Fluctuation Effect on the Linear Birefrinegence Behavior near the Normal-Incommensurate Phase Transition of A2BX4 Type Crystals.

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  • Kim Dal–Young
    Department of Physics, Seoul National University, Seoul 151–742, Korea
  • Yoon Jong–Gul
    Department of Physics, University of Suwon, Kyung–gi 445–743, Korea
  • Kwun Sook–Il
    Department of Physics, Seoul National University, Seoul 151–742, Korea

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  • Fluctuation Effect on the Linear Birefrinegence Behavior near the Normal - Incommensurate Phase Transition of A<sub><b>2</b></sub>BX<sub><b>4</b></sub>Type Crystals

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Linear birefringence behavior of Rb2ZnCl4, K2ZnCl4, and [N(CH3)4]2ZnCl4 were studied in the critical region of the normal-incommensurate phase transition. Exisence of linear birefringence tail above the transition temperature was observed. It wasascribed to the fluctuation effect on the linearbirefringence. Results of scaling analysis imply that the exponent of LB behavior is not 1- αbut 2β, contrary to the previous LB study.Contribution of the fluctuation to linear birefringence behavior isdiscussed comparing to XRD experiments.

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