Volume 79, Number 6, September 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 August 2007|
Anomalous fluctuation regimes at FFLO transition
Universités de Bordeaux, CPMOH, CNRS - 33405, Talence Cedex, France
2 Institut Universitaire de France - 75005, Paris, France
Corresponding author: firstname.lastname@example.org
Accepted: 23 July 2007
Recently some experimental evidences have been obtained in favour of the existence of the inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state. However the unambiguous identification of FFLO state remains very difficult. Since the region of the critical fluctuations is extremely narrow in superconductors, we investigate theoretically the Gaussian fluctuations near the FFLO transition and demonstrate that the behaviors of the fluctuational specific heat and paraconductivity in the normal state are qualitatively different from the usual superconducting transition. Special values of the critical exponents and the crossovers between different fluctuational regimes may provide a unique test for the FFLO state appearance.
PACS: 74.81.-g – Inhomogeneous superconductors and superconducting systems / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 03.75.Mn – Multicomponent condensates; spinor condensates
© Europhysics Letters Association, 2007
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