- Tytuł:
- On the Crossover from BCS Superconductivity to Bose Condensation
- Autorzy:
- Micnas, R.
- Powiązania:
- https://bibliotekanauki.pl/articles/2030399.pdf
- Data publikacji:
- 2001-12
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
- 74.20.-z
- Opis:
- We outline a microscopic approach to the superconducting fluctuations and pairing correlations in the attractive Hubbard model above T$\text{}_{c}$, 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.
- Źródło:
-
Acta Physica Polonica A; 2001, 100, Supplement; 177-194
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki