J. Phys. IV France
Volume 114, April 2004
Page(s) 239 - 243

J. Phys. IV France
114 (2004) 239
DOI: 10.1051/jp4:2004114051

Pinning of vortices in the $\kappa$-(BEDT-TTF) 2X organic superconductors

C. Pasquier1, 1, N. Joo1, 2, P. Batail3, D. Schweitzer4 and D. Jérome1

1  Laboratoire de Physique des Solides, Bât. 510, Centre Universitaire, 91405 Orsay Cedex, France
2  LPMC, Faculté des Sciences de Tunis, Campus Universitaire, 1060 Tunis, Tunisie
3  CIMI, FRE 2447 CNRS-Université d'Angers, UFR Sciences, 2 Bd. Lavoisier, 49045 Angers, France
4  Physikaliches Institut, Universität Stuttgart, 70550 Stuttgart, Germany

The pinning properties of vortices of four different compounds of the $\kappa$-(BEDT-TTF) 2X family are presented. From the characteristic energies for pinning, we establish scaling laws for the evolution of the penetration depth and the anisotropy with respect to chemical pressure. These quantities are then deduced as unpinning in the liquid phase is attributed to disentanglement of the flux lines. Key words. superconductivity - vortices - pinning.

© EDP Sciences 2004