Abstract
The spin-lattice relaxation time, T1, for R87b nuclei in Rb2MnCl4 crystals was investigated, and a phase transition was found near 383 K (=TC). The R87b spectrum changes near TC from two central resonance lines due to Rb(1) and Rb(2) to one Rb central resonance line, and this change is due to changes in the local symmetry of the Rb sites near TC. The central resonance lines for Rb nuclei in Rb2MnCl4 crystals are shifted to higher frequencies by the paramagnetic ions. Further, the relaxation times for the Rb(1) and Rb(2) nuclei in Rb2MnCl4 crystals are more or less continuous near TC. Below TC, the spin-lattice relaxation rates, T1−1, for Rb(1) and Rb(2) are proportional to T−2, which implies that these relaxations occur mainly via Raman processes. We also compare our results for Rb2MnCl4 with those reported previously for Rb2BCl4 (B=Co and Zn) and CsBCl3 (B=Mn, Cu, Zn, and Cd) crystals.
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