Suppression of Nonmagnetic Insulating State by Application of Pressure in Mineral Tetrahedrite Cu${}_{12}$Sb${}_4$S${}_{13}$

Abstract

The mineral tetrahedrite Cu${}_{12}$Sb${}_4$S${}_{13}$ exhibits a first-order metal--insulator transition (MIT) at $T_{\mathrm{MI}}$ = 85 K and ambient pressure. We measured the ${}^{63}$Cu-NMR at ambient pressure and the resistivity and magnetic susceptibility at high pressures. ${}^{63}$Cu-NMR results indicate a nonmagnetic insulating ground state in this compound. The MIT is monotonically suppressed by pressure and disappears at $\sim 1.0$ GPa. Two other anomalies are observed in the resistivity measurements, and the pressure -- temperature phase diagram of Cu${}_{12}$Sb${}_4$S${}_{13}$ is constructed.

5 pages, 7 figures

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