Abstract
Rb 2 MnCl 4 ·2 H 2 O becomes antiferromagnetic below TN = 2.24°K. Measurements of the nuclear spin-lattice relaxation time Tln have been made as a function of temperature from 1.6° to 0.32°K for four nuclei. The resonance lines studied are characterized by the following frequencies at 1.1°K: 18.1 MHz for 1H, 8.53 MHz for 35Cl, 3.22 MHz for 85Rb, and 3.89 MHz for 87Rb. Standard rf pulse techniques were used and the measurements were made in zero external magnetic field. The results, discussed in terms of magnon relaxation mechanisms, suggest the following conclusions: (1) the relaxation is not due to paramagnetic impurities, (2) the temperature dependence of Tln, qualitatively the same for all four lines, is influenced by a large energy gap in the magnon spectrum, and (3) the dominant relaxation mechanism is probably a two-magnon Raman process, though lack of detailed information on the magnon spectrum prevents a quantitative comparison with theory.
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