抄録
The nuclear spin-lattice relaxation times T1 for Mn55, Sb121 and Sb123 in ferromagnetic intermetallic compound MnNiSb have been measured in applied magnetic field above 6 kOe in the temperature range between 4.2 and 600 K.
Below 250 K the relaxation rates T1−1 for the three nuclei are proportional to the temperature T, while above 250 K they are expressed as T1−1=aT+bT3.8±0.2, where T1 is in unit of second, and a=2.9, 2.5 and 0.74 for Mn55, Sb121 and Sb123, respectively, and b=8.1×10−8, 7.7×10−8, 2.3×10−8 for Mn55, Sb121 and Sb123, respectively. The relaxation is mainly due to the interaction between the nuclear spins and conduction electrons via spin waves at low temperatures, and due to the three magnon process at high temperatures.
