Properties of the secondary order parameter in Rb2ZnCl4 |
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Authors: | H-G Unruh J Strömich |
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Institution: | Fachbereich Physik der Universität des Saarlandes, D-66 Saarbrücken, FRG |
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Abstract: | The dielectric constants and the spontaneous polarization of Rb2ZnCl4-crystals have been investigated in order to characterize the nature of the transitions at 303, 195 and 74.5 K. The dielectric anomalies around 303 K hint at a critical exponent β = 0.36 ± 0.03 in the incommensurate phase. Close to 195 K the commensurate state can be induced by electric fields in agreement with an appropriate Clausius-Clapeyron relation. The polarization measurements further show that Rb2ZnCl4 has a (second) ferroelectric transformation at 74.5 K. |
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