Coupled two-order-parameter approach to granular superconductors
G. Falci, R. Fazio, G. Giaquinta
DOI 10.1103/PhysRevB.39.8984 · Physical Review B
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Abstract
A two-order-parameter approach to the theory of granular superconductors is presented, in which the paracoherent transition and the superconductive one are treated accounting for their mutual coupling. The appearance of a tricritical line in the phase diagram is discussed. Renormalization of the amplitude of the order parameter is predicted in the whole temperature range, leading to a satisfactory understanding of experimental data previously unexplained.
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