S33Nuclear Magnetic Resonance in Paramagneticα-MnS

The temperature dependence of the ${\mathrm{S}}^{33}$ nuclear magnetic resonance has been studied in the paramagnetic state of the cubic antiferromagnet $\alpha$-MnS. In the temperature range of 175 to 300°K, a Curie-Weiss temperature of —630°K and a transferred hyperfine coupling constant $A^{33}$ of +(1.65±0.04)×${10}^{-4\mathrm{}}$ ${\mathrm{cm}}^{-1\mathrm{}}$ are measured. Utilizing the ${\mathrm{Mn}}^{55}$ nuclear-magnetic-resonance data measured by Jones, the ratio of $A^{33}$ to $A^{55}$, the ${\mathrm{Mn}}^{55}$ hyperfine coupling constant, is determined to be $\frac{A^{33}}{A^{55}}=-0.0230\mathrm{}\pm 0.0005$. A discussion is presented on the effective fraction of valence electrons which contribute to the hyperfine field.