Abstract
We study superconducting properties of the Penson—Kolb model, i.e. the tight-binding model with the pair-hopping ( inters ite charge exchange) interaction J. The evolution of the critical fields, the coherence length, the Ginzburg ratio, and the London penetration depth with particle concentration n and pairing strength are determined. The results are compared with those found earlier for the attractive Hubbard model.
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