Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 23: Posters Superconductivity, Solids at Low Temperature

TT 23.30: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU D

Electronic structure and weak electron-phonon coupling in TiB₂ — •Eugenio Forzani¹ and Helge Rosner² — ¹I. Physikalisches Institut, Universität Göttingen — ²MPI for Chemical Physics of Solids, Dresden

The Fermi surface of TiB₂ was studied with the de Haas-van Alphen (dHvA) effect in order to clarify the electronic analogies with the previously investigated ZrB₂ [1]. This effort intends to revise a past work [2], which accused sample limitations, and to extend the investigation of the transition metal diborides of the fourth group. For a definite assignment of all the dHvA frequencies the angular dependencies of the extremal cross-section areas are estimated from full-potential band structure calculations [3]. In order to explain the absence of conventional superconductivity also in this diboride compound, the electron-phonon coupling constants are deduced from the experimental and theoretical datas. Developments of the measurement technique and new goals are discussed.

[1] S.L. Drechsler et al., J. of Low Temp. Phys. 131, 5/6 (2003)

[2] T. Tanaka and Y. Ishizawa, J. Phys. C: Solid St. Phys. 13, 6671-6 (1980)

[3] H. Rosner et al., Phys. Rev. B66, 024521 (2002) ^*With grant of the Göttingen Graduate School of Physics