On the Fulde-Ferrell State in Spatially Isotropic Superconductors

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Abstract

Effects of superconducting fluctuations on the Fulde-Ferrell (FF) state are discussed in a spatially isotropic three-dimensional superconductor under a magnetic field. For this system, Shimahara recently showed that within the phenomenological Ginzburg-Landau theory, the long-range order of the FF state is suppressed by the phase fluctuation of the superconducting order parameter [H. Shimahara: J. Phys. Soc. Jpn. 67 (1998) 1872; Physica B 259-261 (1999) 492]. In this letter, we investigate this instability of the FF state against superconducting fluctuations from the microscopic viewpoint, employing the theory developed by Nozières and Schmitt-Rink in the BCS-BEC crossover field. Besides the absence of the second-order phase transition associated with the FF state, we show that even if the pairing interaction is weak, the shift of the chemical potential from the Fermi energy due to the fluctuations is crucial near the critical magnetic field of the FF state obtained within the mean-field theory.

Original languageEnglish
Pages (from-to)2625-2628
Number of pages4
JournalJournal of the Physical Society of Japan
Volume71
Issue number11
DOIs
Publication statusPublished - 2002 Nov 1

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Keywords

  • Fulde-Ferrell state
  • Superconducting fluctuations
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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