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The phason energy gap has been observed to increase on going from the incommensurate to higher-order commensurate phases in the "devil's staircase" compound [N(CH₃)₄]₂ZnCl₄. The gap was determined via the phason-induced ¹⁴N spin-lattice relaxation contribution, which was obtained from the variation of the effective spin-lattice relaxation rate over the inhomogeneous incommensurate frequency distribution. Here, as well as in Rb₂ZnCl₄ and Rb₂ZnBr₄, the phason gap in the incommensurate phase is defect induced.
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Blinc et al. (1985) studied this question.
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