Nuclear Spin-Lattice Relaxation in Cadmium and Tin

Abstract

Pulsed nuclear-magnetic-resonance measurements of the spin-lattice relaxation time ${T}_{1}$ in ${\mathrm{Cd}}^{113}$ and ${\mathrm{Sn}}^{119}$ from 77 to 820\ifmmode^\circ\else\textdegree\fi{}K are reported. An enhancement of the Korringa product ${T}_{1}TK_{\mathrm{iso}}^{}{}_{}{}^{2}$ that is constant with temperature but different in the solid and liquid states is observed. For ${\mathrm{Cd}}^{113}$, the difference between the liquid and solid enhancement is significant and can be related to a core-polarization or orbital contribution to the isotropic Knight shift ${K}_{\mathrm{iso}}$. In solid ${\mathrm{Cd}}^{113}$, the sum of these two contributions to ${K}_{\mathrm{iso}}$ is about -9% as large as the contribution from the contact hyperfine interaction and that fraction is independent of temperature. In liquid ${\mathrm{Cd}}^{113}$ and solid and liquid ${\mathrm{Sn}}^{119}$, the sum of these contributions is probably small.