Superconductivity in the pseudogap state in the hot-spot model: Ginzburg-Landau expansion |
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Authors: | É. Z. Kuchinskii M. V. Sadovskii N. A. Strigina |
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Affiliation: | (1) Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Yekaterinburg, 620016, Russia |
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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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