Effect of fluctuations on the NQR spectrum in the incommensurate phase of a Cs2ZnI4 crystal
Popov M. A., Aleksandrova I. P., Primak S. V.
The direct spin-lattice relaxation due to local thermal fluctuations of the amplitude of the atomic-displacement wave in the incommensurate phase of a crystal can strongly influence the lineshape of the resonant spectrum, reducing the intensity of the outermost temperature-dependent peaks in the frequency distribution, while having essentially no effect on the temperature-independent features of this distribution. This effect is apparently the reason for the anomalous behavior of the NQR spectrum of 127I in Cs2ZnI4 in a certain temperature interval near the transition from the "normal" phase to the incommensurate phase.
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![](/ps/1308/article_19773_800_head.png "The direct spin-lattice relaxation due to local thermal fluctuations of the amplitude of the atomic-displacement wave in the incommensurate phase of a crystal can strongly influence the lineshape of the resonant spectrum, reducing the intensity of the outermost temperature-dependent peaks in the frequency distribution, while having essentially no effect on the temperature-independent features of this distribution. This effect is apparently the reason for the anomalous behavior of the NQR spectrum of <sup>127</sup>I in Cs<sub>2</sub>ZnI<sub>4</sub> in a certain temperature interval near the transition from the "normal" phase to the incommensurate phase.")