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Pseudogap-state superconductivity in a “hot-point” model: Gor’kov equations

  • Metals and Superconductors
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Abstract

The specific features of the superconducting state (with s and d pairing) are considered in terms of a pseudogap state caused by short-range order fluctuations of the “dielectric” type, namely, antiferromagnetic (spin density wave) or charge density wave fluctuations, in a model of the Fermi surface with “hot points.” A set of recurrent Gor’kov equations is derived with inclusion of all Feynman diagrams of a perturbation expansion in the interaction between an electron and short-range order fluctuations causing strong scattering near hot points. The influence of nonmagnetic impurities on superconductivity in such a pseudogap state is analyzed. The critical temperature for the superconducting transition is determined, and the effect of the effective pseudogap width, correlation length of short-range-order fluctuations, and impurity scattering frequency on the temperature dependence of the energy gap is investigated.

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Authors and Affiliations

  1. Institute of Electrophysics, Ural Division, Russian Academy of Sciences, ul. Komsomol’skaya 34, Yekaterinburg, 620016, Russia

    N. A. Kuleeva & É. Z. Kuchinskii

Authors
  1. N. A. Kuleeva
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  2. É. Z. Kuchinskii
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__________

Translated from Fizika Tverdogo Tela, Vol. 46, No. 9, 2004, pp. 1557–1565.

Original Russian Text Copyright © 2004 by Kuleeva, Kuchinski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\).

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Kuleeva, N.A., Kuchinskii, É.Z. Pseudogap-state superconductivity in a “hot-point” model: Gor’kov equations. Phys. Solid State 46, 1604–1612 (2004). https://doi.org/10.1134/1.1799173

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  • DOI: https://doi.org/10.1134/1.1799173

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