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

Abstract

The magnetic susceptibility of the organic superconductors $\kappa$-(h8 or d8-ET)${}_2$$X$, $X=$ Cu(NCS)${}_2$ and Cu[N(CN)${}_2$]Br has been studied. A metallic phase below $T^{\ast }=$ 37 $\sim$ 38 K for $X=$ Cu[N(CN)${}_2$]Br and 46 $\sim$ 50 K for $X=$ Cu(NCS)${}_2$ has an anisotropic temperature dependence of the susceptibility and the charge transport. Partial charge-density-wave or charge fluctuation is expected to coexist with the metallic phase instead of the large antiferromagnetic fluctuation above $T^{\ast }$. The phase diagram and the superconductivity of $\kappa$-(ET)${}_2$$X$ are discussed in connection with this phase.

5 pages, 4figures, REVTeX, references are corrected, accepted for pubication in Phys. Rev. B

References in corpus (2)

• Superconductivity mediated by charge fluctuations in layered molecular crystals
• Superconducting Gap Structure of kappa-(BEDT-TTF)2Cu(NCS)2 Probed by Thermal Conductivity Tensor

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