Knight Shift and Zero-Field Splitting in Rhenium Determined by Nuclear Acoustic Resonance

Abstract

Nuclear acoustic resonance signals have been observed in a single crystal of rhenium metal. From measurements of the resonance fields at different frequencies, values for the Knight shift and zero-field splitting at 4.2\ifmmode^\circ\else\textdegree\fi{}K are obtained. The Knight shift, referred to aqueous NaRe${\mathrm{O}}_{4}$, is found to be (1.02 \ifmmode\pm\else\textpm\fi{} 0.06)%. The zero-field splitting, $\frac{3{e}^{2}\mathrm{qQ}}{20h}$, is found to be 40.6 \ifmmode\pm\else\textpm\fi{} 0.35 MHz for ${\mathrm{Re}}^{185}$ and 38.35 \ifmmode\pm\else\textpm\fi{} 0.2 MHz for ${\mathrm{Re}}^{187}$.