Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Superconductivity - Poster Session
TT 8.19: Poster
Montag, 26. März 2007, 14:00–17:45, Poster A
Determination of the band structure of LuNi2B2C — •Beate Bergk1,2, Marek Bartkowiak1, Oleg Ignatchik1, Manfred Jäckel2, Joachim Wosnitza3, Helge Rosner3, Vivien Petzold3, and Paul Canfield4 — 1Hochfeld-Magnetlabor Dresden, Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany — 2Institut für Festkörperphysik, TU-Dresden, D-01062 Dresden, Germany — 3MPI für chemische Physik fester Stoffe, D-01187 Dresden, Germany — 4Condensed Matter Physics, Ames Laboratory, Ames, Iowa 50011,
We present de Haas-van Alphen (dHvA) investigations on the nonmagnetic borocarbide superconductor LuNi2B2C which have been performed by use of the torque method in high magnetic fields up to 32 T and at low temperatures down to 50 mK. The complex band structure is extracted from the quantum oscillations in the normal state. In comparison with full-potential-local-orbital calculations of the band structure we are able to assign the observed dHvA frequencies to the different bands. Temperature dependent dHvA investigations allowed the extraction of the effective band masses for the several Fermi-surface sheets. We observe an enhancement of the effective masses compared to the theoretical calculations which is due to electron-phonon interaction. Finally, we are able to examine the angular dependence of the electron-phonon coupling for the different Fermi-surface sheets.