Abstract
An expression is derived for the free energy of a superconductor near the critical temperature, taking account of the terms of next highest order in the parameter 1−T/T c. These terms become important for Ginzburg-Landau parameter values |κ−1|≪1, and in this case, in an external magnetic field H 0 close to H c2, the structure of the order parameter is determined by the relative values of the three small parameters |κ−1|, 1−T/T c, and (H c2−H 0)/H c2. Three types of lattices are investigated: triangular with one and two flux quanta per cell and square with one flux quantum per cell.
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Zh. Éksp. Teor. Fiz. 115, 726–739 (February 1999)
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Ovchinnikov, Y.N. Generalized Ginzburg-Landau equation and the properties of superconductors with Ginzburg-Landau parameter κ close to 1. J. Exp. Theor. Phys. 88, 398–405 (1999). https://doi.org/10.1134/1.558809
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DOI: https://doi.org/10.1134/1.558809