Experimental results about the anharmonicity in fluoperovskites

C. Ridou Laboratoire de Physique de l'Etat Condensé, E. R. A. n° 682, Université, du Maine, 72017, LE MANS Cedex, FRANCE

M. Rousseau Laboratoire de Physique de l'Etat Condensé, E. R. A. n° 682, Université, du Maine, 72017, LE MANS Cedex, FRANCE

J. Y. Gesland Laboratoire de Physique de l'Etat Condensé, E. R. A. n° 682, Université, du Maine, 72017, LE MANS Cedex, FRANCE

J. Bouillot Institut Laue Langevin Cedex, n° 156, 38042, GRENOBLE

C. Vettier Institut Laue Langevin Cedex, n° 156, 38042, GRENOBLE

Abstract

From experimental determination of temperature and pressure dependence of the R₂₅ soft mode frequency in RbCaF₃, KZnF₃ and CsCaF₃, it is shown that the overall temperature dependent shift of the soft mode is mainly due to the self energy (thermal expansion effect) being one order of magnitude lower.

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Experimental results about the anharmonicity in fluoperovskites

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Experimental results about the anharmonicity in fluoperovskites

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