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Anisotropic Thermal Relaxation Dynamics in TGS Studied by Impulsive Stimulated Light Scattering

An ultraslow relaxational mode with a relaxation time τ= 5 ∼8 µsec is discovered for the first time near the phase transition temperature T c = 48.5°C in uniaxial ferroelectric triglycine sulfate (NH 2 CH 2 COOH) 3 ·H 2 SO 4 using time-resolved spectroscopy. The physical origin of the mode is assigned to be thermal relaxation, because dominant anisotropic anomalous behavior can be observed in the Bragg-diffracted mode intensity at time origin I (0) and can be well explained by the anisotropic anomaly of the thermal expansion coefficient α and the anomaly of the specific heat at constant stress C X . The thermal diffusivity D t h evaluated from τ also shows the anisotropic anomalous behavior. This behavior is successfully interpreted by the anisotropic polarization fluctuation characteristic of the structural phase transitions of uniaxial ferroelectrics.