On the Crossover from BCS Superconductivity to Bose Condensation

• Authors: R. Micnas
• Languages of publication: EN

Abstracts

EN

We outline a microscopic approach to the superconducting fluctuations and pairing correlations in the attractive Hubbard model above T_c, using the functional integral method. A crossover from BCS superconductivity to Bose condensation of preformed pairs is studied by constructing the appropriate Ginzburg-Landau functionals. The differences between the lattice and the continuum models are discussed. The case of quasi-two-dimensional superconductors as well as the model with non-local pairing interaction are also examined. The effects of Gaussian fluctuations of the order parameter are analyzed in the T-matrix approach, the self-consistent Hartree approach and finally within the Ginzburg-Landau theory. Similarities with a paramagnon theory of itinerant-electron magnetism are pointed out.

Keywords

EN

74.20.-z

Discipline

• 74.20.-z: Theories and models of superconducting state

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 100
• Issue: Supplement
• Pages: 177-194

Dates

published

2001-12

received

2001-12-17

Contributors

author

R. Micnas

• Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.100.177