Abstract

By applying the HAUP (high-accuracy universal polarimeter) method, (C3H7NH3)2MnCl4 was found to be optically active in its incommensurate phases, e.g., g33=1.1×10-5 in the γ phase at 83.0°C and g33=2.4×10-5 in the ε phase at -139.0°C. The temperature dependence of g33 was obtained. Commensurate domains were found to begin to grow below -139°C in the ε phase.

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