Superconducting fluctuations near the FFLO phase
BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
< Reduce
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
Language
en
Communication dans un congrès
This item was published in
2008-08-06, Amsterdam. 2009-03-30, vol. 150, n° 5, p. 052121 (1-4)
IOP Publishing
English Abstract
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 ...Read more >
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.Read less <
ANR Project
Extreme Conditions Correlated Electrons
Origin
Hal imported