Light scattering studies on the phase transitions in [N(CH₃)₄]₂ZnCl₄

A. Yoshihara Research Institute for Scientific Measurements, Tohoku University, Katahira, Sendai, 980, Japan

H. Satoh Research Institute for Scientific Measurements, Tohoku University, Katahira, Sendai, 980, Japan

M. Takahashi Research Institute for Scientific Measurements, Tohoku University, Katahira, Sendai, 980, Japan

T. Yamakami Research Institute for Scientific Measurements, Tohoku University, Katahira, Sendai, 980, Japan

H. Arashi Research Institute for Scientific Measurements, Tohoku University, Katahira, Sendai, 980, Japan

T. Fujimura Research Institute for Scientific Measurements, Tohoku University, Katahira, Sendai, 980, Japan

Abstract

The successive phase transitions in [N(CH₃)₄]₂ZnCl₄ have been investigated through Brillouin and Raman scattering. Frequency dispersion of the sound velocity has been found in the incommensurate phase for the [001] La-phonon and the relaxation time is determined as τ = 2.2 × 10⁻¹⁰/(T ₄−T) sec with T ₁ = 296 K. Neither soft mode nor critical relaxation mode has been observed in the incommensurate phase by Raman scattering.

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Light scattering studies on the phase transitions in [N(CH₃)₄]₂ZnCl₄

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Light scattering studies on the phase transitions in [N(CH₃)₄]₂ZnCl₄