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The effect of hydrostatic pressure on the Jahn-Teller induced phase transition in CsCuCl 3 (146°C at 0 GPa) was studied by dielectric measurements. The transition temperature decreases with increasing pressure with a rate of d T c /d p =-6.6 K GPa -1 . The pressure effect is much insignificant than those in ABX 3 compounds which are caused by condensations of zone boundary soft phonons.
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Gesi et al. (1984) studied this question.
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