Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 16: Neue und unkonventionelle Supraleiter II

TT 16.4: Talk

Wednesday, March 13, 2002, 15:15–15:30, H18

Evidence for a conventional electronic structure of MgB₂ from the theoretical description of ARPES data — •Vito Servedio¹, Stefan-Ludwig Drechsler², Todor Mishonov³, and Helge Rosner⁴ — ¹Institut für Oberflächen- und Mikrostrukturphysik,TU Dresden, D-01062 Dresden — ²Institut für Festkörper- und Werkstofforschung Dresden — ³Katholieke Universiteit, Leuven, Belgium and University of Sofia, Bulgaria — ⁴Department of Physics, University of California, Davis, USA

We report layer-Korringa-Kohn-Rostocker calculations within the local density approximation for bulk and surface states (SFS) as well as the corresponding angle resolved photoemission spectroscopy (ARPES) intensities of MgB₂. Since our theoretical results reproduce very well recent ARPES data [1], we conclude that the electronic structure of MgB₂ is a conventional one. At least two SFS are assigned. The electron-phonon interaction for these states is estimated and compared with that in the bulk. Consequences of SFS on the superconducting properties of small grains in micro-powder samples are discussed.

[1]H. Uchiyama et al, cond-mat/0111152.