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Superconducting gap nodes in PrOs_4Sb_12

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JournalofMagnetismandMagneticMaterials0(20081–0
arXiv:cond-mat/0608122v1[cond-mat.supr-con]4Aug2006
www.elsevier.com/locate/jmmm
SuperconductinggapnodesinPrOs4Sb12
S.H.Curnoea,T.R.AbuAlruba,I.A.Sergienkob,I.Vekhterc
aDepartmentbMaterials
ofPhysics&PhysicalOceanography,MemorialUniversityofNewfoundland,St.John’s,CanadaScienceandTechnologyDivision,OakRidgeNationalLaboratory,OakRidge,TN37831,USA
cDepartmentofPhysicsandAstronomy,LouisianaStateUniversity,BatonRouge,LA70803,USA
Received12June2005;revised13June2005;accepted14June2005
Intheyearssincethediscoveryofmultiplesuperconduct-ingphasesinPrOs4Sb12experimentalresultsconcerningthesymmetryofthesuperconductingstateshaveprolif-erated,butsofarnotheoreticaldescriptioniswidelyac-cepted.Ourstartingpointisastrictanalysisofsymmetryandsymmetry-breakingdescribedbyLandautheory[1,2].Thisapproachmakesdeﬁnitestatementsaboutthesym-metryandgapnodesofpossiblesuperconductingstates.Inthisproceedings,weextendthisanalysistodiscussthepossibleexistenceofdeepdipsinthegapfunction,andhowtheymaybeobservedexperimentally.
PrOs4Sb12hastwosuperconductingphases,asobservedinthermalconductivity[3]andseveralothermeasurements[4,5,6],the‘A-phase’,whichbordersthenormalphaseontheH-Tphasediagramandthe‘B-phase’whichappearsjustbelowit.TherearemoreexperimentalobservationsoftheB-phasethantheA-phase,inpartbecauseitoccupiesamuchgreaterareaofthephasediagram.Variousmea-surementshavedeterminedthattheB-phasehastripletpairing,breakstime-reversalsymmetry[4]andhasnodesornear-nodesinthe[001]directionsofthegapfunction[3,5].Someexperimentshaveinterpretedthedoubletran-sitionintermsofmulti-bandsuperconductivity[7],suchthattheA-phaseandB-phasepossessthesamesymmetry.AthirdsuperconductingphasehasbeendetecteddeepinthesuperconductingregionoftheH-Tphasediagram,butitssymmetrypropertiesarepresentlyunknown[8].

S.H.Curnoeetal.

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