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Thermodynamics of Superconductors with Charge‐ and Spin‐Density Waves
Author(s) -
Gabovich A. M.,
Gerber A. S.,
Shpigel A. S.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221410225
Subject(s) - condensed matter physics , superconductivity , fermi surface , physics , charge (physics) , bcs theory , spin (aerodynamics) , charge density , spin density wave , density of states , thermodynamics , quantum mechanics , pairing
Using thermal Green's function technique the thermodynamics of superconductors with charge‐ and spin‐density waves is considered. The Δ/ T c ratio and the paramagnetic limit H p are calculated for various values of the dielectric gap σ and the parameter ν = N nd (0)/ N d (0), where N nd (0) and N d (0) are the electron densities of states for non‐dielectrized and dielectrized Fermi surface sections, Δ(0) is the zero‐temperature value of the superconducting order parameters, and T c is the critical temperature. It is shown that for the charge‐density wave‐superconductors the values Δ(0)/ T c are substantially less than in the conventional BCS theory. The theoretical conclusions are in a good agreement with the experiment.