Studies on ^<133>Cs NMR Spectra and Spin-Lattice Relaxation Times in Incommensurate Cs_2HgCl_4 : Condensed Matter: Structure, etc.

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^<133>Cs NMR spectra and the spin-lattice relaxation times, T_1, in Cs_2HgCl_4 crystals were measured in the ranges of 160-361 K and 160-371 K, respectively. The central lines of the spectra show small splittings characteristic of the incommensurate (IC) phase. The splitting increases with decreasing temperature. The critical exponent ζ of T_1 at the phase transition from normal (N) to IC phase was determined to be 0.615±0.025 in the high-temperature side of the transition, which is in good agreement with the three-dimensional XY model predicting the one-dimensional modulation wave in the IC phase. The frequency dependence of T_1 in the IC phase can be explained by the fluctuations of phason with a small gap, 0-5 MHz, and amplitudon.
社団法人日本物理学会の論文
2000-03-15