Volume 35, Number 9, September III 1996
|Page(s)||707 - 712|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Non-uniform state in 2D superconductors
Centre de Physique Théorique et de Modélisation,
Université Bordeaux 1, CNRS-URA 1537 -
33174 Gradignan Cedex, France
2 Centre de Recherches sur les Très Basses Températures, laboratoire associé à l'Université Joseph Fourier, CNRS - BP 166, 38042 Grenoble cedex 9, France
Accepted: 29 July 1996
We have investigated for the first time the complete temperature dependence of the upper critical field Hc2 in 2D layered superconductors taking both the orbital and Pauli limits into account. It is demonstrated that in 2D superconductors the formation of the non-uniform Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase gives rise to an unusual temperature dependence of Hc2: for fields exactly parallel to the layers, Hc2 has a linear temperature dependence as ; for any other field orientation, provided that the initial slope of the critical field at is large, we predict at low temperature the appearance of a multiquanta vortex state, revealed by the oscillatory temperature dependence of . Such a new effect could be observed in low-Tc quasi-2D layered superconductors.
PACS: 74.60.Ec – Mixed state, critical fields, and surface sheath / 74.80.Dm – Superconducting layer structures: superlattices, heterojunctions, and multilayers
© EDP Sciences, 1996
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