Magnetic and Electronic Phase Diagram and Superconductivity in the Organic Superconductors k-(BEDT-TTF)2X

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The magnetic susceptibility of the organic superconductors κ-(h8 or d8-ET)₂X, X = Cu(NCS)₂ and Cu[N(CN)₂]Br has been studied. A metallic phase below T* = 37 38 K for X = Cu[N(CN)₂]Br and 46 50 K for X = Cu(NCS)₂ has an anisotropic temperature dependence of the susceptibility and the charge transport. Partial charge-density-wave or charge fluctuation is expected to coexist with the metallic phase instead of the large antiferromagnetic fluctuation above T*. The phase diagram and the superconductivity of κ-(ET)₂X are discussed in connection with this phase.