Electronic Structure and Superconductivity of Nonmagnetic Transition Metal Borocarbides |
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| Authors: | S-L Drechsler H Rosner SV Shulga G Fuchs H von Lips J Freudenberger MS Golden M Knupfer K-H Müller L Schultz J Fink G Kaindl H Eschrig K Koepernik |
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| Affiliation: | (1) Institut für Festkörper- und Werkstofforschung Dresden, Postfach 270016, D-01171 Dresden, Germany;(2) Max Planck Institut für Chemie und Physik fester Stoffe, D-01187 Dresden, Germany;(3) Arnimallee 14, D-14195 Berlin, Germany |
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| Abstract: | The electronic structure of tetragonal (RC(N))m(TB)2, m=1–3, compounds, with R= Y,Lu,La, T=Ni,Pt is studied. Total and partial densities of states N(E) are calculated and compared with orbital resolved x-ray absorption data. Special attention is paid to the structure of N(E) near the Fermi-level and its consequences for thermodynamic properties in the superconducting and the normal states. A medium el-ph coupling constant 0.5  1.2 is found. There is no simple correlation between N(0) and T
c
. The analysis of the upper critical field reveals the presence of at least two groups of electrons with quite different Fermi velocities v
F
in accord with dHvA data, and with calculated distributions of v
F
around the Fermi surface |
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