Surface-electronic structure of La(0001) and Lu(0001)

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1、Surface-electronicstructureofLa(0001)andLu(0001)D.Wegner,1A.Bauer,1Yu.M.Koroteev,2,3G.Bihlmayer,4E.V.Chulkov,2,5P.M.Echenique,2,5andG.Kaindl11Institutf¨urExperimentalphysik,FreieUniversit¨atBerlin,Arnimallee14,14195Berlin-Dahlem,Germany2DonostiaInternationalPhysicsCenter(DIPC),PaseodeManuelLardizaba

2、l4,20018SanSebasti´an/Donostia,BasqueCountry,Spain3InstituteofStrengthPhysicsandMaterialScience,RussianAcadamyofSciences,634021Tomsk,Russia4Institutf¨urFestk¨orperforschung,ForschungszentrumJ¨ulich,D-52425J¨ulich,Germany5DepartamentodeF´isicadeMaterialesandCentroMixtoCSIS-UPV/EHU,FacultaddeCienciasQ

3、u´imicas,UPV/EHU,Apdo.1072,20080SanSebasti´an/Donostia,BasqueCountry,Spain(Dated:November17,2005)Mostspectroscopicmethodsforstudyingtheelectronicstructureofmetalsurfaceshavethedis-advantagethateitheronlyoccupiedoronlyunoccupiedstatescanbeprobed,andthesignaliscutattheFermiedge.Thisleadstosignificantun

4、certainties,whenstatesareveryclosetotheFermilevel.Byperforminglow-temperaturescanningtunnelingspectroscopyandabinitiocalculations,westudythesurface-electronicstructureofLa(0001)andLu(0001),anddemonstratethatinthiswaydetailedinformationonthesurface-electronicstructureveryclosetotheFermienergycanbeder

5、ivedwithhighaccuracy.PACSnumbers:73.20.At,71.20.Eh,73.50.Gr,68.37.Ef,71.15.MbAfterthefirsttheoreticalpredictionofaTamm-likestructuresarenotavailableforLa(0001)andLu(0001)surfacestateonGd(0001)[1],surfacestateswithdz2uptonow.Wethereforeperformedlow-temperatureSTSsymmetryaroundthecenterofthesurfaceBril

6、louinzonestudiesandband-structurecalculationsforthesetwolan-(BZ)havebeenfoundonalltrivalentlanthanidemet-thanidesurfaces.Inthepresentwork,wecomparethealsbyphotoemission(PE)andinversephotoemissiontheoreticalandexperimentalresults,andweshowthat(IPE)[2,3,4,5,6,7].Inallcases,thesurfacestate–withthehelpo

7、fthecalculatedsurface-bandstructurewasfoundtobelocatedveryclosetotheFermienergy,–theSTSdatacanbedescribedaccuratelybysimpleEF,wheretheaccuracyoftheseexperimentalmeth-modelswhichdonotonlyyieldsurface-s