Abstract

The κ-(BEDT-TTF) 2X family are quite attractive in the study of metal-insulator transitions and competition between superconductivity and magnetic ordering. We report 13C-NMR study of X= Cu[N(CN) 2]Cl salt and discuss on the electronic structure, compared with the results of superconducting salts. In addition, we found that the deuterated Cu[N(CN) 2]Br salt, when cooled rapidly, showes AF ordering like the Cu[N(CN) 2]Cl salt with only minor fraction of superconducting phase. We also report 13C-NMR study of this salt.

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