Nuclear magnetic resonance and relaxation in liquid Ga and GaSb

Measurements of the Knight shift and nuclear-spin-lattice relaxation rate of ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ga}$ and ${}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}$ in liquid Ga, and ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ga}$, ${}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}$, ${}_{}{}^{121}{}_{}{}^{}\mathrm{Sb}$, and ${}_{}{}^{123}{}_{}{}^{}\mathrm{Sb}$ in liquid GaSb are reported over temperatures ranging from the supercooled regions up to 1250-1373 K. From the Knight shifts of ${}_{}{}^{121}{}_{}{}^{}\mathrm{Sb}$ and ${}_{}{}^{123}{}_{}{}^{}\mathrm{Sb}$ in GaSb, the hyperfine structure anomaly of the Sb isotopes is measured. An attempt to relate the observed quadrupolar relaxation rates to existing theories based on ionic diffusion models indicates that the latter are not adequate to explain all aspects of the observations. In the case of liquid GaSb, the quadrupolar coupling was found to be much stronger for Sb than for Ga. It is proposed that this is caused by an effect of alloying on the antishielding factors.