Abstract
Superconductivity in the two-component model of coexisting local electron pairs (hard-core charged bosons) and itinerant fermions coupled via charge exchange mechanism is discussed. The cases of isotropic s-wave and anisotropic pairing of extended s-wave and \(d_{x^2 - y^2 } \) symmetries are analyzed for a 2D square lattice within the BCS-mean-field approximation (MFA) and the Kosterlitz–Thouless theory. The phase diagrams and superconducting characteristics of this induced pairing model as a function of the position of the local pair (LP) level and the total carrier concentration are reviewed. The model exhibits crossovers between the BCS-like behavior and that of LPs. In addition, the Uemura plots are obtained for extended s and \({\text{d}}_{x^2 - y^2 } \) pairing symmetries. Finally, we analyze the pairing fluctuation effects (in 3D) within a generalized T-matrix approach. Some of our results are discussed in connection with a two-component scenario of preformed pairs and unpaired electrons for high-temperature superconductors.
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Micnas, R., Robaszkiewicz, S. & Bussmann-Holder, A. Superconductivity in a Two-Component Model with Local Electron Pairs. Journal of Superconductivity 17, 27–32 (2004). https://doi.org/10.1023/B:JOSC.0000011835.35408.f3
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DOI: https://doi.org/10.1023/B:JOSC.0000011835.35408.f3