Volume 60, Number 1, October 2002
|Page(s)||134 - 140|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Anisotropic s-wave superconductivity: Comparison with experiments on single crystals
Laboratorium voor Vaste-Stoffusica en Magnetisme, Katholieke Universiteit Leuven
B-3001 Leuven, Belgium
2 Max-Planck-Institute for the Chemical Physics of Solids Nöthnitzer Str. 40, D-01187 Dresden, Germany
3 Universität Tübingen, Institut für Theoretische Physik Auf der Morgenstelle 14, 72076 Tübingen, Germany
4 Max-Planck-Institute for Physics of Complex Systems Nöthnitzer Str. 38, D-01187 Dresden, Germany
5 Department of Physics and Astronomy, University of Southern California Los Angeles, CA 90089-0484, USA
Accepted: 9 July 2002
The recently discovered superconductivity in MgB2 has captured world attention due to its simple crystal structure and relatively high superconducting transition temperature . It appears to be generally accepted that it is phonon-mediated s-wave BCS-like superconductivity. Surprisingly, the strongly temperature-dependent anisotropy of the upper critical field, observed experimentally in magnesium diboride single crystals, is still lacking a consistent theoretical explanation. We propose a simple single-gap anisotropic s-wave order parameter in order to compare its implications with the predictions of a multi-gap isotropic s-wave model. The quasiparticle density of states, thermodynamic properties, NMR spin-lattice relaxation rate, optical conductivity, and Hc2 anisotropy have been analyzed within this anisotropic s-wave model. We show that the present model can capture many aspects of the unusual superconducting properties of the MgB2 compound, though more experimental data appear to be necessary from single-crystal MgB2.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.25.Bt – Thermodynamic properties / 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.)
© EDP Sciences, 2002
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