The temperature and impurity-concentration dependence of the phason gap in mixed incommensurate (Rb_1-xKₓ)₂ZnCl₄ has been studied via the phason-induced ⁸⁷Rb spin-lattice-relaxation contribution. The results yield novel information on the nature of the coupling of the impurities to the incommensurate modulation wave and allow for a discrimination between random-field and random-interaction effects.
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Blinc et al. (1986) studied this question.
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