Superconducting Characteristics of the Penson-Kolb Model
W.R. Czart and S. Robaszkiewicz
Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 PoznaƄ
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We study superconducting properties of the Penson-Kolb model, i.e. the tight-binding model with the pair-hopping (intersite 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.
DOI: 10.12693/APhysPolA.97.217
PACS numbers: 74.20.-z, 71.28.+d, 74.25.Ha