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Specific heat and latent heat of KMnF3 ferroelastic crystal |
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| Authors: | F J Romero M C Gallardo J Jiménez J Del Cerro E K H Salje A Gibaud |
| Institution: | 1. Institute Mixto Ciencia de Materiales CSIC-Universidad de Sevilla , P.O. Box 1065, Sevilla , Spain;2. Department of Earth Sciences , University of Cambridge , Cambridge , Downing Street, CB3 2EQ , UK;3. Université Du Maine-Faculté Des Sciences , URA 807 CNRS, 72017, Le Mans , France |
| Abstract: | The specific heat and the heat flux exchanged by a single crystal of KMnF3 have been measured simultaneously while cooling the sample at constant rate of 0·06 K/h through the phase transition at T 0= 186 K. The phase transition is weakly first order and close to a tricritical point. The temperature dependence at T185 K of the excess specific heat and the excess entropy follow very well the predictions of a Landau potential at a tricritical point. |
| Keywords: | Specific heat Latent heat KMnF3 Ferroelastic phase transition |