Pairing, condensation, and superconductivity described by a Hubbard model with an attractive interaction
B. L. Gyorffy, J. B. Staunton, G. M. Stocks
DOI 10.1103/PhysRevB.44.5190 · Physical Review B
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Abstract
We have developed a method for studying superconductivity in the negative-U Hubbard model. It is based on the Hubbard-alloy-analogy approximation applied to the Gor’kov equation for the model. We find that, unlike the case of the BCS solution, the formation of pairs and their condensation into a superconducting ground state take place at two different temperatures. We calculate the condensation temperature Tc for all U and discuss the nature of the normal state which, for large enough U, features a macroscopically large number of pairs. Briefly, we argue that the model has relevance for high-temperature superconductors.
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