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2001 | 100 | Supplement | 177-194
Article title

On the Crossover from BCS Superconductivity to Bose Condensation

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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.
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EN
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Year
Volume
100
Issue
Pages
177-194
Physical description
Dates
published
2001-12
received
2001-12-17
Contributors
author
  • Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
References
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Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv100n710kz
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