Quadrupole exchange contributions to theTa181nuclear acoustic resonance line shapes in pure Ta single crystal

We present a detailed experimental and theoretical study of nuclear acoustic resonance line-shape functions in ${}_{}{}^{181}{}_{}{}^{}\mathrm{Ta}$ metal. Strong evidence is presented that the dominant spin-spin interaction in this substance is isotropic quadrupolar exchange. Further, we demonstrate that physical parameters can be extracted from line-shape measurements even in the presence of significant inhomogeneous broadening.