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- Title
Temperature Dependence of the Critical Field of the Organic Superconductor κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br.
- Authors
Gasparov, V. A.; Audouard, A.; Drigo, L.; Schlueter, J. A.
- Abstract
We present upper critical magnetic fields data for κ(BEDT-TTF)2Cu[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 ∥ b) and in-plane (H ∥ 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 Hc2(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 Tc, followed by saturation at lower temperatures. Possibly, this upturn is an indication of flux-line lattice melting.
- Subjects
ORGANIC superconductors; MAGNETIC field measurements; CRITICAL temperature; FLUX-line lattice; MAGNETIC crystals
- Publication
JETP Letters, 2019, Vol 110, Issue 13, p74
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364019130022