Optical investigations in [N(CH₃)₄]₂MnCl₄

A. Fuith Institute of Experimental Physics, Vienna University, 1090, Wien, Austria

W. Schranz Institute of Experimental Physics, Vienna University, 1090, Wien, Austria

H. Warhanek Institute of Experimental Physics, Vienna University, 1090, Wien, Austria

J. Kroupa Institute of Physics, Czech. Acad. Sci, Prague, Czechoslovakia

V. Lhotska Institute of Physics, Czech. Acad. Sci, Prague, Czechoslovakia

Abstract

Some optical investigations including measurements of birefringence and angle between the extinction positions in different domains, have been performed on [N(CH₃)₄]₂MnCl₄, In addition the domain structure has been studied using an optical microscope. The observed anomalies in the birefringence measurements clearly confirm the existence of an incommensurate phase in a temperature interval of 0.6°C.

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Optical investigations in [N(CH₃)₄]₂MnCl₄