%0 Journal Article %T Temperature Dependence of the Critical Field of the Organic Superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br %+ Géosciences Environnement Toulouse (GET) %A Gasparov, V. A. %A Audouard, A. %A Drigo, L. %A Schlueter, J. A. %< avec comité de lecture %J JETP Letters %V 110 %P 74-78 %8 2019 %D 2019 %Z 2019JETPL.110...74G %R 10.1134/S0021364019130022 %Z Sciences of the Universe [physics]Journal articles %X 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 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. %G English %L insu-03661415 %U https://insu.hal.science/insu-03661415 %~ INSU %~ METEO %~ UNIV-TLSE3 %~ CNRS %~ CNES %~ OMP %~ OMP-LMTG %~ OMP-GET %~ UNIV-UT3 %~ UT3-INP %~ UT3-TOULOUSEINP