Nuclear Spin-Lattice Relaxation in Ferromagnetic MnNiSb

概要

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The nuclear spin-lattice relaxation times T_1 for Mn^<55>, Sb^<121> and Sb^<123> 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 T_<1^-1> for the three nuclei are proportional to the temperature T, while above 250 K they are expressed as T_<1^-1>=aT+bT^<3.8±0.2>, where T_1 is in unit of second, and a=2.9, 2.5 and 0.74 for Mn^<55>, Sb^<121> and Sb^ <123>, respectively, and b=8.1×10^<-8>, 7.7×10^<-8>, 2.3×10^<-8> for Mn^<55>, Sb^<121> and Sb^<123>, 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.
社団法人日本物理学会の論文
1971-10-05