Publications

Wehaveimplementedlaserphotoemissionspectroscopy(PES)toinvestigatetheelectronicstructureof the iron-basedsuperconductor(La,Eu)FeAsO1-xFx (LaEu1111)whichisaninterestingcompoundinthe “1111” family showingahighvalueofthesuperconducting(SC)transitiontemperature(Tc) duetoEu doping. AtleasttwoenergyscaleswereobservedfromthePESdataintheSCcompound:Oneat ∼14meVclosingaround Tc and thuscorrespondingtotheSCgap.Anotherenergyscaleappearsat ∼35 meVandsurvivesattemperaturesabove Tc which representsthepseudogap(PG).Thenon-SC sample (La,Eu)FeAsOshowsaPGat ∼ 41meV.Theseobservationsinthisnewsuperconductorare consistent withthegeneraltrendfollowedbyothercompoundsinthe “1111” family.