Splitting of the phase transition in TGSe crystal under uniaxial stress
Z. TylczyńskiInstitute of Physics, Adam Mickiewicz University, ul. Umultowska 85 , 61-614, Poznań, PolandA. D. KaraevInstitute of Physics, Adam Mickiewicz University, ul. Umultowska 85 , 61-614, Poznań, Poland ; Faculty of Physics, Samarkand State University, Bul. Universitetskii 15 , Samarkand, UzbekistanB. MrózInstitute of Physics, Adam Mickiewicz University, ul. Umultowska 85 , 61-614, Poznań, Poland
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Abstract Changes in the velocity and attenuation coefficient of quasi-longitudinal waves propagating in TGSe crystal in the direction X induced by uniaxial stress σY were measured in the temperature range of ferroelectric phase transition. The application of uniaxial stress was found to shift the phase transition temperature by ∂TC/∂σY = −0.18 K/MPa. For the stress greater than 2 MPa an additional anomaly in the wave velocity and attenuation appears, which has been interpreted as a splitting of the phase transition.
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