Abstract
The effect of superconducting fluctuations is studied in an approximation beyond the Hartree-Fock approximation for the one-particle Green function and the random-phase approximation for the propagator of the superconducting fluctuations (HF-RPA) in the clean limit. The pair susceptibility is obtained in a form consistent with the self-energy correction in the sense that the phase invariance of the system is not violated. This is done by the systematic use of the Ward-Takahashi relations derived from the phase invariance. Superconducting fluctuations greatly reduce the transition temperature from the mean-field value in a superconductor with a small Fermi energy and a large BCS coupling constant.
Original language | English |
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Pages (from-to) | 91-103 |
Number of pages | 13 |
Journal | Physica C: Superconductivity and its applications |
Volume | 221 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 1994 Feb 20 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering