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Europhysics Letters (EPL)

Optimal Superconducting Critical Temperature in the Two-Dimensional Attractive Hubbard Model

P. J. H. Denteneer, Guozhong An, J. M. J. van Leeuwen

Published Oct 1, 1991• 3 citations
Publisher

Abstract

Erratum for Europhys. Lett. 16 (1) 5-10 (1991)
DOI
10.1209/0295-5075/16/5/017

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The critical temperature for superconductivity for the two-dimensional attractive (negative- U ) Hubbard model on a square lattice is calculated as a function of the strength of the interaction and of the density of electrons. The critical temperature is obtained by calculating the helicity modulus associated with a wavelike distortion of the gap parameter in the BCS approximation as a function of temperature and subsequent comparison with the Kosterlitz-Thouless relation between critical temperature and helicity modulus. The adequacy of the approximations is discussed and a comparison with recent Monte Carlo calculations is made.