Volume 49, Number 5, March I 2000
|Page(s)||610 - 616|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Low-frequency dynamics in molecular incommensurate composite: Specific heat of nonadecane/urea inclusion compound
Groupe Matière Condensée et Matériaux, UMR CNRS-Université de Rennes I
6626 35042 Rennes Cedex, France
2 Centre de Recherches sur les Très Basses Températures, CNRS 38042 Grenoble Cedex, France
3 Laboratoire de Physico-Chimie Moléculaire UMR CNRS-Université de Bordeaux I 5803 - 33405 Talence, France
4 Facultad de Ciencias, Universidad del Pais Vasco - Apdo 644, Bilbao, Spain
Accepted: 15 December 1999
We report the first very low-temperature specific-heat data of the incommensurate n-nonadecane/urea inclusion compound. In addition to the contribution due to normal acoustic phonons, the results show a linear temperature dependence of the specific heat below 1.5 K, assigned to the dynamical disorder of the guest molecules. The excess heat capacity around 4.5 K reveals the low-frequency contribution of nondispersive modes. In contrast to the case of modulated incommensurate compounds, no pinned sliding mode, phason-like mode, could be detected.
PACS: 65.40.+g – Heat capacities of solids / 61.43.-j – Disordered solids / 61.44.Fw – Incommensurate crystals
© EDP Sciences, 2000
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