Volume 80, Number 6, December 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 November 2007|
FFLO state in thin superconducting films
Institut Universitaire de France and Université Bordeaux I, CPMOH, UMR 5798 - 33405 Talence, France
2 Department of Physics, Kyoto University - Sakyo-ku, Kyoto 606-8502, Japan
3 Institute for Solid State Physics, University of Tokyo - Kashiwa, Chiba 277-8581, Japan
Accepted: 17 October 2007
We present the analysis of the inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state in thin superconducting films in the parallel magnetic field. For the tetragonal crystal symmetry (relevant to CeCoIn5 —the most probable candidate for the FFLO state formation) we predict a very peculiar in-plane angular dependence of the FFLO critical field due to the orbital effect. In the uniform superconducting state the critical field should be isotropic. The magnetic field pins also the direction of the FFLO modulation permitting thus to study the critical-current anisotropy. Our calculations reveal a strong critical-current anisotropy in the FFLO state in sharp contrast with the usual superconducting state. The predicted characteristic anisotropies of the critical field and critical current may provide an unambiguous probe of the FFLO phase formation.
PACS: 74.45.+c – Proximity effects; Andreev effect; SN and SNS junctions / 74.78.Fk – Multilayers, superlattices, heterostructures / 74.81.-g – Inhomogeneous superconductors and superconducting systems
© Europhysics Letters Association, 2007
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