Abstract

Abstract ESCA, ESR, and thermopower were measured in crystals of an organic superconductor, (BEDT-TTF)2Cu(NCS)2 (Tc=10.4 K), to examine a valence state of Cu and a transport property. The Cu state was confirmed at 298 K by ESCA. ESR indicates a broad Lorentzian signal of a BEDT-TTF cation radical and no Cu signal at 298–4 K. The thermopower is anisotropic in the two-dimensional bc plane, which is originated from the anisotropy of the band structure.

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