Uniaxial stress dependence of the elastic wave propagation near normal—incommensurate phase transition in (NH₄)₂ZnCl₄

Abstract The effect of uniaxial σ2 stress on the velocity and attenuation of longitudinal ultrasonic wave propagating along the [001] direction in an NH4)2ZnCl4 crystal was studied in the vicinity of the orthorhombic — incommensurate phase transition. A stress induced shift of the transition temperature is dT1/dσ2= 0.2 K/MPa. Application of stress greater that 5 MPa results in the appearance of additional anomalies of velocity and attenuation, which are interpreted as manifestations of a new phase induced by uniaxial Stress.

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