KONSCHELLE, François; CAYSSOL, Jérôme; BUZDIN, Alexandre I.

doi:10.1088/1742-6596/150/5/052121

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KONSCHELLE, François
Centre de physique moléculaire optique et hertzienne [CPMOH]

CAYSSOL, Jérôme
Centre de physique moléculaire optique et hertzienne [CPMOH]

BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]

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Communication dans un congrès

Ce document a été publié dans

2008-08-06, Amsterdam. 2009-03-30, vol. 150, n° 5, p. 052121 (1-4)

IOP Publishing

Résumé en anglais

The Fulde, Ferrell, Larkin & Ovchinnikov (FFLO) state consists in a modulation of the superconducting order parameter due to Zeeman effect. In a Ginzburg-Landau approach, higher order term than usual in the gradient expansion, i.e. quartic terms, are needed to take into account the FFLO modulation. The role of this quartic term in addition to the quadratic usual term in a Gaussian fluctuation spectrum has been investigated for heat capacity $C$ and paraconductivity $\sigma$ near a FFLO state for both isotropic and anisotropic cases. In the isotropic (resp. anisotropic) case, the power laws are drastically different (resp. similar) in comparison with the homogeneous superconductivity case. Nevertheless, for the anisotropic case the anisotropic ratio $\sigma_{xx}/\sigma_{yy}$ is quite different for a FFLO phase than for a BCS one. In addition, we predict anomalous power laws near the tricritical point where the normal phase and the two superconducting (uniform and FFLO) phases are merging. The multiple crossovers associated with the phase transitions between homogeneous, tricritical and inhomogeneous fluctuation regimes thus may serve as a powerful tool to identify the FFLO phases.< Réduire

DOI

http://dx.doi.org/10.1088/1742-6596/150/5/052121

Project ANR

Extreme Conditions Correlated Electrons

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798