title: New superconducting phases in field-induced organic superconductor lambda-(BETS)2FeCl4.
abstract: We derive the parallel upper critical field, Hc2, as a function of the temperature T in quasi-2D organic compound lambda-(BETS)2FeCl4, accounting for the formation of the nonuniform Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) state. To further check the 2D LOFF model, we propose to study the Hc2(T) curve at low T in tilted fields, where the vortex state is described by the high Landau level functions characterized by the index n. We predict a cascade of first-order transitions between vortex phases with different n, between phases with different types of the symmetry at given n and the change of the superconducting transition from the second order to the first order as FeCl4 ions are replaced partly by GaCl4 ions.
authors.affiliation: CPMOH, Université Bordeaux 1, F-33405 Talence Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Houzet
authors.forename: A
authors.initials: A
authors.lastname: Buzdin
authors.forename: L
authors.initials: L
authors.lastname: Bulaevskii
authors.forename: M
authors.initials: M
authors.lastname: Maley