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Abstract
The relaxation time of 87Rb in the RbMnCl3 single crystals grown by the Czochralski method has been investigated using a Bruker MSL 200 FT NMR spectrometer. The NMR spectra of two lines are represented by Rb(I) and Rb(II) sites with two physically inequivalent positions. The Rb(I) nucleus located at the corners of faces was found to nearly constant at all temperatures, whereas the Rb (II) connected along the c - axis was observed to exhibit temperature dependence near Tc. The short spin - lattice relaxation time of Rb(II) near Tc may be due to the fact that the Rb(II) significantly moves along the c - axis. From our experimental result, it is proposed that the RbMnCl3 single crystal has a transition point at approximately 279 K.