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A Semiphenomenological Approach for Description of Quasiparticles in High Temperature Superconductors

  • Z. Szotek
  • B. L. Gyorffy
  • W. M. Temmerman
  • O. K. Andersen
  • O. Jepsen
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 545)

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.

Keywords

Fermi Surface Local Density Approximation Quasiparticle Spectrum Local Density Approximation Calculation Pairing Amplitude 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Z. Szotek
    • 1
  • B. L. Gyorffy
    • 2
  • W. M. Temmerman
    • 1
  • O. K. Andersen
    • 3
  • O. Jepsen
    • 3
  1. 1.Daresbury LaboratoryWarringtonEngland, UK
  2. 2.H H Wills Physics LaboratoryUniversity of BristolBristolEngland, UK
  3. 3.Max-Planck-Institut für FestkörperforschungStuttgartGermany

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