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Persistent URL
http://purl.org/net/epubs/work/40801
Record Status
Checked
Record Id
40801
Title
A semiphenomenological approach for description of quasiparticles in high temperature superconductors
Contributors
Z Szotek
,
BL Gyorffy
,
WM Temmerman
,
OK Andersen
,
O Jepsen
Abstract
We present a semiphenomenological approach to calculating the quasiparticle spectra of High Temperature Superconductors (HTSC’s). It is based on a particularly efficient parametrization of the effective electron-electron interaction afforded by the Density Functional Theory for superconductors and a Tight-Binding Linearized-Mumn-Tin-Orbital scheme for solving the corresponding Kohn-Sham-Bogoliubov-de Gennes equations. We illustrate the method by investigating a number of site and orbital specific, but otherwise phenomenological models of pairing in quantitative detail. We compare our results for the anisotropy of the gap function on the Fermi surface with those deduced from photoemission experiments on single crystals of YBa2Cu3O7. We also compare our predictions for the low temperature dependence of the specific heat with measurements. We investigate the doping dependence of the superconducting transition temperature, Tc. We present new evidence that the Van Hove-like scenario is an essential feature of superconductivity in these materials. Since our description of pairing is semiphenomenological, we shed new light on the physical mechanism of pairing only indirectly and conclude, provisionally, that the dominant pairing interaction operates between electrons of opposite spin, on nearest neighbour Cu sites in d x2-y2 orbitals.
Organisation
CCLRC
,
CSE
,
CSE-BTG
Keywords
Funding Information
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Language
English (EN)
Type
Details
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Year
Book Chapter or Section
In New Developments in High Temperature Superconductivity. Edited by J Klamut, BW Veal, BM Dabrowski, PW Klamut, M Kazimierski, 123-156. Springer, 2000.
https://doi.org/10.1007/3-540-46511-1_9
2000
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