Ferroelastic Domain Formation Mechanism Investigated by Simultaneous Measurements of Light Deflection and Brillouin Scattering

In order to clarify the initial formation process of the ferroelastic domain, we have performed simultaneous measurements of completely different two experiments on a ferroelastic crystal, deuterated potassium trihydrogen selenite. One is a light deflection experiment, which sensitively probes the static nature of the domain structure, while the other is Brillouin spectroscopy, where the dynamical fluctuation related to soft phonons is observed. We have found that the transition temperatures determined by these independent methods clearly show the difference of 0.042 K. We discuss a possible mechanism of the initial domain formation from both the static and dynamic aspects.

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