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Superconductivity in the pseudogap state in the hot-spot model: Ginzburg-Landau expansion

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Abstract

Peculiarities of the superconducting state (s and d pairing) are considered in the model of the pseudogap state induced by short-range order fluctuations of the dielectric (AFM (SDW) or CDW) type, which is based on the model of the Fermi surface with “hot spots.” A microscopic derivation of the Ginzburg-Landau expansion is given with allowance for all Feynman diagrams in perturbation theory in the electron interaction with short-range order fluctuations responsible for strong scattering in the vicinity of hot spots. The superconducting transition temperature is determined as a function of the effective pseudogap width and the correlation length of short-range order fluctuations. Similar dependences are derived for the main parameters of a superconductor in the vicinity of the superconducting transition temperature. It is shown, in particular, that the specific heat jump at the transition point is considerably suppressed upon a transition to the pseudogap region on the phase diagram.

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Authors and Affiliations

  1. Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Yekaterinburg, 620016, Russia

    É. Z. Kuchinskii, M. V. Sadovskii & N. A. Strigina

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  1. É. Z. Kuchinskii
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  2. M. V. Sadovskii
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  3. N. A. Strigina
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__________

Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 125, No. 4, 2004, pp. 854–867.

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

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Kuchinskii, É.Z., Sadovskii, M.V. & Strigina, N.A. Superconductivity in the pseudogap state in the hot-spot model: Ginzburg-Landau expansion. J. Exp. Theor. Phys. 98, 748–759 (2004). https://doi.org/10.1134/1.1757675

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  • DOI: https://doi.org/10.1134/1.1757675

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