Abstract
Magnetic torque of a quasi two-dimensional superconductor κ-(BEDT-TTF) 2Cu(NCS) 2 was measured as a function of field direction θ with respect to the a ∗-axis under several magnetic fields H up to 8 kOe in the temperature range from 1.3 to 8 K. A sharp cusp C 1 in the irreversible vortex region was found at θ c1 near H∥ bc-plane between 1.3 and 7 K. In addition, extra cusps C 2 and C 3 were also observed at θ c2 and θ c3 , respectively, between 2.5 and 6 K. At each temperature, the perpendicular component of H to give each cusp is kept constant as: H cos θ cn const. H c Pn ( n = 1, 2, 3), i.e., cusps C 1, C 2 and C 3 are ruled by the characteristic field perpendicular to the bc-plane H c P1 , H c P2 and H c P3 , respectively. These behaviors are almost the same as those we reported previously on the oxide superconductor Bi 2Sr 2CaCu 2O 8 (Bi2212). The results reveal that the cusp effect is intrinsic for these layered superconductors.
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