o[Å¢Bµ©µCÈºÅq×é YbInCu4 ÅÍC[¥êÅÌ

é±Æð¦»¤B(2)®Å\í³êéîêóÔ |grÍC[¥êÅÍß¡êd©kBTK ª CePd3 ÌêÆ¯öxÅéÉà©©íç¸C¥èC¥»ðà½È¢BFig. 1(a)ÍC[¥êÉ¨êUN¿]Úªê]ÚÅ

é½ßÉC40 T tßÌóÔÅ¢Ä¬¬ÝìpÉæèß¡©óÔª`¬³êélq¥êÅÍ gjmB jhâkBTK i½¾µCYb ÅÍ j7/2, gjÆC¥êÌóÁÉæèîêóÔÆãNóÔÌGlM[ª8/7jª¬è§¿CùÉNXI[o[ðz¦Ä¢é±Ï»·élqðCÍ®IÉ¦µ½àÌÅÆðmF·é±ÆªÅ«éBéB[¥êÅ

ÍCß¡©óÔæèà©GlM[ kBTK ¾¯¢GlM[ÌãNóÔªèC»êÍ¥C[gðàÁ

CePd3 ÉÂ¢ÄÌLqðI¦éÉ½ÁÄCKappler çÌÀ±ÊÆMÒÌ XASÉXMCD Ì 7 T É¨¯évZ

½ 4f1 zuÌóÔizÊqoh©çdqª 1 Â 4f ÊÊiÌÖWÅXyNgÌ}ÍÈª·éjÌÖWÉÂ

ÉÚ®µ½óÔÅCzÊqohÌ³EÌ½ßA±Gl

¢ÄÈPÉq×éBvZÊÍÈºÌ_É¨¢ÄÀ±ÊM[ðàÂjÅ

Æè«IÉiéB¥êðóÁ·éÆCÅáãNóÔÌ

GlM[ª[[}GlM[ gjmB jh ¾¯áº·éÆ

P XAS Éé¢Í¼èÊIÉjêv·éBòÍCs[NÆTeCgªÏª³êÄ¢éªC¯ÉCîêóÔi|grjÌÌ(2)®æ 2 Ì 4f1 zu¬

XMCD Í±ÌCs[NÌÊuÉÌÝ»êCTeCª ª ¥ » ð à ¿ C G l  M [ Eg ª  X É á º · é B

Q L3 Æ L2 ÌÎ­xÍCXAS
gÌÊuÉÍ»êÈ¢BòúËõ May 2014 Vol.27 No.3  147

ÅÍ L3 Ìûªå«¢ÌÉÎµÄCXMCD ÅÍ L2 Ìûª
R XMCD Æ XAS Ì ­ x ä Í L2 [ Å 10|3 Ì
å«¢Bò

I[_[Å

éBÚ×ÍC¶£5)ðQÆ³ê½¢B

4f1 Ì³EzuÆÈéÌÅC¬´q¿ Ce »¨ÆÌÔ
ÉdqÉ³EÎÌ«ª¬è§ÂBÂÜèC(1), (2), (3)®
Ì_®Í³E`Ì Yb »¨ÉÎµÄàCwÇ»ÌÜ

YbInCu4 É b ð Ú · B¼ c ç Í C Ü¸ YbInCu4 Ì YbÜÌ`Å¬è§ÂB½¾µC4f óÔÌ j Í Ce ÅÍ5/2Å

L3 XAS Ì¥êË¶«ð40 T ÜÅÌ¥êÅªèµC»ÌÁ½ªCYb ÅÍ7/2ðà¿¢È¯êÎÈçÈ¢iÎÌðÍ©ç¿Ì¥êË¶«ðß½9)BÊÍ Fig. 2(a)É«Ì¬³ÈjêjBÜ½CXAS ÌIóÔÅÍCàÁÆå«¡Å¦³êÄ¢éB[¥êÅÌ¿Í2.83Å

éªC30

ÈÎÌ«ÌjêÆµÄCàk³EÌ|eV Ufc ª

T ßTÅ}ÉÁµC40 T ÅÍ2.96ÉB·éB·xÍCe Ì 4f dqÉÍøÍÆµÄÍ½ç­ÌÉÎµÄCYb Ì

5 K ÅC¿Í²Å

4f ³EÉÍËÍÆµÄÍ½ç­±Æðl¶µÈ¯êÎÈéB¯¶²¿Ì¥»à30 TßTÅ}ÉÁµC40 T ÅÍOaÌXüð¦·iFig. 2çÈ¢B(b)Ì¡ðQÆjBÀÍCP»¿ÉÎ·é¥»Èüªù³ÄCXAS Æ XMCD ÌXyNgðvZ·éÉ

ÉªçêÄ¢ÄCFig. 2(c)ÉÆÅ¦·æ¤Éñ32 T ÅÁÄCs¨A_[\Í^Ìp[^[CÁÉ¬¬½èCqXeVXª©çêé20) B²­xÆ 4f ÊÌlðßÈ¯êÎÈçÈ¢BÅà©RÈ¿ÅÏª³ê½¿Ì}ÈÏ»ÍC{ÍêÌ¥êU

û@ÍC¿Æ¥»Ì¥êË¶«ÌÀ±ÊðÄ»·éæN¿]ÚªC²¿ÉÁLÌsÏê«iåÆµÄ¥»¤É»êçðßé±ÆÅ

eÕ²ÌsÏêªzjÌ½ßÉÈç³êÄA±Ï»ÉÈÁîêóÔ |grªÜèC|grÉÎ·é¿Æ¥»ÌúÒlê]Úª½àÌÆðß³êéBéBp[^[ð^¦êÎªeÕÉvZÅ«éÌÅC»êçªÀ±ÊðÄ»·éæ¼cçÍCÉ XMCD Ì¥êË¶«ðªèµ½11) B¤Ép[^ðß¼·ÌÅéB±ÌÛÉå«Èâè

XAS Æ XMCD ÌÀ±Êð Fig. 3(a)Æ 3(b)É¦·BMÍCêÌ¥êUN¿]ÚðÇ¤µ¤©ÅÒÍs¨A_[\Í^ðà¿¢ÄC±êçÌXyN¨A_[\Í^ÍPêÌóyÞTCg¾¯ðµÁÄ¢éBsgð_ðÍµ½15) B ¬´q¿ Yb »¨ÌîêóéÌÅC]Úðµ¤±ÆÍÅ«È¢BóyÞTCgÉ¨ÔÍ 4f14 Æ 4f13 Ìdqzuª¬¬µ½àÌÅ¯éß¡©óÔ©çÅá[[}óÔÖÌNXI[

éªCdq`ÌÖíèÉ³E`ðp¢êÎC±êçÍ 4f0 Æo[ªLqÅ«é¾¯ÅéBêÌ¥êUN¿]Ú

Ì÷I@\ð³Ê©çµ¤ÉÍüúIA_[\Í^ªKvÅë¤Bµ©µCêUê]ÚªN±é±ÆðOñÆ·êÎCeÅóyÞTCgÉËe³ê½ÇIÈFig. 2

Experimental results (squares) of the eld dependence of(a) valence and (b) magnetization for a powder sample of
YbInCu4, compared with the theoretical results (solid
curves). In (c), the experimental magnetization curves for asingle crystal are shown with open and solid circles, and thetheoretical results of the valence and magnetization for the
single crystal are shown with dotted lines in (a) and (c).

148  úËõ May 2014 Vol.27 No.3

Fig. 3

Experimental results of (a) XAS and (b) XMCD spectra of
YbInCu4 for various magnetic elds.

ðà ¡ ­¥êºÌ¬´q¿óyÞ»¨É¨¯é X üzû¥C~ñF«dqóÔðLq·é±ÆÍs¨A_[\Í^ªÅà¢ Ä C » ê ¼ ê Ì  É Î · é ¶ Ý m ¦ ð WL ( h ) , WH

¾ÓÆ·éÆ±ëÅéBá¥êÆ¥êÅÍp(h)CÆÄñÅ¢éB½¾µCWH(h)1|WL(h)ÅCWH

[^[i¬¬­xÆ 4f ÊÌgjÍÊXÌlðÆéÍ(h)Í h32 T ðSÉµÄKÈGlM[ðàÂéBXAS â XMCD ÍêÂÌóyÞTCgãÌÇ¸Åâë·ÖÅéBV Æ ef ð±Ìd¦Å½Ïµ½àÌÍCIÈdqóÔÉæÁÄwÇ·×Äªè³êéÌÅC±Fig. 4(a)C4(b)É¨¢ÄÀüÅ¦³êÄ¢éBÜ½C¥

Ìû@ÍÉßÄLøÅ

»C¿CXASÉXMCD XyNgÈÇéBÀÛÉCMÒÍ20NÈãàçäé¨ÊOÉCCe à®Ì a_g ]Úi·xâ³ÍÉæÁÄUN³ÍCÜ¸á¥êÆ¥êÅÊXÉvZµCµ©éãCêéêÌ¿]ÚjÉÆàÈ¤ XAS XyNg`ó

WL(h)Æ WH(h)ðd¦ÆµÄ½ÏlðÆé±ÆÉ·éBÌÏ»ð± Ìû@Åð ÍµC»Ì Lø«ðm FµÄ¢»Ìæ¤ÉµÄvZ³ê½¿Æ¥»ª Fig. 2(a)Æ 2(b)é21)BÉÀüÅ¦³êÄ¢éªCÀ±Êðæ­Ä»µÄ¢éÜ¸CP»¿ÌêÌ¥êUN¿]ÚÉ

ÚµCá¥êÆ¥êÌ¬¬­x V Æ 4f Ê ef itF

iÀÍCÀ±Êðæ­Ä»·éæ¤ÉCeÌ V Æ ef ¨æÑd¦ªIÎêÄ¢é)15)B~ÊðîÉµÄ¢éjÌlð Fig. 4(a)Æ 4(b)Ì_á¥êÌ V Æ ef ÉÎµÄvZ³êéß¡·xÍ TKüÌæ¤Éß½Æµæ¤22) B»¤·êÎCCÓÌ¥ê

485 K ÅC40 T ÈºÌ¥êÉÎµÄÍ gjmB jhkBTK Æ­xÉÎµÄnÌîêóÔªvZ³êC¿Æ¥»Ì¥êÈèNXI[o[ÉÍÍ©È¢ióµÍ CePd3 ÉÄË¶«ª Fig. 2(a)Æ 2(c)Ì_üÌæ¤ÉßçêéB¥¢éjBµ©µC¥êÌ V Æ ef ÉÎµÄvZ³êéß

»ÈüÍP»ÌÀ±Êðæ­Ä»µÄ¢éBÉC²¡·xÍ TK 1.4 K ÆÈèC32 Ti]Ú¥êjÈãÌ¥¿ÉÎµÄÍC]Ú¥êðSÆµÄá¥êÆ¥êÅeÕÉ gjmB jhâkBTK ª¬è§¿CNXI[o[ðêª¤¶µC»Ì¶Ým¦ª Fig. 4(c)Ìæ¤ÉÏ»·éz¦éBYbInCu4 ÅÍCàµê]ÚªÈ¯êÎCNàÌÆ¼è·éBÈ¨C±±ÅÍ¥êÌÁßöðµÁÄ

XI[o[ðz¦é½ßÉ300 T Æ©500 T Ì¥êðK
vÆ·éÌÅ

éªCê]ÚÌ½ßÉ40 T Ì¥êÅùÉNXI[o[ðz¦C¥»ÍOa¥»Ì4mB/Yb ÉßÃ¢Ä¢é±Æªí©éB±Ìæ¤ÉµÄvZ³ê½ XAS Æ XMCD ÌXyNg
ð Fig. 5(a)Æ 5(b)É¦·15) BXAS ÌCs[NÍFig. 4Magnetic­eld dependence of (a) hybridization and (b) 4f
level for a single crystal (dotted line) and a powder sample(solid curve) of YbInCu4. In (c), the weights of the low­ andhigh­eld phases are shown for the powder sample.

Fig. 5

Calculated results of (a) XAS and (b) XMCD spectra of
YbInCu4 for various magnetic elds. The XMCD spectra at
the L2 edge are shown with an extended scale in the inset.

úËõ May 2014 Vol.27 No.3  149

4f1 ³Ezui4f13 dqzujÉæéàÌÅC»ÌáGlç­CÀ±ðà¾·éÅàÂ\«Ì¢@\ÍC4f ÆÌM[¤É 4f0 ³Ezui4f14 dqzujÉæéTeC

ð·ÝìpÈOÌ@\Éæé 5d dqÌ¥CªÉÉ

gª©çêéBCe »¨ÅÍCÊCTeCgªCÆvíêéB±±ÅÓ·×«±ÆÍC L2,3 [Ì XMCDés[NÌGlM[¤É©çêéªCYb ÅáGlÍ 2pÉ5d ÔÌdCoÉqJÚÉæÁÄ¶¶éàÌÅ

M[¤É»êéÌÍCCe Ì 4f dqÉÎ·éàk³E|e©çC¼ÚÉÏª³êÄ¢é¥CªÉÍ Yb 4f óÔÌàVªøÍÅ
ÍËÍ¾©çÅ

éÌÉÎµÄCYb Ì 4f ³EÉÎµÄBéiUfc ÌlÍ7.0 eV ÉÆçêÄ¢éjCs[Nª 2 ÂÉªôµÄ¢éÌÍC5d ohÌóÔ§xª 2 ÂÌs[NðàÂ½ßÅ

éB±ÌvZÅàC

Ce »¨ÉÎµÄ¨±ÈÁ½ÌÆ¯¶æ¤ÉCÅÍ 5dÌÅÍÈ­CYb 5d óÔÌàÌ¾Æ¢¤±ÆÅ

é

éBà¿

ëñCÊíÍ 4fÉ5d ÔÌð·Ýìpª 5d dqÌ¥CªÉÌåvÈ´öÈÌÅéªCYb Ì L2 XMCD Ìæ¤

É»Ìñ^ª¬³¢êÉÍCÊÌ@\ªåvÈ´öÉÈé±Æªè¤éB¨»ç­CIn â Cu Ì`±dqª¥êóÔðêÂÌ´qÊÆµÄµÁÄ¢éªCÅIIÈiK

ÉæÁÄ¥»ðà¿C»Ì`±dqª Yb Ì 5d dqÆ¬Å±ÌÊð 2 ÂÌs[NðàÂ 5d ohÌóÔ§xÅ¬·é±ÆÉæÁÄ 5d dqª¥»³êCXMCD ª¶¶ë¤B±Ì@\ª Yb Ì L2 XMCD ÉÌñ^ôÝñÅ¢éB¥êÌÁÆÆàÉTeCgÌ­xª½àÌÅ

¸­µCCs[NÌ­xªÁ·éªC±êÍ¥êU

ð· é±ÆÍ MÒÌf vZÅùÉ m©ßçê Ä¢N¿]ÚÉæè Yb Ì¿ªÁµÄ 3 ¿ÉßÃ­±Æé15) BÜ½C±êÆÞÌ@\ª­¥« CeFe2 Ì Ce L2,3ðÓ¡µÄ¢éB±êçÌvZÊÍCFig. 3(a)Ì XAS

XMCD ÌåvÈ@\ÅÌÀ±ÊÆæ­êvµÄ¢éBÈí¿CCeFe2 ÅÍ Fe Ì 3d ohª­¥«XsªÉ

XMCD Í XAS ÌCs[NÉÎµÄÌÝ¶ÝµC

é±ÆÍùÉmçêÄ¢éB·ðà¿CCe 5d ohª±êÆ¬¬µÄ¥CªÉ·é±Æ

T e  C g É Î µ Ä Í ¶ Ý µ È ¢ B L3 ¬ ª É Î · éÉæè Ce L2,3 XMCD ªà¾³êÄ¢éi±Ìêà Ce

XMCD Í¥êÉÎµÄP²ÈÁð¦µC¥êUN¿

L2 XMCD ÌÍÅé)2)B]ÚÌÆ±ëÅÍ}ÉÁ·éªC40 T ßTÅÍOa

± ê É Ö A µ Ä C à µ î X ü É æ é Yb M4,5 [ ÌXüð¦·B±êçÌÊÍ Fig. 3(b)ÌÀ±ÊÆæ­®

XMCD ªÏªÅ«êÎCYb 4f dqÌ¥CªÉª¼Ú·éBêûCYbInCu4 Ì Yb L2 [Ì XMCD ÌvZÊm³êéÌÅCåÏLÓ`ÅÍCYb ÉÁLÌÙíÈU¢ð¦·BCe »¨ÅÍ L2

YbInCu4 Ì Yb M4,5 [ XMCD XyNgÌ_\ªÍMÌ XMCD ÌUÍ L3 æèàå«¢ªCYb »¨ÅÍÒÉæÁÄ^¦çêÄ¢é24)Bë¤B­¥êºÉ¨¯é±ÌßðI¦éOÉCYbAgCu4 Ì Yb L3 XMCD13)ÉÂ

L2 Ì XMCD ÌUÍ L3 æèàÍé©É¬³¢B³çÉC
L2 Ì XMCD ÌUÍ¥êÉÎµÄP²ÉÁ¹¸C¥ê¢ÄÈPÉq×éBYbAgCu4 ÍâÍè30 T ßTÅ¥êUUN¿]ÚÌßTÅOaµC»êÈãÌ¥êÅÍtÉ¸N¿]Úð¦·ªC¿Ì¥êË¶«Í YbInCu4 Ìæ­·éiFig. 5(b)Ì}ü}ðQÆjB±êÍC¥êUN¿¤É}ÅÍÈ­C¥êÆÆàÉÉâ©ÉÏ»·éB±ê

]Úæè¢¥êÅÍ 4f dqÌîêóÔª[[}ÅÍ YbAgCu4 Ìá·É[¥êÉ¨¯é TK ª120 K öxáóÔÌ jz7/2ÉßÃ¢Ä¢­½ßÅC4f dqªÌÅCYbInCu4 Ìêæèà©Èèá¢½ßÅ

jz 7/2óÔðÆêÎC4fÉ5d Ôð·ÝìpÆ 2pÉ5d

Í¼cçÆ¤¯ÅC35 T ÜÅÌ¥êÉÎ·é YbAgCu4éBMÒÔdCoÉqJÚÌIð¥©ç L2 [Ì XMCD ª 0 ÉÈÌ Yb L3 XASÉXMCD ÌÀ±f[^ð_ðÍµ½ªC

éB±Ì »ÛÍ CYb Ì L3 XMCD Åà CÜ½»êçÍÉßÄ¬³Èê]Úi]Ú¥êÉ¨¯é V Æ

Ce Ì L2 Æ L3 Ì XMCD Åà©çêÈ¢ Yb L2 XMCD É

ef ÌsA±ªªÉßÄ¬³¢jð¼è·é±ÆÉæèæ­ÁLÌ»ÛÅCÊ½µÄ»êªÀ±ÅÏª³êé©Ç¤©

Ä»³ê½13) BÀÛÉ¬³Èê]ÚªN±ÁÄ¢éÌ

éÌÅ

©C

»¡[¢B
cOÈªçCFig. 3(b)É¦³ê½ L2 XMCD ÌÀ±Êé¢ÍPÈéNXI[o[ÅéÌ©ÍC¡ãÌæè¸§ÈÀ±ÉæÁÄßé±ÆªKvÅ ë¤BÁÉC

Í±Ì_\ªÆÍÙÈÁÄ¢éBÀ±ÊÍ XMCD Ì

YbAgCu4 Ì Yb L3 XMCD É¨¢Ä»¡UÌ¥êË¶«ª_ÉíÈ¢¾¯ÅÈ­CXMCDCoÉqJÚÉæé XMCD ÌáGlM[¤ÉdCldÌª³ÅÈ­ÉÈÁÄ¢éBÀ±Æ_ÌsêvÌ

ÉqJÚÉæéÌ XMCD XyNgªÏª³ê½±Æ

´öð¾ç©É·é½ßC±êÜÅÌ_ÅÍl¶³êÄÅé±ÆÍCdé13) BdCldÉqJÚÍdCoÉqJÚÉä×Ä

¢È¢ 4f dqÌ»êÌøÊªÜ¸Ø³ê½15,23) BåJÚ­xªy©É¬³¢ÌÅCXAS ÅÍdCoÉqJÚé  Ê Æ µ Ä C YbInCu4 Ì  » ê Í Yb L2

ÌÉBêÄ¯Ê·é±ÆªÅ«È¢ªCXMCD ÍdCÏ»¡

XMCD ÌðÉ·éÂ\«ªé±Æªí©Á½B

ldÉqJÚÉÎ·é´xª¢ÌÅ¯ÊªÂ\ÉÈÁ½±êÍCêÊI©n©ç¾¦ÎCóyÞÌ XMCD Æ»àÌÅêÌÖWÆ¢¤¢JñÌ¤ÛèðñN·éàÌÅ éªCêÆÆàÉÁ·éªC35 T ßTÅÍÁ¦ªOaXüéBdCldÉqJÚÉæé XMCD Ì­xÍ¥

YbInCu4 ÌÌ L2 XMCD ÌUðà¾·é½ßÉÍCð¦·B_vZÍ»Ì XMCD ÌXyNgÆ¥êË¶»ÀÌ»êÌå«³Ís\ªÅ«ðæ­Ä»µ½¾¯ÅÈ­CXMCD Ì­xª50 TéÆ_³ê½B¨»

150  úËõ May 2014 Vol.27 No.3½

ðà ¡ ­¥êºÌ¬´q¿óyÞ»¨É¨¯é X üzû¥C~ñF«èÅÅåÆÈèC»êÈãÌ¥êÅÍtÉ¸­·é±Æð\¾µ½BÜ½C_vZÉæÁÄ YbAgCu4 Æ YbInCu4ÌdCldÉqJÚÉæé XMCD ðärµ½Æ±ëC
YbInCu4 ÅÍ YbAgCu4 æèàá¥êÅ¿¬ªå«¢±ÆC¥êUN¿]Úª}Åé±ÆCÌ 2 ÂÌR©çdCldÉqJÚÉæé XMCD Ì­xª©Èè¬³­ÈèC±êÜÅÌÀ±ÅÍmCYx©çª£³êÄ¢È¢±Æª»¾µ½16) BÈ¨C¼cçÌÀ±ÅÍC
YbAgCu4 Ì Yb L2 XMCD Í­xª¬³­C¸§ÈªèªÅ«È©Á½½ßÉ_¶ÉÍñ³êÄ¢È¢B
YbInCu4 Ì L2 XMCD Ì@\ÆÌÖW©çC¡ãC¸§
ÈÀ±ª¨±Èíêé±ÆðúÒµ½¢B

3. EuNi2(Si0.18Ge0.82)2
EuNi2 (Si1|xGex )2 Ìg¬Ì¨¿nÍC³Ü´ÜÈ x ÉÎµÄCÁÙÈ·xÉ¥êË¶«ð¦·±Æ©çC»¡ªà½êÄ¢½B1997NÉacç25)Í x0.82ÌnÉÎµÄ
Eu L3 [Ì XAS Ì·xË¶«i[¥êºjðªèµC
Eu Ì¿ n Ì·xË¶«ªCFig. 6(a)ÉÅ¦·æ¤ÉC
60`70 K ßTÅµ¢Ï»ð¦·±Æð©oµ½Bá·
i4.2 KjÉ¨¯é¥»Èüàacç25)ÉæÁÄªè³êC»ÌÊÍ Fig. 6(b)É_üÅ¦³êÄ¢éæ¤ÉC30 T½èÅ}È¥»ÌåªÏª³êÄ¢éB±Ì¥»ÌÏ»Íê]ÚÉÁLÌqXeVXðº¢. acçÍ±Ì]Úð¥êUN¿]ÚÅ

éÆðßµ½BÈ¨C{Í¥»ÌsA±Ï»ðº¤¤Ìê]ÚªA±Ï»Æ µ Ä Ï ª ³ ê Ä ¢ é  R Í C YbInCu4 Ì ê  Æ ¯ l
ÉCá¥êÆ¥êÌ¶Ým¦Ì¤¶ÉæéàÌÆð
ß³êéB30 T ßTÅÌ]Úª¥êUN¿]ÚÅ

Fig. 6

Experimental results of (a) temperature dependence of theEu valence (open circles), (b) eld dependence of magneti­zation (dots), and (c) eld dependence of the Eu valence(open circles) for EuNi2(Si0.18Ge0.82)2. A theoretical result
by Kotani and Nakamura18) is shown with a solid curve in(a), and those by Matsuda et al.10) are shown with solid
curves in (b) and (c).

é±ÆÌmFÍC2008NÉ¼cç10) ª40 T ÜÅÌ¥êi·xÍ4.3 KjÌàÆÅ Eu L3 XAS ðªè·é±ÆÉæ\ð Fig. 1(b)ÉÍ®IÉ¦·B[¥êÅ©Â¬¬ V ð

ÁÄÈ³ê½Bªè³ê½¿Ì¥êË¶«ð Fig. 6(c)É³·éêCEu 4f ÌîêóÔÍñ¥«Ì 4f6iEu3{CJÅ¦·B[¥êÅÌ¿Íñ2.8ÅC30`40 T É¨¢0jóÔiÈº|0rÆL·jÅCÅáãNóÔÍ`±dÄ¿Í}Èáºð¦·±Æªí©éBq ð 1 Â 4f ó ÔÉÚ ®³¹ é± ÆÉæ èì çêé 4f7 c±Ì¥êUN¿]ÚÌ{¿IÈ@\ÍùÉacçÌ_(Eu2{CJ7/2jóÔiÈº|7/2, Jz, crÆL·jÅéB25) ÅwE³êÄ¢½B[¥êÌ¿Í 3 ¿É©Èè

½¾µCc Í`±ÑÌ³Eð\íµCÈPÌ½ß`±ÑÌß¢ªC3 ¿Ì Eu Í 4f6 Ìdqzuð¿Ctg¥ÉÍ³·éB±ÌêÌd×Ú®Év·éGlM[ð¶æè ÅáG l M[ó ÔÍ CL3C S 3 Å J0 Å

d×Ú®GlM[ D ÆÄÔB±±ÅCóÔ |0rÆ|7/2,

é26) BÂÜè Eu3{ ÌÅáóÔÍ J0 Ìñ¥«óÔÅJz, crÌÔÉ¬¬sñvf V ð±üµC³çÉ¥ê h ð©

éBêûCEu2{ Í 4f7 zuðà¿CL0CS7/2ÅCJ

¯ÄãÒÌGlM[É[[}|g7/2mBJzhi½¾µC

7/2Ìå«È[gðàÂ¥«óÔÅg7/22.0jðl¶·éB±Ìs¨A_[\Í^ðð

é½ßC¥

êðóÁ·éÆ[[}GlM[Ì¾Éì®³êÄ¿¯ÎC¥êÉË¶·éîêóÔªÌÏ»ª¶¶éB½¾µCacçÌðßÍ¬´q¿øÊð³µ­ÌèüêÄ¢È©Á½½ßCs\ªÅÁ½B

Eu3{ Æ Eu2{ ÌÔÌ¬´q¿øÊðl¶µÄC¿Æ

|grC(g, 0)|0r{C(g, Jz)|7/2, Jz, crJz(4)¥»Ì¥êË¶«ðßÄvZµCÀ±Æärµ½ÌÍ¼cç10)Å

éBEu »¨ÌâÎ[xÉ¨¯é¥êUN¿Ï»Ì@Ì`ÉßçêC»Ì«iÍ[¥êÅÍ Eu3{ Éß¢¬´q¿óÔÅ

éªC­¥êÉæè[[}GlM[

úËõ May 2014 Vol.27 No.3  151

(7/2)g7/2 mBh ª D æèå«­ÈéÆNXI[o[ðNéBãLÌÀ±Æ_ðÍÉ¨¢ÄñN³ê½âèðð

±µÄ Eu2{ ÌÅá[[}óÔÉßÃ­iFig. 1(b)ÌÅ

·é½ßÌêÂÌ®ÍCEu3{ Ì 4f dqÌ¥»ðÇ¤láGlM[Ê Eg ðQÆjBÈ¨C|0râ V ÈÇÌL¦é©Æ¢¤±ÆÅÁ½Bàµ½ç©ÌRÅC@ÍOßÌ»êçÆd¡·éªCè`ªÙÈé±ÆÉÓ

ÉbNí¥«ªåÉ­³êé±Æª³ê½¢i(2)®Æ(4)®ÍC»ê¼êÌ´_¶Å

6(b)Ì¥»ÌvZÊÉÍ Eu3{ Ìñ^ªÁ¦çêCÀ±£5)Æ¶£18)Ì\Lð»ÌÜÜ¥Pµ½àÌÅ

é¶

éjB

Fig. 1(b)Æ 1(a)ðär·éÆCEu »¨Æ Ce »¨i¨æÑ Yb »¨jÌ¥êUN¿Ï»iÆè¦¸CêÎCFig.

ÆÌ·ÍðÁÅ«éBÜ½CXMCD É¨¯é Eu3{ Ìå«ÈMàðÅ«C·×ÄÌâèªð·é±ÆÉÈéBÀÛÉC@ÉbNí¥«ª¬´q¿øÊÉê]ÚÌøÊð³·éjÌ@\ÍÞµÄ¢éªC

æè­³êÄâè_ªðÁ³êéÆ¢¤_¶àoÅ³êª{IÈá_ª½27)Bé±ÆÉCÃ­BCe »¨ÅÍ¬¬øÊÉæÁÄß¡©óÔªìçêé±Æª{¿IÉdv

MÒÍCæÉq×½ YbInCu4 Ì_ðÍðI¦½ãC

ÅCñ¥«Ìß¡êdóÔÆ¥CIãNóÔÌÔÌN

EuNi2(Si1_xGex)2 ÌäÉ§íµ½B³Ü´ÜÈpx©ç±

XI[o[ÉæÁÄ¿Ï»Íà¾³êéBêûCEu »Ìâèð¢µC@ÉbNí¥«ª¬´q¿ø¨ÅÍß¡©óÔÍ¶ÝµÈ¢Bñ¥«Ìß¡êdÊÉæÁÄÙíÉå«È­ðó¯é±ÆÍÈ¢Æ»fµóÔÅÍÈ­ÄC[¥êÉ¨¯éÅáóÔÍ¬¬ª±ü½BÜ½CYbInCu4 Ì_ðÍÌo±ª±±ÅàðÉ§³êéÈO©çùÉñ¥«Ì Eu3{iJ0jÌêdóÔ

Á½B»ÌÊC¼cç10) Ì¿ÌÀ±Ê¨æÑ¿ÅéB»µÄC±ÌóÔÆ Eu2{ Ì¥CIãNóÔÌÔÌNXI[o[ª¿Ï»Ì{¿IÈ´öÅéB¼ÒÌá¢ÍC(2)®Æ(4)®Ìá¢©çà¾ç©Å

éB(2)®É¨¢Ä¬¬ V ð 0 É·éÆCß¡©GlM[ªÆ¥»ÌvZÊÉÍCÇ¿çà^â_ª©ÑãªÁÄ«½BÜ¸CFig. 6(c)ÌÀ±ÊÍ Fig. 6(b)ÌÀ±ÊÆeêÈ¢±Æð¦·B»Ì½ßÉC40 T É¨¯é¿Æ¥»ÌÀ±lÉÚµæ¤iFig. 6 Ì40 T É¨¯écÌ

0 ÉÈèC¥CIÈ|k, j, jzrÌÅáÊªîêóÔÉC»_üðQÆjBFig. 6(c)ÉæêÎC40 T É¨¯é¿ÍñµÄóÔ |0rÍãNóÔÆÈéBêûC(4)®Å V0Æ

2.5Å

éBµ½ªÁÄCEu3{ Æ Eu2{ Ìä¦Í50÷Æ·êÎCñ¥«óÔ |0rªîêóÔÆÈèC¥CIóÔ50÷Å

éBEu3{ Ì¥»Í³Å«éÙÇ¬³¢µC|7/2, Jz, crÍãNóÔÆÈéB

Eu2{ Ì¥»ÍÅåÅà 7 mB Åé©çC40 T ÅÌ¥»

¼cç10)ÍîêóÔ |grðvZµC»Ì¿ n3|C(g,Í3.5 mB ðz¦È¢±ÆÍeÕÉð³êéBµ©éÉC0)|2 {2|C(g, Jz )|2 Æ¥» Mg7/2 Jz |C(g, Jz )|2 Ì¥

Fig. 6(b)ÉæêÎ40 T É¨¯é¥»ÌÀ±lÍñ 6 mB ÉêË¶«ðß½B»ÌÛÉCs¨A_[\Í^É{¿IÈµª¶Ý·é±Æªí©éB

Jz

JzÜÜêép[^[ D Æ V ÌlÍ¿Ì¥êË¶«Ì
À±Êðæ­Ä»·éæ¤ÉIñ¾B¥»Æ¿ÌvZàBµÄ¢éBµ½ªÁÄC¿Æ¥»ÌÀ±lÌÔÉÍ
¿Æ¥»Ì_ðÍÉÖµÄÍC¼cçª¥êUN¿]Úðê]ÚÆµÄµÁÄ¢È¢±ÆªâèÅéBÊÍC»ê¼ê Fig. 6(b)Æ 6(c)ÉÀüÅ¦³êÄ¢30 T ÈãÉ¨¯é¥»Ì}ÈÁð³µ­Lq·é½

éBåÏï­È±ÆÉCD Æ V ª¿ðÄ»·éæ¤ÉßÉCê]ÚÌe¿ðl¶µÈ¯êÎÈçÈ¢±ÆÍCIÎê½Æ«C¥»ÌvZlÍÀ±Éä×ÄYbInCu4 Ìá©çàwÇ©¾Å

³·¬é±Æª»¾µC»Ì´öª½ÅÜèÉà¬éÌ©[Èâ

éB±Ìe¿ÍC¿Ì¥êË¶«Éàå«ÈÏ»ðà½ç·Åë¤B³çÉèªc³êé±ÆÉÈÁ½B¼cç12) ÍC2009NÉ±

À±Ì¥»ÈüðèÊIÉÄ»·é½ßÉÍC¥«s¨Ì¨¿Ì Eu L2,3 [ XMCD ð 40 T ÜÅÌ¥êÅªè·éª÷ÊÉÜÜêÄ¢é±Æðl¶·éKvª±ÆÉ¬÷µ½ªC»ÌÊÍ³çÉï­ÈÀð¾ç©

Eu3{ Ì@ÉbNí¥«ÌøÊàÌèüê½vZ

Éµ½B±êÜÅCEu3{ ¬ªÍñ¥«ÅÉæÁÄC@ÉbNí¥«Éæé¥»Í Eu2{ ÌéÆµÄC¥» M ÌvZÅÍ»Ìñ^ª³³êÄ¢½ªCXMCD ÉéBÜ½C¥»Éä×Ä\ªÉ¬³¢±ÆðmF·éKvªéBÍ Eu3{ ÌGlM[ÊuÉÙíÉå«ÈMªÏª³ê

ãLÌÏ_©ç_ðüÇµCÜ¸CÀ±Ì¥»Èüð½BEu3{ Ì XMCD ÌUÍC¥CIÈ Eu2{ ÌàÌÌÅ«é¾¯èÊIÉÄ»·é±ÆðÝ½Bê]ÚÌ

1/3©ç1/2ÉàBµÄ¢½BøÊÍ YbInCu4 Åp¢½û@ð»ÌÜÜKpµ½B·ÈEu3{ Íñ¥«ÆµÄ«½ªC³mÉ¾¦Îã¢í¥«í¿Cá¥êÌ V Æ D ÌlðC»ê¼ê0.00313 eV Æð¦·B±êÍ J0 ÌÅáÊÌãÉ J1 ÌãNóÔª0.009 eV ÉCÜ½¥êÌ»êçð0.00164 eV Æ0.012èC¥êÉæé[[}GlM[ÌñÎp¬ªÉæèeV ÉIÑCeÌd¦ð31 T ðSÆµKÈGl¼Òªã­¬·é½ßÅC±ÌøÊÍ@ÉbN

M[ðàÂâë·ÖÆµ½B¿ n Æ¥» M Ìví¥«ÆµÄæ­mçêÄ¢éB½¾µCÊíÍ@ÉZÍCÜ¸»êçð»ê¼êÌÅ¼cçÆS­¯¶û@bNí¥«Éæé¥»Í J7/2Ì Eu2{ Ì¥»Éä×ÉæèvZµC»ÌãeÌd¦Å½Ïµ½àÌi»ê¼

Ä³Å«éÙÇ¬³¢ÌÅñ¥«ÆµÄµÁÄ«½ÌÅ

ê n(h)CM(h)ÆL·jðß½B

152  úËõ May 2014 Vol.27 No.3

ðà ¡ ­¥êºÌ¬´q¿óyÞ»¨É¨¯é X üzû¥C~ñF«ÉC¥«s¨ÉÂ¢Äq×éB¥»ÈüÌ[¥ê

0.0413 eV ÅèCÜ½ F(l)[(S{L{l)2 |1][1|(S|©çÌ§¿ãªèÌÈ¦ÍÀ±ÅÍãÉÊÉÈÁÄ¢éL)2]48i½¾µCLS3jÅ

ªC¼cçÌ_ÅÍºÉÊÉÈÁÄ¢éBÜ½CãÙÇ

q¿ Eu ÌÌmn(h)|2.0nÌÌàÌ¾¯ª Eu3{ ÅéBÀÛÉÍC¬´

ðÍ·éªC[¥êÉ¨¯éÑ¥¦ÌÀ±f[^ÉÍáé±ÆÆC¥«s¨ðO·é½ßÌöq0.95ðl¶·Å¥«©RCIÉÁLÌU¢ª©çêéB±êçÌµÄCEu3{ ¬ª©ç¥»ÖÌñ^Í MEu3{0.95[n(h)|U¢ÍCnÌ Eu TCgÌñ 5 ÷ª¬´q¿óÔÅ2.0]MVanVleck ÆßçêéBÇCSnÌ¥»ÌaÍÍÈ­CEu2{ Ì©RCIÅ

é±Æð¦´µÄ¢éB

MtotMEu2{{MEu3{{Mimp ÆÈéB½¾µC¥»Ì\®Í
·×Ä Euµ½ªÁÄC¥»ÉÎ·é¥«s¨Ìñ^ÆµÄ½èÌ{[A¥qÅ\µÄ¢éB¥»ÌvZÊð Fig. 7(a)É¦µCÀ±ÊÆär·()éB±±ÅÍ MEu2{ ðCMEu3{ ð£CMimp ð¡Å¦µC

Mimp0.05 g7/2 Jz exp (|g7/2 mB Jzh/kBT) /Jz(exp (|g m J h/k T))
Jz

7/2 B zB»êçÌaðÅvbgµÄ¢éBMtot ÍÀ±Ê(5)iqXeVXÌ¥êÁªjðæ­Ä»µÄ¢éB7
T ÈãÌ­¥êÅÍCMEu2{ ªÅàå«Èñ^ðµÄ¢é±Æªí©éBÁÉCñ30 T ÈãÅ¥»ª}ÉÁ·ðl¶·éB±±ÅÍCÀ±ÉÎµÄ·x T4.2 K ðp¢é±ÆªKvÅéi¼Ì¨ÊÉÖµÄÍC4.2 KéÌÍCMEu2{ ÉÎ·éê]ÚÌøÊÉæéàÌÅ
éBêûC7 T ÈºÌ¥êÌæÅÍ Mimp ªÅàxzIÅ

Æ 0 K Ì·Í³Å«éjBOqÌ¥»ÉÎ·é¬´qèC¥»ÈüÌãÉÊÌÈ¦Í±êÉæÁÄ¶¶Ä¢¿ Eu2{ Ìñ^ M(h)ÍC¥«s¨Éæè¬´q¿éBS¥êÍÍÉí½ÁÄCMEu3{ ÍÉßÄ¬³­CMtot

Eu Ì TC g ª95÷ É¸ ­· é± Æ ðl ¶µ Ä MEu2{ ÖÌñ^ÍwÇ³Å«éBÈ¨CFig. 7(a)ÌÌÆ¤

0.95M(h)ÆC³³êéBÜ½nÌ¿ ntot ÍCOqÌ n

Ì_ÉÂ¢ÄÍãÙÇq×éB

(h)ª95÷Éí¸³êéÆÆàÉC¥«s¨ª 2 ¿ÌEu Å

é±Æðl¶µÄ ntot 0.95n(h){0.05~2.0Æ³ÄC¥»ÌvZÉp¢½àÌÆ¯¶fÆp[^[ÌºÅvZ³ê½¿ ntot ð Fig. 7(b)ÉÀüÅ¦·B±Ì ntot ÍC¼cçÌÀ±¨æÑvZÆä×Ä¥êÌSæ©êéBÅãÉC¥»ÉÎ·é Eu3{ Ì@ÉbNí¥«Å¬³¢±Æªí©éB[¥êÌÉÀÅÍñ2.7¿ÆÈ©çÌñ^ð]¿·éBàµSnÌ Eu ª·×Ä Eu3{ CèC¼cçÌlæè0.1¿¬³¢BÜ½C¥êUN¿]éÆ¼è·êÎ¥»ÖÌñ^Í 2 Û®ö®ð

ÚÌN±é30 T ÈãÅÍC}È¿Ìáºª¶¶C40

IÅp¢Ä MVanVleck (h/6)F(l)/(E1 |E0 )Æ^¦çêéB½

T ÅÍ¼cçÌ2.5¿ÉÎµÄC0.34¿à¬³¢2.16¿ð¾µCE1|E0 Í Eu3{ Ì J0 ÅáÊ©ç J1 ãNÊÆéBµ½ªÁÄC40 T ÅÍ¬´q¿óÔÌ84÷ª 2

Ö Ì ã N G l  M [ Ì [  ¥ ê Å Ì l Å C E1 | E0 ¿ÅFig. 7èC¥»ÌÀ±lÆÌÔÌñ®«ÍðÁ³êÄ¢

Field dependence of (a) magnetization and (b) valence of EuNi2(Si0.18Ge0.82)2. In (a), we show experimental
results of total magnetization (dots) and the contributions from Eu2{ (diamonds) and Eu3{ (inverted triangles)
components, and theoretical results of total magnetization (closed circles) and its decomposition into various
contributions. In (b), experimental (closed circles) and theoretical (solid curve) results are shown, in compari­son with those given in ref. 10.

úËõ May 2014 Vol.27 No.3  153

éB±Ìæ¤ÉC¥êUN¿]ÚÈãÌ¥êÅ¿Ì}yNgÌÏª­xäÍùmÅÈ¸­ª¨±éÌÍCntot ªñ30 T ð«ÆµÄCá¥êç¿ªè³êéBÜ½CXMCD ÉÂ¢ÄÍCEu2{ ÆÌ¿©ç¥êÌ¿ÉÚèÏíé½ßÅ

Eu3{ Ì»ê¼êÉÎ·é´qà XAS Æ XMCD ÌÏª­éBMÒªãLÌ_vZðißÄ¢½¿å¤Ç»ÌC

xäªùmÅ

éÌÅCXAS ÌÀ±©

éÌÅCa¥ðKpµÄEu2{ Æ Eu3{ºçªC¢EÉæì¯Äî X üÉÎ·é XASÉXMCDÌ¥»ðÊXÉßé±ÆªÅ«éBÈ¨êÊÉC¬´ð­¥êºÅªè·éuðìé±ÆÉ¬÷µ½B±±Åq¿»¨Ì XAS â XMCD ÌÀ±Êð 2 ÂÌ¿¬àC¬^ÌpX¥êð SPring­8 Ìr[CÉ¿ªÉªð·éÆ«ÉÍCPÈé´qàXyNgÌdËÞ±ÆÉæÁÄªèªsíê½ªC²¿ÉÎ·é§í¹ÅÍÈ­C¬¬ V ÉæéXyNg`óÌÏ`ðléBµ©µC±Ì Eu »¨Í V É

ß@ÅÍÈ­CoN¿ÉÎ·éSdqûÊ@ªÌp³¶·éÌªÊÅê½Bî X üÉæé Eu ÌM4,5 [ XASÉXMCD Í X üæéÏ`ð³Å«éÁÊÈáÉÈÁÄ¢éB»êÍCÉæéJÚª Eu Ì 3d ©ç 4f ÖÌJÚÅ

é½ßCd X

XAS É¨¢Äà XMCD É¨¢ÄàC´qà½d\¢üÉæé Eu 2p­5d JÚæèà Eu Ì 4f óÔÉÖ·ém©

Í10 eV ÈãÌXyNgÍÍÉLªÁÄ¢éÌÉÎµð¼ÚÉ¾çêé_ªéBÁÉCXMCD ÉÎ·éa¥ðKp·êÎCEu2{ Æ Eu3{ Ì 4f dqÌ¥»ðÊXÄC¬¬ V Ìå«³ÍÍ©0.001 eV ÌI[_[µ©È¢©çÅa¥ÉÖµÄq×éÆCEu2{ ÌXyNg¬ªÉÎ

Éªè·é±ÆªÅ«C_ÌØÌ½ßÉÍàÁÆàÓ
³íµ¢À±û@ÅéB»±ÅCEuNi2(Si0.18Ge0.82)2 ÌéBµÄÍC4f dqÌO¹¥C[gª 0 ÅéÌÅC

Eu M4,5 [ XAS É XMCD Ì ª è ð  º ç É ¨ è ¢ µ C¥» ÍXs a¥©ç ßé±Æª Å«éBê ûCf[^ðÍ¨æÑ_ÆÌärÉÍMÒàQÁµÄ¤¯¤

Eu3{ ¬ªÌ@ÉbNí¥«ÉÎµÄÍCqJzr028)ð¨±ÈÁ½B

ÅFig. 8(a)Æ 8(b)ÍC»ê¼ê Eu M5 [ XAS Æ XMCDÌ¥êË¶«ÌÀ±ÊÅ èCÅå¥êÍ21 T ÅéBéÌÅ¥»ÍO¹[gÉÎ·éa¥ðKp·

é±ÆÉæèßé±ÆªÅ«éBa¥Ì\®ÍÈª·éªCÚ×Í¶£17,18)ðQÆ³ê½¢B

XAS ÉÎ·é¥êË¶«Í¬³­Cêû XMCD ÅÍå

S¥»ÉÎ·é Eu2{ Æ Eu3{ Ìñ^Ía¥©çß«È¥êË¶«ªFßçêéBf[^ðÍÌæêiKÍC

çêC»êçÍ Fig. 7(a)ÉÆÞÅ¦³êÄ¢éBEu2{±êçÌÀ±f[^ð Eu2{ Æ Eu3{ Ìñ^Éªð·é±Ìñ^ÅéÉÍC¬´q¿Ì Eu2{ ¬ªÌñ^Æ¥é B » ê ¼ ê Ì © R C I  É Î · é XAS Æ«s¨Ì Eu2{ Ìñ^ª¤ÉÜÜêÄ¢é©çCvZXMCD ÌXyNgÍ´qà½d\¢ÉæÁÄÜÊÆär·éÛÍÆ¡ÌaªärÌÎÛÆÈéBÀ±ÆÆÅèC»êçÍùÉoÅ³êÄ¢éÌÅC»ÌÊðp¢évZÌÊÍ\ªÉæ­êvµÄ¢ÄCíêíêÌvZÍ

±ÆªÅ«éBêáÆµÄC16 T É¨¯é Eu M5 [ÌMÅ«é±ÆªØ³ê½BEu3{ ¬ªÌ@É

XAS Æ XMCD ðCEu2{ Æ Eu3{ Ìñ^ÌaÆµÄÄ»bNí¥«Ìñ^ÍC_ÉÀ±ÆàÉ\ª¬³­Cdµ½àÌð Fig. 8(c)Æ 8(d)É¦·B±Ìæ¤ÉµÄ 2 Â

X üÌ XMCD Å Eu3{ ¬ªÉÎµÄÏª³ê½å«ÈMÌ¬ªÌUªÜêÎCEu2{ Æ Eu3{ Ì´qà XAS X

ª 4f dqÌ Eu3{ ¬ªÉR·é±ÆÍ¾mÉÛè³

Fig. 8Experimental results of (a) XAS and (b) XMCD of EuNi2(Si0.18Ge0.82)2 with various magnetic elds. The ttingsof XAS and XMCD at 16 T are shown in (c) and (d) by the superposition of Eu2{ and Eu3{ components.

154  úËõ May 2014 Vol.27 No.3

ðà ¡ ­¥êºÌ¬´q¿óyÞ»¨É¨¯é X üzû¥C~ñF«ê½BùÉq×½æ¤ÉCL2,3 [Ì XMCD Í Eu 5d dq
Ì¥»ð½fµÄ¢éÌÅC»Ì´öª 5d_4f ð·ÝìpÅé±ÆàC»¤ÅÈ¢±Æàè¤éBEu3{ ¬ªÉÖµÄÍC4f dqÌ¥»ª´öÅÍÈ­CÊÌ´öC½Æ¦Îã¢¥»ðàÂ Ni 3d dqÆ Eu 5d dqÌ¬¬ª´öÅÍÈ¢©Æl¦çêéBM5 [Ì XAS ©çßçê½¿Ì¥êË¶«ð Fig. 7(b)ÉÅ¦·B±ÌÊÍíêíêÌvZÊÆæ­êvµC±±ÅàMÒÌ_Ì³µ³ªØ³ê½B¼cç
ÌÀ±ª¿Ìå«¢¤É¸êÄ¢éRÍ¡ÌÆ±ëÜ
¾ m è µ Ä ¢ È ¢ ª C ­ È ­ Æ à î X ü Ì XAS ÆXMCD ÌÀ±ÊÍù¶Ì¥»ÈüÆàµªÈ­CMÒÌ_ÊÆæ­êv·é±Æªí©Á½B
ÅãÉ±Ì_ðLÀ·xÉg£µC[¥êÅÌ¿âÑ¥¦Ì·xË¶«ðvZµCù¶ÌÀ±ÊÆär·éBá·ÅÌ¥êUN¿]ÚÌðÍÅÍîêóÔ |grÌvZ¾¯ªKvÅ

Á½ªC¡xÍ·×ÄÌãNóÔðl

¶µC{c}ªzÌºÅ¿âÑ¥¦ðvZ·éBÜ½Cx[XÌóÔÆµÄ |0rÆ|7/2, Jz, crÌ¼ÉCEu3{Å J0 ÌÊÌãÉé J1 ÌãNóÔ|1, JzrÌe¿àÌèüêéBãÅ©éæ¤ÉCÑ¥¦Ì·xË¶«ÉÍq
XeVXªÏª³êÄ¢ÄC·xUN¿]Úàê]ÚÅ

Fig. 9Temperature dependence of the total magnetization (solid
circles) of EuNi2(Si0.18Ge0.82)2 calculated at 0.5 T, and its
decomposition into contributions from Eu2{ and Eu3{ andmagnetic impurities. The theoretical result of magnetic sus­
ceptibility is shown in the inset, and compared with the ex­perimental one observed by Mitsuda (unpublished).

é±ÆªmçêÄ¢éBµ½ªÁÄCp[^[Ì V Æ D ÍCá·Æ·ÅÙÈÁ½lðÆéà

ÅÍ¥«s¨Ìñ^ªÅàxzIÅ

é±Æªí©éBèC[±ÌÊðÑ¥¦É¼µÄC}ü}ÉÅ¦µCÀ±Æä¥êá·Æ 0 K Ìá¥êÍ¤ÊÌp[^[ðàrµÄ¢éBvZÊÍ¸·ßöÉ¨¯éÀ±ÌÑ¥¦Æ

ÌÆ·éi½¾µCá·á¥êÍêÂÌÅÂjBvZÉæÁÄßçê½¿Ì·xË¶«i[¥ÉßÄæ­êvµÄ¢éB±êÉæÁÄCMÒÌ_ªÃêºjð Fig. 6(a)ÉÀüÅ¦µCacçÌÀ±ÊijÈàÌÅé±ÆªüßÄmFÅ«½BÜ½Cá·É¨

Æär·éBvZÊÍÅá·xiñ10 KjÌÀ±_ 1¯éÀ±ÆvZÌêvÍC¥«s¨ÆµÄ0.5÷Ì©RÂð¢ÄCÀ±Êð©Èèæ­Ä»·é±Æªí©

Eu2{ CIð¼è·é±ÆÌÃ«ðt¯Ä¢éB

éBÀ±ÊÍÅá·xÅ¿ª}ÉåµÄñ2.8¿
ÉÈéÌÉÎµÄCvZÊÍá·ÉÀÅÍ¿Ì·xË¶«ªÈ­Èèñ2.7¿É¿­BMÒÌ_ÅÍC±ÌnÌ¬´q¿óÔÍá·âá¥êÌÉÀÅÍñíÉÀ
èÅèC}È¿Ì·xË¶«â¥êË¶«ª¶¶é±ÆÍÈ¢BÜ½Cá·á¥êÍêÂÌÅéÌÅC

4. ¨íèÉ
Åßiàªµ¢­¥êºÌ¬´q¿óyÞ»¨Ì
XAS Æ XMCD ÌÀ±f[^ÉÎµÄCs¨A_[\Í^Éæé_ðÍªLøÅ

é±Æð¦µ½B{á·i[¥êjÉÀÌ¿Æá¥êi0 KjÉÀÌ¿

ÍóyÞ³fÌüúnÅ

ÍRêvµC»ÌlÍ2.7¿ÅÍ^ÅÍPêÌóyÞTCgÅß·éªC»ÌÛÉC¼éBéàÌðCs¨A_[\ÉÑ¥¦Ì·xÏ»ðvZ·éBÅßCî X ü

Ì·×ÄÌóyÞTCg©çÌe¿Ífp[^[XMCD ÌÀ±Æ¯¶¿ÉÎµÄCÑ¥¦Ì·xË¶«lÌÏ»ÆµÄLøIÉæèÜêé±Æð¼è·éB±ª Ï ª ³ ê C » Ì  Ê ª Fig. 9 Ì } ü } É ¦ ³ ê Ä ¢Ì¼èÌÃ«Í¡ãTdÉá¡µÈ¯êÎÈçÈ¢ªCé29) B¸·ßöÌÊªÅC~·ßöÌÊªÅ¦­È­Æà»_ÅÍñíÉLøÈßIè@³êÄ¢éªC»ÌÔÉÍqXeVXªÏª³êÄ¢Û_Æ¢¤è²½¦ð¾Ä¢éBé¢Í»

éBÀ±Í0.5 T Ì¥êÌºÅsíê½ÌÅC_vZÅ

YbInCu4 Æ YbAgCu4 É Î µ Ä Í C Yb L2 [ Ì  Ì

àÜ¸0.5 T É¨¯é¥»Ì·xË¶«ðß½BÊ

XMCD Ì¤ªXÉiW·é±ÆðúÒµ½¢BêûCÍC¬´q¿Ì Eu2{ Æ Eu3{ Ìñ^Æ¥«s¨i0.5

EuNi2 (Si0.18Ge0.82)2 ÉÖµÄÍC_vZÆî X ü XAS

÷Ì©R Eu2{ CIjC¨æÑ»êçÌaÉª¯Ä Fig.

ÉXMCD ÌÀ±©çCd X ü XASÉXMCD ÌÀ±

9 É¦³êÄ¢éB±±ÅàCEu3{ Ì@ÉbN

ÅñN³ê½âè_ªTËðÅ«½Bµ©µC×É¨í¥«Ìñ^ÍÉßÄ¬³¢BÜ½Cñ20 K ÈºÌá·¢ÄÍÈ¨C®SÈðÉÍÁÄ¢È¢Bd X ü XAS

úËõ May 2014 Vol.27 No.3  155Éæé¿Ì¥êË¶«ÉÖµÄÍCÄÀ±ÉæéØª]ÜêéBd X ü XMCD É¨¯é Eu3{ Ìå«ÈM
ÍC4f dqÌ¥»ÉNö·é 5d dq¥»ðÏª·éàÌÅÈ¢±ÆªmFÅ«½ªC5d dqÌ¥»ÌÚ×È´ö

14)
15)
16)
17)

ÍÜ¾®SÉÍð¾³êÄ¢È¢Bî X ü XASÉXMCD
À±É¨¯éÅå¥êÌÁÆÆàÉC¡ãÌ¤ÉúÒ
µ½¢B

18)
19)

Ó«
{¤ÍCÈw¤ïâàÉîÕ¤iCju­¥ê20)ºÌ¬´q¿óyÞ»¨Ì X üzû¥C~ñF«Æ

21)¤Â X ü­õªõÌ_viÛèÔF22540341C2010

22)

N`2012NxCã\ÒF¬JÍYjÌêÂÆµÄs³
ê½±ÆðLµÄCÓ«Æµ½¢BÜ½CÀ±f[^ðñµÄº³Á½½­ÌûXCÆèí¯CìK_VC¼cN
OCºNçCÂCNYÌeðÍ¶ßÆ·é·×ÄÌ¤¯¤ÒÌûXÉ´ÓÌÓð\µ½¢B

Ql¶£
1)

2)
3)

4)
5)
6)

7)
8)

9)

10)

11)

12)

13)

½Æ¦ÎCF. M. F. de Groot and A. Kotani: Core Level
Spectroscopy of Solids (CRC, Boca Raton, FL., 2008) ðQÆD
J. C. Parlebas, K. Asakura, A. Fujiwara, I. Harada and A.
Kotani: Phys. Rep. 431, 1 (2006).
J. P. Kappler, A. Herr, G. Schmerber, A. Derory, J. C.
Parlebas, N. Jaoun, F. Wilhelm and A. Rogalev: Eur. Phys.
J. B 37, 163 (2004).
A. Kotani: Phys. Rev. B 78, 195115 (2008).
A. Kotani: Eur. Phys. J. B 72, 375 (2009).
Èw¤ïâàÉÁèÌæ¤u100eXÌæÌ­¥ê
XsÈwvi2005Nx`2009NxCã\ÒFìK_VjE¯îÕ¤iS)u´­¥ê«qÉXMCD ÉæéÊq¥C
ÎÉÌð¾v
i2011Nxæèp±Cã\ÒFìK_V)D¼cNOCî©rÆCåacªñCìK_VFÅÌ¨
42, 881 (2007)E¼cNOFÅÌ¨ 44, 577 (2009).
T. Nakamura, Y. Narumi, T. Hirono, M. Hayashi, K.
Kodama, M. Tsunoda, S. Isogami, H. Takahashi, T.
Kinoshita, K. Kindo and H. Nojiri: Appl. Phys. Express 4,066602 (2011).
Y. H. Matsuda, T. Inami, K. Ohwada, Y. Murata, H. Nojiri,
Y. Murakami, H. Ohta, W. Zhang and K. Yoshimura: J.
Phys. Soc. Jpn. 76, 034702 (2007).
Y. H. Matsuda, T. Inami, K. Ohwada, Y. Murata, H. Nojiri,
Y. Murakami, A. Mitsuda, H. Wada, H. Miyazaki and I.
Harada: J. Phys. Soc. Jpn. 77, 054713 (2008).
Y. H. Matsuda, J. L. Her, T. Inami, K. Ohwada, Z. W.
Ouyang, K. Okada, H. Nojiri, A. Mitsuda, H. Wada, K.
Yoshimura, H. Amitsuka, N. Kawamura, M. Suzuki and A.
Kotani: J. Phys. Conf. Ser. 190, 012019 (2009).
Y. H. Matsuda, Z. W. Ouyang, H. Nojiri, T. Inami, K.
Ohwada, M. Suzuki, N. Kawamura, A. Mitsuda and H.
Wada: Phys. Rev. Lett. 103, 046402 (2009).
T. Nakamura, Y. H. Matsuda, J.­L. Her, K. Kindo, S.
Michimura, T. Inami, M. Mizumaki, N. Kawamura, M.
Suzuki, B. Chen, H. Ohta, K. Yoshimura and A. Kotani: J.
Phys. Soc. Jpn. 81, 114702 (2012).

156  úËõ May 2014 Vol.27 No.3

23)
24)
25)

26)

27)
28)

29)

A. Kotani, Y. H. Matsuda and H. Nojiri: J. Phys. Conf. Ser.
190, 012013 (2009).
A. Kotani: Eur. Phys. J. B 85, 31 (2012).
A. Kotani: J. Phys. Conf. Ser. 430, 012002 (2013).
T. Nakamura, T. Hirono, T. Kinoshita, Y. Narumi, H.
Nojiri, A. Mitsuda, H. Wada, K. Kodama, K. Kindo and A.
Kotani: J. Phys. Soc. Jpn. 81, 103705 (2012).
A. Kotani and T. Nakamura: J. Phys. Soc. Jpn. 82, 044710(2013).
O. Gunnarsson and K. Sch äonhammer: Phys. Rev. B 28,
4315 (1983).
N. V. Mushnikov, T. Goto, K. Yoshimura and W. Zhang:Physica B 334, 54 (2003).
A. Kotani, H. Ogasawara, K. Okada, B. T. Thole and G. A.
Sawatzky: Phys. Rev. B 40, 65 (1989).
n~gjAÌ Vk,n ª¤ÊÅàzÊqohÌdq[UxªÙÈêÎ¬¬øÊÍÙÈéB¶£15) ÅÍCêÊÌ[UxÉÎµÄàKpÂ\Èæ¤ÉCV NB/WVk,n ÆµÄ¢éÌÅC±±Åà±Ìè`Éµ½ª¤±ÆÉ·éB½¾µCzÊqohÌóÔð NCdq[Uxð B/W ÆµC
Vk, n Ì k, n Ë¶«ð³µÄ¢éB
A. Kotani: Eur. Phys. J. B 81, 49 (2011).
A. Kotani: J. Electron Spectrosc. Relat. Phenom. 181, 168(2010).
H. Wada, A. Nakamura, A. Mitsuda, M. Shiga, T. Tanaka,
H. Mitamura and T. Goto: J. Phys. : Condens. Matter 9,7913 (1997).
æ 2 ßÅÍCêdqi é¢Íê³EjÌp^®Êð\í·ÌÉ¬¶i jCjz ÈÇjðp¢½ªC±±ÅÍ¡Ì 4f
dqÌ¬p^®Êð\í·½ßÉå¶i JCJz ÈÇjðp¢Ä¢éBM. Oko, K. Okada, I. Harada, K. Akabli and T. Diep: J.
Phys. Soc. Jpn. 79, 024713 (2010).
ÔIÆµÄÍCÜ¸_vZªæsµC»Ìãî X
üÀ±ÉæÁÄ_ÊÌØªÈ³ê½B_¶­\ÌiKÅÍCÀ±Æ_ðêÉµÄ¶£17,18)ðoÅµ½B
A. Mitsuda: unpublished data.

ÒÐî
¬JÍY

åwÉ¼_³öCGlM[Á¬í¤@\¨¿\¢Èw¤É¦Í¤õE­mail: kotanipost.kek.jp
êåF¨«_mªðn
åw@mÛöC¹ãC1969NÉåãå
wîbHwèC1972Nåw¨«¤èC1977Nkåwà®Þ¿¤
³öC1981Nåãåww³
öC1987Nkåww³öðoÄC
1990NÉåw¨«¤³öÆÈè.
2003 N É   å w ¨ « ¤   ð è N Þ¯Båw¼_³öB»Ìãà¤ðp±µCÆ§s­@l»w¤d¤qõåÇ¤õCñsåwqõ³
öCGlM[Á¬í¤@\¨¿\¢Èw¤¤¯¤õÈÇðoÄC»ÝÉéBðà ¡ ­¥êºÌ¬´q¿óyÞ»¨É¨¯é X üzû¥C~ñF«

Magnetic circular dichroism of X­ray absorption
spectra for mixed valence rare earth compounds
in high magnetic fields
Akio KOTANIAbstract

Photon Factory, Institute of Materials Structure Science, High Energy Accelerator
Research Organization, Oho 1_1, Tsukuba, Ibaraki 305_0801, JapanA review is given mainly from a theoretical viewpoint on the spectra of X­ray absorption magnetic
circular dichroism (XMCD) for mixed valence rare earth compounds in high magnetic elds. The
technique of measuring XMCD spectra in pulsed high magnetic elds up to 40 T was recently de­veloped in Japan, and interesting experimental data were obtained for Yb and Eu compounds. It
was found, however, that some puzzling problems were included in these data. I would like toshow in this article how these puzzles were solved.

úËõ May 2014 Vol.27 No.3  157