P-31 AND B-11 NMR IN AMORPHOUS NIPB ALLOYS NEAR THE PARAMAGNETIC-FERROMAGNETIC TRANSITION

Knight-shift and nuclear spin-lattice relaxation time measurements have been performed between 4.2°K and room temperature on 11B and 31P in amorphous NiPB alloys near the para-ferromagnetic transition. The EFG parameters on 11B were found to be νQ=200(±20)kHz and η = 0.35 (±0.10). Knight-shift and Korringa spin-lattice relaxation are mainly due to mechanisms involving p electrons. The effect of Ni magnetic clouds results in a broadening of the linewidth. We observed also the occurence of a Giovannini-Heeger-like contribution to the spin-lattice relaxation rate. © 1978.