Anomalous Magnetic Properties of MetallicV2O3under Pressure

Abstract

The ${}^{51}$V NMR shift and the spin-lattice relaxation rate $\left({1/T}_1\right)$ have been measured in the metallic paramagnetic state of a ${\mathrm{V}}_2$ ${\mathrm{O}}_3$ powder sample under pressure. The spin susceptibility deduced from the shift data has a maximum at $T=40\mathrm{}\mathrm{K}$. Also, a peak was observed in ${1/T}_{1}T$ at $T=8\mathrm{}\mathrm{K}$. These phenomena resemble the spin-gap behavior observed in lightly doped cuprate superconductors. The anisotropy of the shift and ${1/T}_1$ measured on a single crystal at ambient pressure suggests, however, that nuclear relaxation at high temperatures is mostly due to orbital moments.