S. Gaona et Pr. Silva, MEAN-FIELD THEORY APPLIED TO THE HIGH-T-C SUPERCONDUCTIVITY, Physica status solidi. b, Basic research, 206(2), 1998, pp. 759-766
We propose an effective transverse Ising model (TIM) as a means to tre
at both metallic and high-temperature superconductivity. The model is
inspired by features which are present in the Gorter-Casimir two-fluid
model of superconductivity, but it encompasses also the formalism use
d to treat the phase transitions in hydrogen-bonded ferroelectrics. We
treat the model in the random-phase approximation, and as a consequen
ce, the superconducting state reveals a structure of a gas of elementa
ry excitations where the energy gap appears in a quite natural way.