Low-Temperature Magnetic Susceptibilities of Al2O3: V3+

Abstract

Previous measurements of the magnetic anisotropy of single-crystal ${\mathrm{Al}}_2$ ${\mathrm{O}}_3$: ${\mathrm{V}}^{3+}$ in the temperature range 1-5°K have already been used to obtain more accurate values for the zero-field splitting $\delta$ and for the perpendicular splitting factor $g_{\perp }$. The results of measurements by the Faraday method of ${\chi }_{\parallel }$ and ${\chi }_{\perp }$ are reported here along with some new anisotropy measurements. The results for all the parameters agree very well between the two experiments, and the values found are $\delta =8.06\mathrm{}\pm 0.15$ ${\mathrm{cm}}^{-1\mathrm{}}$, $g_{\perp }=1.720\mathrm{}\pm 0.003$, and the spin-orbit parameter $\lambda =91\mathrm{}\pm 1$ ${\mathrm{cm}}^{-1\mathrm{}}$.