Temperature Dependence of the Critical Field of the Organic Superconductor {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br.

Gasparov, V. A.; Audouard, A.; Drigo, L.; Schleuter, J. A.

doi:10.1134/S0021364019130022

Temperature Dependence of the Critical Field of the Organic Superconductor {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br.

Journal Article · Mon Jul 01 04:00:00 EDT 2019 · JETP Letters

DOI:https://doi.org/10.1134/S0021364019130022· OSTI ID:1572454

Gasparov, V. A.; Audouard, A.; Drigo, L.; Schleuter, J. A.

We present upper critical magnetic fields data for kappa(BEDT-TTF)(2)Cu[N(CN)(2)]Br (hereafter k-Br), single crystals with the magnetic field applied either or perpendicular and parallel to the conducting layers. The H-T phase diagram in these single crystals has been deduced from tunnel diode oscillator-based contactless measurements in pulsed magnetic fields up to 56 T for the inter-plane (H parallel to b) and in-plane (H parallel to ac) field directions. Temperature dependence of the magnetic penetration depth in DC fields is also reported. The temperature dependence of the upper critical magnetic field H-c2(T) is not accounted for the Werthamer-Helfand-Hohenberg model for in-plane configuration. For the inter-plane orientation, a significant upward curvature is observed as the temperature decreases, in the range close to T-c, followed by saturation at lower temperatures. Possibly, this upturn is an indication of flux-line lattice melting.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: Russian Foundation for Basic Research; Russian Academy of Sciences; European Magnetic Field Laboratory (EMFL)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1572454

Journal Information:: JETP Letters, Journal Name: JETP Letters Journal Issue: 1 Vol. 110; ISSN 0021-3640

Country of Publication:: United States

Language:: English

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