The optical study of BaMnF₄ in incommensurate phase

T. Asahi Department of Applied Physics, Waseda University, 3-4-1, Ohkubo, Shinjuku-ku, Tokyo, 160, Japan

K. Uchino Department of Applied Physics, Waseda University, 3-4-1, Ohkubo, Shinjuku-ku, Tokyo, 160, Japan

J. Kobayashi Department of Applied Physics, Waseda University, 3-4-1, Ohkubo, Shinjuku-ku, Tokyo, 160, Japan

W. Kleemann Department of Applied Physics, Waseda University, 3-4-1, Ohkubo, Shinjuku-ku, Tokyo, 160, Japan; Angewandte Physik, Universität-GH-Duisburg, Postfach 101629, 4100 1. Fed. Rep, Duisburg, Germany

Abstract

Accurate measurements of birefringence, optical activity and rotation of the optical indicatrix of BaMnF₄ have been made by using HAUP method near the incommensurate transition point of 250 K. The IC phase is optically active below T_i and the indicatrix rotates below T_i around all the crystallographic axes.

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The optical study of BaMnF₄ in incommensurate phase