Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.39: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Surface and bulk electronic structure of Sr2RuO4 — •Volodymyr Zabolotnyy1, Emanuela Carleschi2, Timur Kim1, Alexander Kordyuk1, Jan Thöne1, Johen Geck1, Daniil Evtushinsky1, Bryan Doyle2, Rosalba Fittipaldi3, Mario Cuoco3, Antonio Vecchione3, Bernd Büchner1, and Sergey Borisenko1 — 1IFW - Dresden, Germany — 2University of Johannesburg, South Africa — 3CNR-INFM SuperMat Regional Laboratory, University of Salerno, Italy
Strontium ruthenates are famous for p-type superconductivity, metamagnetism, and notable spin-orbit coupling. Understanding all these phenomena requires a detailed knowledge of the electronic structure. Unfortunately recent ARPES on Sr2RuO4 was confronted with a problem of an acute ‘surface state’ (SS). Here we argue that, instead of the earlier proposed remedy of high temperature cleaving, one may rely on excitation energy dependence of matrix elements enhancing surface or bulk features, while circularly polarized light can be used to establish their origin. Owing to the minimized surface degradation we observe bulk α, β, γ bands and their surface counterparts along with additional δ feature. According to the dichroic pattern the new feature must be yet another surface counterpart of the β band. Also the narrower momentum width together with negligible kz dispersion are distinct properties specific to a surface state. Since there are numerous examples where the surface state undergoes splitting due to spin-orbit interaction we suggest that full relativistic calculation might be needed to understand the origin of the new feature.