Ultrasonic velocity and attenuation of Rb 2 ZnCl 4 were measured around the normal-incommensurate transition. From the velocity change of the transverse wave the critical exponent 2β was determined to be 2β=0.62±0.05, which is very close to the three-dimensional Ising exponent.
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Matsuda et al. (1980) studied this question.
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