Study of superconducting fluctuations in superconductors with strong fluctuations

T. Koyama, M. Tachiki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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 languageEnglish
Pages (from-to)91-103
Number of pages13
JournalPhysica C: Superconductivity and its applications
Volume221
Issue number1-2
DOIs
Publication statusPublished - 1994 Feb 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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