Physics – Condensed Matter – Superconductivity
Scientific paper
2007-06-25
Phys. Rev. Lett. 99, 187002 (2007)
Physics
Condensed Matter
Superconductivity
4pages, 3 figures
Scientific paper
10.1103/PhysRevLett.99.187002
The specific heat of the layered organic superconductor $\kappa$-% (BEDT-TTF)$_2$Cu(NCS)$_2$, where BEDT-TTF is bisethylenedithio-% tetrathiafulvalene, has been studied in magnetic fields up to 28 T applied perpendicular and parallel to the superconducting layers. In parallel fields above 21 T, the superconducting transition becomes first order, which signals that the Pauli-limiting field is reached. Instead of saturating at this field value, the upper critical field increases sharply and a second first-order transition line appears within the superconducting phase. Our results give strong evidence that the phase, which separates the homogeneous superconducting state from the normal state is a realization of a Fulde-Ferrell-Larkin-Ovchinnikov state.
Bergk B.
Böttger P. H. M.
Demuer A.
Lortz Rolf
Nakazawa Yasuhiro
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