Magnetic torque of κ-(BEDT-TTF)2Cu(NCS)2 single crystals

S. Kawamata, K. Okuda, T. Sasaki, N. Toyota

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The magnetic torque of κ-(BEDT-TFF)2Cu(NCS)2 was measured as a function of field direction θ with respect to the a*-axis under constant magnetic fields, H, up to 8 kOe in the temperature range from 1.3 to 8 K. A sharp cusp, C1, in the irreversible region was found at θc1 near the H∥bc-plane between 1.3 and 7 K. In addition, extra cusps, C2 and C3, were observed at θc2 and θc3, respectively, between 2.5 and 6 K. At each temperature, the perpendicular component of H giving each cusp is kept constant as {Mathematical expression} i.e., cusps C1, C2, and C3 are ruled by the characteristic field perpendicular to the bc-plane Hcp1, Hcp2, and Hcp3, respectively. These behaviors are almost the same as those we found in the oxide superconductor Bi2Sr2CaCu2O8. These results suggest that the cusps are intrinsic for irreversible vortex states of these layered superconductors.

Original languageEnglish
Pages (from-to)675-677
Number of pages3
JournalJournal of Superconductivity
Issue number3
Publication statusPublished - 1994 Jun


  • κ-(BEDT-TTF)Cu(NCS)
  • anisotropic superconductor
  • flux pinning
  • lower critical field H;κ-(BEDT-TTF)Cu(NCS)
  • Organic superconductor


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