J.Phys.:Condens.Matter10989)7487‑7491.PrintedintheUK
7488 LettertotheEditor
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Figure1.Temperaturedependenceofelectricalresistivityp(T)ofCeRuSn3(curveA)and LaRuSn3:as‑growl1(curveB),annea置ed(curveC)」nsetshowstemperaturedependenceof magneticresistivitypm=p(CeRuSn3)‐p(LaRuSn3(curveC)).
methodusillgatr卜arcfurnace.Sampleswereannealedat950。Cfortllreedays.For transportmeasurements,sampleswerecutintorectangularrodsbyasparkcutter.
FigurelshowsthetemperaturedependenceoftheelectricalresistivityforCeRuSn3 andLaRuSn3.ForCeRuSn3,theresistivityincreasesatleastdownto1.3K.All
CeRuSn3samplesmeasuredhavealmostthesameresistivityofabout470±40μ Ωcm
at3UUKandaboutG7U±50μ Ωcmat1.3K.Wehaveplottedthemagneticresistivity ρm(ρm=ρceRusn3‑PLaRuSn」)Illtlleinsetoffigure1.Theρmisproportionalto‑10gT
between3UUKand70K.Atthepresentstage,itisnotclearwhywedonotseeadecrease inresistivitycluetothecoherenceeffectatlowtemperatures.
Inordertostudythedependenceoftheresistivityonheattreatments,werepeated theriieasurementafterannealingCeRuSn3underdifferentconditions:1000。Cforthree days;950。Cfortllreedays;600。Cfortwoweeks.ThereISnodetectablecllangeof theresistivity.Int1】ecaseofLaRuSn3,tlleeffectofanneali且1gontlletemperature dependenceoftheresistivityislargerthanthatonCeRuSn3.Theresistivityofanas‑
grownsampleincreaseswithdecreasingtemperature,reachesabroadmaxirilumanti thendecreasesatlowertemperatures.Forasampleannealedat95U°Cforthreedays, theresistivityshowsnormalmetallicbehaviour.LalZuSn3showsatransitiontoasuper‑
conductingstateat7㌔ 空1.5K.
Figure2showsthetemperaturedependenceoftheinversemagneticsusceptibility ズlofCeRuSn3between1.7and300K.TliesusceptibilityfollowstheCurie‐Weisslaw abovelOUK.TheparamagneticCurietemperatureandtheeffectiveBohrmagneton μe∬areabout‑38Kand2.5μBmo1‑1respectively.ｵelfisclosetotllevalueforCe3+
(2.56μB).Thesusceptibilityshowsalargevalueofabout1.5×10‑1emulmorlat1.7K, whichisaboutnvetimesaslargeastllevaluestllatllavebeenobservedforCeCu6,CeAl3 andCelnCu2.ThepreliminaryAcsusceptibilitymeasurementbelow1.7Krevealsa
LettertotheEditor 7489
fコ5歪}×Fl
400
zoo
0 100 zoo
TIK)
Figure2.TemperaturedependenceofinversemagneticsusceptibilityX‑'(T)ofCeRuSn」.
6
ら
てU︹∈◎09
2
1
?マ
10 100
T(KI
Figure3.Tempera電uredepeIldenceofHallcoemcientRll(T)ofCeRuSn3(●)andLaRuSn3 (O)atl.OT.ThebrokencurveIScalcu置atedfromequatiol1(1)・
LaRuSn31Sl。6x10}4emumorlat300Kandisalmostindependentoftemperature clownto1.5K.
Figure3showsthetemperaturedependenceoftheHallcoefficientRN.TheHall coemcientofLaRuSn3is2xIO‑10m3C‑1at3UUKandisweaklytemperaturedepen‑
dent.Theestimatedcarrierdensitybasedonasinglecarriermodelisnormalmetallic (3xIO28electronsm‑3at300K).TheHallcoefncientofCeRuSn3increaseswith decreasingtemperatureandhasalargevalueof6.8xIU̲8m3C‑1atZK.TheHall coefficientofthisf‑electronsystemisstillincreasingat2K.AccordingtoColemanand
co‑workers[9],theHallcoefficientcluetoskewscatteringbyindependentCeimpurities
isgivenby
RH〜gｵBPmX(1‑XT)(1)
wheregisthegyromagneticratioofthefelectronandXisthenormalisedsusceptibility
749() LettertotheEditor
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い 10
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Figure4.Temperaturedependenceofthetllermoelectricpower∫(T)ofCeRuSn,(curves AandB)andLaRuSn3(curveC).
X=x/C(CbeingtheCurieconstant).Infigure3thebrokencurveshowsRHcalculated byeyuation(1).Inordertoobtainagoodfit,wemultipliedpmbyafactorof3.3.All theseexperimentalfeaturesarecharacteristicofCedenseKondocompounds.
Figure4showsthetemperaturedependenceofthethermoelectricpower.Compared totheotherproperties,thedependenceofthermoelectricpoweronthesampleislarger.
Thetemperaturedependenciesmeasuredondifferentsamples,however,havecommon characteristics.Infigure4,twoexamplesofthetemperaturedependenceofCeRuSn3
areshown.Weobserveanegativesharpminimumaround6K,andapositivebroad maximumaround80K.Thesignofthermoelectricpowerispositiveat300K,though thepositivevalueisso1τ1ewhatsmallercomparedtogeneralCeKondocompounds.
Maekawaandco‑workersanalysedthethermoelectricpoweroftheCeKondosystem theoretically[10].Theyobtainedpositivethermoelectricpowerinallthetemperature range,unlesstlleytakeliltOacco田1ttllepotelltialscatteringanti/orcoherenceeffectof electronscatteringbyCeions.SinceillCeRuSn3tllecoherenceeffectisIlotclearlyseen
inresistivityorHalleffectinthistemperaturerange,theeffectofpotentialscatteringis thepossibleoriginofthenegativepeaknear6K.ForLaRuSn3,tllermoelectricpower at3UOKispositiveanddecreasesmonotonicallywithloweringtemperaturewithout changeofsigndownto7そ.
Figuresshowsthetemperaturedependenceofthespecifcheatcoefficientdivided bytemperature,C/T,ofCeRuSll3betweenO.6and20K.TheC/7「hasaminimum around7Kthenincreasesatlowertemperatureswithoutanysignofphasetransition downtoO.6K.AtO.6K,itreaches1.40Jmol‑1K‑2,whichiscomparablewiththoseof CeCu6,CeA13andCell1Cu2.TheC/τversusTcurvebearsacloseresemblancetothat ofCelnCu2,althoughC/Tstartsincreasingatasomewhathighertemperatureandshows
saturationbelow1KiilCeli1Cu2.
Tosummarise,thepresentexperime11talresultssuggestthatCeRuSn3isanewheavy‑
fermioncompound.ItshowsnomagneticorderingdowntoU.6K.Therestillremain severalquestionstobeansweredinordertoclarifythelow‑temperaturebehaviour.
Tothisend,measurementsonsampleswithcontrolledstoichiometryandatlower
temperaturearenowinprogress.
∠,e〃er'0〃 彦θ 、Edi'0ノ ・
74y1
N‑とマちE﹁}ド＼匂
1.5
1.0
0.5
oiozo
TlKl
Figure5.TemperaturedependenceofspecificheatcoefficientofCeRuSn」C(T)dividedby temperature・
TheauthorsaregratefuitoProfessorsKYonemi1su,"1'Komatsubara,YOllukialldDr IShiozakifortheirhelpfuidiscussioll.TlleyarealsogratefultoI{okkaidoUniversity SupplyCentrefortllesupplyoflow‑temperatureliquids.
References
111AndresK,GraebnerJEandOttHR1975P/1ys.Rε1,.乙c".351779 [2]OnukiYandKomatsubaraZ'1987J.AlaRri.Alagｺi.Mater63‑64281
【3JStewartGR1984Rev.Ahod.P/1),5.56755
【4】MeisnerGP.GiorgiAL,StewartGR,WillisJU,WireMSandSmith』Ll9841)ノ り・∫.ReU.Le≪.531829
【5】Franc川ol1MN,PercheronA,AchardJC,GorochovU,Counutd,JeromeDandCoqblinB197250"d StnteCori'η1̀'1.1員845,
1610nukiY,FurukawaYandKornatsubara'1'1984ノ.Pノ リ,∫.50c.ノn〃apt532734
[7)UnukiY,Yarnazaki'1',KoboriA,Umi"1',Komatsubara'1',Z'akayanagiS,KatoSandWadaN1987 ノ.P11♪,∫.50c.ノnna't564251
[R)EisennlannBandSchaferH1986ノ.」 しe∬‑Co〃8'πoπ ルfぞ'.12389
191ColemanP,AndersonPWandRamakrisllnalゴ1'V1985P'り,∫.Rev.Le".55414
【IO】MaekawaS,KasibaS,TachikiMalid'TakahashiS1986ノ.P/iys.50c.ノapart553194
PhysicaIIIG5&1GG(1990)443‑444 North‑llolland
CRITICAL卜1AGNETICBEDiAVIORSINCeRuSnx(2.85≦x≦3.15)
T.Fd{uhara,1.Sa1{amoしoandli.Saしo
DepartmenヒofPhysics,TokyoMetropolitanUniversity,Seしagaya‑ku,Tokyol58,Japan
CeRuSn3isreportedtobeaheavyfermioncompoundwit}tanenormouscoefficientofelectronic specificheatyti1.4J/mole・K2.Inordertogainadeeperinsightintotheheavyfennionstate ofCeRuSrn3,wehavemeasしtredresistiviしy,magnetizaしion,magneしicsuscepしibiliしy,Halleffect
andtherrnopoweronCeRuSnr(2.85>̲x>̲3.15).Thelowtemperatureresistivityshowsanｺaxitni.nnatx=U asafしmcしionofx。Sndeficienしsamplesexhibiしtwophasetracxsitionsaし30Kand4K・
1.]N'172U1)UCI'InN
TheinしermeしallLCしernaryeomPoulldCel〜uSnヨ crysしalhzeitlしhecubiePrヨRh4Sn13sしrucしure(( ‑n乙 ))
(fln;iii
s覧]99esし eOmlX)Und。
しhe ar{川nd, Coerricielll J/uioIe・1(2
TranSIX)CL anOllla10し 量S
しheeleetrieal CUI1しinu(,usly COherence
nlsojncreasesdown
skewSeaし しerm9
We 1.1ie iii t.1ｺe
lienし
range しo fer7niOII しranSlx)rし seriesCeRuSn賃
sugpeeし rεUldOlll Wyko「r
Pr3Rh4Sn13 0f P.f.a
Sしfiしe
Sl"、cegrOUP).〔 λ1ヒ・recenし しhaしCeRuSn⊃iganets
Aecordin9しoTal覧ayIulagi Capaciしyexhibi.しonlya
5K.TheelecしrOhic
、reaehesalllI碧 くiI甑 川 馳of
aし0.6K.
;PrOlx∋rし1es(,f behavi{⊃rS.〈4
regisしiviしy{ρ) d()WllしoO,7K
erfeeし,Thelhll 'b しo
yindependel1しCe I,lirtし しhecdbe璽 ・eneeiS O(,C覧 】聾k'1しi()r101、0置 璽igi冒1al曹
h̀}しaしion).Aee(圃 ・dil19しo
sしrucしureissしable nunsしoichinlllPしrie
beU.erunderst,εtnding in('eRUSI13,we andmagneしie
where2.85≦x≦3.15.
Leavy
Speclf】C experimenしs
fer闘11Ctll etf‑1.(3) SmallbUlllP
●'h eaし
abouし1●4
CoRuSn,sho冒 しelllperaしuredecrease5
1hereaseg W1しhOUしshONing coerfieienし(Rl量) 1・7KrｺseXpecしedfromしhe
jmPuriしieg・
desしCol's‑1by Snsiしe(241c
oursしudy, overawicle CC)miX八mds.lnorder
abouしUleheavy haveperrOrmed measUremenしs111the
300K,ρ 〔x=3.(刀)exhjbiしsalogariUlm1C WLしhdeCreaSin9しemperaしUredUe
incoherenしKond()scaし しerin9.
liｺ orρ しhe 3.U9
1.heSnexcessiveuses,
x=3.U.
(ヨt'ilSしie しlsis
⊂⊃く}屋重fi=1ne(i drOP
gUl)erccnulucしitip しheSn c3ecrensing reflecl.ing 3311niul しelllpemture aしXニ3.O.
lO冒 しe川peraしure due
oPPosed Figure orCeRuSn,
becOll亀essmallerIJIしh しemperaしUre(lependenee
isnOしSOmucli TheExcessor5aし%
decreaseo「 ρaし
只川 肋Pleしhe l,yx‑rriy orρ(x=3.15}aし3
し1'RIISjしion cjeficient.cases,p
x,alld sOmekindof 4K.〈sしox
1'P.SISしiviしy,a Thigracし
ロ 1nereage toしherandOll亀
to 2shoNsしhe
(x=3.U,2.91
diCP̲1'Bllし
1nCreageロ toしhe
exしracu{川orl)ure dirfraeしion,ah〔1しhe
.71tisclue orsnj川Pur1しy・
becomeSSn1aller exhibi亀SしiJ(>SしeP
phaseしrahgiし101、9 depelldenceof
ロ Illii?Clll旧 川MIS lx竃ruysuPlx)r隻,s
(⊃fρrOrCeRuSn3 0cel1PaneyofSr、
しheabSOIUしevahle jnCreasin薩X,while
【}rρr【)rxニ3.03ahd rromUlaしror Snくx=3.15)leads吐.o
.10wしemlx≧raしU置'e.」n SIllditS
abrl5Pし しoしhe
●I n Wlしh arwmalies
gear 電.hel(71J r)bserved 豊」La、しtlle
isnoし siしeas しheabove‑menしionedsuss)101011。
ll1agneしicsUseePl,ibiliしyx and2.85)dく)Wllしol.8K.
2.EXP田 己INEM' '1'1ｺe wereprepared
oft.1ｺe 99.98%D hearしh.
foils
PojycrysしallineCeRuSn買sεunPleg byare¶emngaPprOpriaしe別110U11し8 cotesしiしuenしelemenし9くCe99.9%9Ru
anti evacuaしed were parasiしic
x=3, indicaしe
●
Sn99.999%)on Theingotswere
amLealednt quarしzしube・
analyseclby PhaseW85 whileX‑ray
veryweals
aNaしer wraPped 950'( ,
'1'lie X‑ray deしecしed diffracしion Slnglecrysしalsor(;eRuSn
しheCzochralsld furnace.We difrerellce
crysしalsandIx)1ycrysしals.
addiしiona1 3Dave metlrocfin Davetrotobserved inbull【properしies
doledcooper in'CaaiidZr for3daysina sa川plesobしained dirfracヒion,No ltlしhesa川Pleof
paしternsforxf3 rerlecしiOILS.
beengrowllusing aSELL'Ctriarc
anysignificarｺt beしweersin91e
3,RESUi」TSANI)DISCUSSION
Figure1SIIUWSUletemperaしuredependellceof ρforCeRuSn箕(2.85≦x≦3.15).BeしNeen80Kalld
.11
信4QOu G
ヨ
Q
0
T(K)
CeRuSnX
X:
a30e2.97 b3.032・91 c30992.85 d3.15
300
rigorel gremperaしure(lepelldeneeorelecしrical resisしiviしyρofCeRuSn累(2・85≦x≦3・15)・
444
'1'
.F'ukuliara,1.Sakariioto,II.Sato
0.4
02
(Φ石∈︑コE︒)×
0 1
Σ0・2
io
40 (KG) CeRuSnx
goo
21 8 (り︑nEuN﹄F×)エα 4
0 1
、 ㍉ や
1 0。CeRuSn3 .o
・CeRuSn2 ,91
̀4 0‑f
v‑・..・.,
T(K)
goo
T(K)
Fjgure2 Temr)eraしuredependenceofmagneしie suscePしivi」iしyxofCeRuSn.・Theiriseしshows flelddepelldellceofII旧911eしizaし1011aし2K。
Figure3 TemperaしuredependenceofllallcoefficierしRl
ofCe12uSti3,eacrdCeRuSn2 ,0iat101{G.Thebroken curveiscalculaしedfromtheslcewscaしteri㎎
model.
absolutevalueofx(x=3)at1.8(Cislame
lllCOIII[ki['1ROIIt」1しhしh【}seorしypicalLeavy fermioncomPounds,andISraしherclて)setoしhose o「Kondocomrx)undsNiしhmagneしicorder(suchas Ce馬orCeCu2).1しsu99esし5thaしthe
Ix)ssibili.しyorsomemagneしicorYleraし ユosaer
しemperaしureinCeRuSlh,IntheSndeficienし samples,Xiscl.eat・lyenhancedcomparedしox=3・O sample.Theetiltancemenしisespeciallyevidenし below30K,buしnosigni̲ficarｺしkinkorbendcan beseenaroしmd30K.CorresPondin9しothelower
teInperaしureanomalyIllρ,しheb覧 』npaし4K1111X̲
.,.̲..
curvegivesaclearevidenceofamagnet;ic i,r・ansif;i.onforx=Z.85.Forx=2.91,X‑'1'curve onlyshowsasmrillchangeinslopearoしuid4K・
Theinseしinfigure2shoNsthefield dependenceormagneしizaしion(卜1)at2K・M
becα1lP.SlargerwiしhdecreagitigSnconしenし ・
N(x=2,85)a⊥soshowsameしamagneしiebehavioraし
abouし6KG,Thisfacし しogeしherwiしhthesli旧Ll!
bumpitsx‑'1'curvesuggestthatate anしirerromagneしiclongrangeorderdevelops belova4KillCeRuSn2.95。
Figure3chewsthe thellallcoerricienしofCeRuSn3alld
しemperaしuredependenceof
CeRuSn2,91 measuredunder10KG,nlebrokencurveis
calculatedfromtherecenttheoriesbasedonthe
skewscaし しeringbyindependenしCeimpuriしies,
a:1disproportionalしoρ 【え 《4)orPX(1‑X》(5)・
Ilereρ 爾alldρisthemagtreしicεmdthebulls resisti.v.it.yantiXisthenormalized
suscepしibi!ity.Rl(x=3。0)canbefiしtedwell W1しhthecalculaしedcurvedownto2K.'111is
suggesしSt,teattheincohere11しKondoscaし しeririgis
adormtratヒprocess111ariornalousHalleffecteven aしsuchalovatemperaしures・AsTdecreases, It (x‑2.91)showsslightupturnaround4K
ref⊥ecLingしhee璽 皿1ance【lskewscaし しeringdueしo
theonseしofanしiferromagneticordering・
Thesimi⊥aru})しumjsX150seenaし30K,しhough iしisnoしsoclearaslowしemperaしureOI]P̲.
Evenaし300K,iも1(x=2.9i)15abouし60%1arger しhanR"(x=3.O).「PhisfacしimPlyssomeehange ofcarrierconcenし1・aしion,sincetheesしi1nated FillUlll￡1<10USparしpmXcannotexplainしhe
di￡ ￡erence.⊥ しisreasonabLeしoexpecし しhata
deficiencyofSnwillcauseachangeofthe nwnberofelecL‑ronsiretheconductionband.
● ●.
TosuIrunar■ze,thecolnpet1しlon RKKYltlしeractionandKondoeffecしis criticalinCeltuSn3.Thedeficiency
inducesしwosしePphasetransiし10t18aし 33K.Thelocaerしei:operaしureone ateしiferromagneしicordering,Nhileしhe しelnperaしureotteistooしclearaしpresenし Thernicroscopicmeasurements,suciｺas
SCEし しeril19,arenecessarytOCIean
の
Orユ91n・
beしween very ofSn 4Kand 1SFiil
higher sしage.
neuしron upits
ACKNOWLEDGF}1ENTS
TheauしhorsaregratefulしoProressorsS・
TakayanagiandY.()nukiandDrI・Shiozakifor theirhe⊥pfuldiscussion・
REFERENCES
(1) (L)
(3) (4) (5)
P.Eisenma置mandII,Schafer,」.Les‑Com・
Met.123(1986)273.
'1'.Fulcuhara,1.SRIcamoto,11,Sato,S.
TakayanagiandN.Wada,J.Phys・Conaens・
甑 ししer1(1989)7487.
S.Takayanagi,T.Fukuhara,li・Saしo,N・
WallaandY.Yamada,thisvolume.
A.Ferし,A.HarmicandP.N.Levy,J.ト1agn.
&1̀1agn.1̀lati;erG3&64(1987)535.
P.ColemanP.W.AndersonandT.V.
R乏川lakrislma11,F)hys.Rev.Leしt.55(1985) 414.
1'hysica.13165&166(1990)447‑448 Nortlｺ一lfollattci
llEAVY FERMIONBEiiAVIOURINCeRuSn3 COMPOUND
Shigeru a'1'11KAYIINAGI
,TadasiFUKUIIARA, aHid 。y。kiS^TO,bN。b。 。WADA,cY。hYANADA Physi(二sDepartmeI1ヒ,SapPoroCampus,Hokkaido‑KyouikuUniversiヒy,SaPporo,002,Japan.
鴛D・pa・ ・me…fPhysi・s・T・ky・N・ …P・ ・i…U・i・e・siしy・S…g・ya‑k・T・ky・158・J・pa・ ・
Deparしment二 〇fPhysics,CollegeofArtsall(jScience,UniversiヒyofTokyo,Komaba,Tokyol53,Japan.
CN
ationalResearch.lnstituteforìfetal,Nakameguro,Tokyo153,Japan
Theelectricalresistivityunderpressure(upto23kbar),magneticsusceptibilityandspecific heat
scat,。ofri。leRlln瑞thre:ubicisti.Pm3nstrucitybehav二1「ewelik二emeasuradilut:dKl含1ごellpll憲1、and3000w1K,K',he'1'he,maati§neticC/T
remarkablyincreasesandreachesabroadmaximumaroundU.5K.Themagneticsusceptibilityalso showsamaximumatthesametemperature.'Theseresultsindicateaantiferromagnetic‑tpyeordering
}educedermionbyco.theRKKY‐intpounc]withspe:racifi二'￡ 二。bettytco:en4fffici;electntof「onsbelow1.67J/KZ?.5mo、K.a,。.CeRuSn36K.'sanewheavy
1.INTRODUCTION
TheE‑atomspacinginheavyfermionsystems isanimportantparameter,presumablydominated theeffectivewidt二hofthehybridizedfband.
heavyfermioncompoundshavef‐fdistance
9・eaし ・ ・ しha・4λb・y・ ・d・hi・hllillp・i・ ヒ ・ ・ し
t二haヒf‑〔overlapceasesandmagnetismoccurs・
Forexampl
largeCe‑C:・CeA13dista。lldllCl?43hlveanle12鴇le1X
respecヒively.AlmostallthecubicKondocom‑
pounds,suchasCeBGandCeAl20rdermagneti‑
callyatlowtemperaturesexceptCelnCu2which havebeenrecentlyreportedtobeàheavy
fermion spacing
The。compound(1).CelnCu2alsohasla4.8URwhichisclosetothatofxistenceofcompoundswithttief二geCeCeCu6rmula・
1凱ili;ilii『1;i;1轟ili;rtedbyEiscrystallizeucture:Pm3ntly,weh;il
foundthiscompoundtobeanewheavyfermion syst二emwithalargeelectronicspecificheat
・・effi・i・ ・t(3)suchasthaヒ ・fC・C・6・lti・ ・f
●
1nteresヒ CeRuSn3 the
コ
ヒ1V1しy, heat.
extensive
toknowthegroundstatepropertiesof indetail.Inthisletterwereport
iveexperimentalstudiesofresis‑
magneticsusceptibilityandspecific
2.EXPCRIMENTAL
F'olycrystalsofCeRuSn3andLaRuSn3
.werem
eltingargonatmospherebyarcunderobヒained stoi.chiometricamountsof99.9‑Ce,‑Laand
99.98%‑Ru.ThelatヒiceconstantsobtainedbyX‑
rayanalysis・agreewithlitgraturevalues
l:隠1二73A,regr。 聴11〜1。9.77Czo。 櫨 翫ll{1罐1
methodusingatri‑arcfurnace.Sampleswere annealedat95UCfor3days.Theelectrical
resistivitywasmeasuredunderhydrostaしic
pressuresupto23kbarusinga leadmethod,Thepressurewas meansofaCu‑Beclamptype
apparatus.Thespecificheatmeasurements carriedoutbetween50mKand
adiabaticcalorimeters;one
measurementsandtheotherwasmounted dilution‑refrigeratorforlow
surements(50mK‑2K).
standardfour‑
generatedby piston‑cylinder
were 50Kusingtwo
wasfor2‑50K
ina temperaturemea一
3.RESULTSANDDISCUSSIONS
Figurelshowsthetemperaturedependenceof
theelect・icalresi・ ヒi・ityf・ ・C・R・S・3・ ・d
1000
︻5αユ}
0.
SOO
﹂(UO
100
丁
lKl
200 300
Figure1.Temperaturedependenceofelectrical resistivityofCeRuSn3(A)andLaRuSn3:as‑
grown(B),annealed(C).lnsetshowstemperature dependence・fmagneヒicresisしi・ityρm蟹
ρ(CeR・S・3)一 ρ(LaR・Sn3)
448 S.望 駄aJallagl,T.1'ukuhara,li.5a￠o,N.wada,lr1'arnada
暇oα8
e
7
.6緯 趣 ・
S0 50