Superconductivity in a two-component model with local electron pairs

Micnas, R.; Robaszkiewicz, S.; Bussmann-Holder, A.

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Superconductivity in a two-component model with local electron pairs

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Bussmann-Holder, A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Department Electronic Structure Theory (Ali Alavi), Max Planck Institute for Solid State Research, Max Planck Society;

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Micnas, R., Robaszkiewicz, S., & Bussmann-Holder, A. (2004). Superconductivity in a two-component model with local electron pairs. Journal of Superconductivity, 17(1), 27-32.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F865-9

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(x2-y2) 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 d(x2-y2)
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.