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1、REVIEWSOFMODERNPHYSICS,VOLUME84,OCTOBER–DECEMBER2012Acommonthread:ThepairinginteractionforunconventionalsuperconductorsD.J.Scalapino*DepartmentofPhysics,UniversityofCalifornia,SantaBarbara,California93106-9530,USA(published8October2012)Thestructures,thephasediagrams,andtheappearanceof
2、aneutronresonancesignalinganunconventionalsuperconductingstateprovidephenomenologicalevidencerelatingthecuprates,theFe-pnictidesandchalcogenidesaswellassomeheavy-fermionandactinidematerials.Single-bandandmultibandHubbardmodelshavebeenfoundtodescribeanumberoftheobservedpropertiesofthes
3、ematerialssothatitisreasonabletoexaminetheoriginofthepairinginteractioninthesemodels.Inthisreview,basedontheexperimentalphenomenologyandstudiesofthepairinginteractionforHubbard-likemodels,itisproposedthatspin-fluctuationmediatedpairingisthecommonthreadlinkingabroadclassofsuperconductin
4、gmaterials.DOI:10.1103/RevModPhys.84.1383PACSnumbers:74.10.+v,74.20.Mn,74.70.XaCONTENTSseewhattheytellusaboutthepairingmechanisminthese1materials.I.Introduction1383WebegininSec.IIbylookingatthecrystalstructures,theII.CommonFeaturesofaClassofUnconventionalphasediagrams,thecoexistencean
5、dinterplayofantiferro-Superconductors1384magnetismandsuperconductivity,andaneutronscatteringA.Structures1384spinresonancewhichisobservedinthesuperconductingB.Phasediagrams1386phase.OnefindsthatthesematerialscomeinfamilieswhichC.Coexistenceandinterplayofantiferromagnetismhavequasi-2Dlay
6、erscontainingsquarearraysofd-orandsuperconductivity1387f-electroncations.Theirtemperature-dopingandmagneticD.Aneutronspinresonance1390fieldphasediagramsshowantiferromagnetismincloseprox-III.Models1391imity,orinsomecasescoexisting,withsuperconductivity.A.Thecuprates1391Avarietyofexperim
7、entsshowthattheantiferromagnetismB.TheFepnictides1395andsuperconductivityarestronglycoupled.AspinresonanceC.Theheavy-fermionmaterials1396peak,whichisobservedininelasticneutronscatteringexperi-IV.ThePairingInteraction1397mentsinthesuperconductingphase,providesevidenceofA.Thesingle-band
8、Hubba
