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Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductor κ(BEDTTTF)2Cu(NCS)2

R. Lortz, Y. Wang, A. Demuer, P. H. M. Böttger, B. Bergk, G. Zwicknagl, Y. Nakazawa, and J. Wosnitza
Phys. Rev. Lett. 99, 187002 – Published 30 October 2007

Abstract

The specific heat of the layered organic superconductor κ(BEDTTTF)2Cu(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.

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  • Received 25 June 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.187002

©2007 American Physical Society

Authors & Affiliations

R. Lortz1, Y. Wang2, A. Demuer2, P. H. M. Böttger3, B. Bergk3, G. Zwicknagl4, Y. Nakazawa5, and J. Wosnitza3

  • 1Department of Condensed Matter Physics, University of Geneva, CH-1211 Geneva 4, Switzerland
  • 2Grenoble High Magnetic Field Laboratory, CNRS, 38042 Grenoble Cedex 9, France
  • 3Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden-Rossendorf, D-01314 Dresden, Germany
  • 4Institut für Mathematische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany
  • 5Department of Chemistry, Osaka University, 1-1, Machikaneyama, Toyonaka, Osaka, Japan

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Issue

Vol. 99, Iss. 18 — 2 November 2007

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