Disorder effects on heat transport properties of orientationally disordered crystals
| Autor: | J. Ll. Tamarit, Alexander I. Krivchikov, M. Rovira-Esteva, O. A. Korolyuk, Luis Carlos Pardo, M. D. Ruiz-Martín, I. V. Sharapova, Andrzej Jeżowski, F. J. Bermejo |
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| Přispěvatelé: | Generalitat de Catalunya, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (España) |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 6 págs.; 3 figs.; 2 tabs. ; PACS number s : 65.60. a, 66.70. f, 61.43. j, 63.50. x The thermal conductivity k(T) of the orientational glass state of 1,2-difluoro-1,1,2,2-tetrachloroethane (CFCl2-CFCl2, Freon 112) and cyanocyclohexane (C6H11CN) has been measured under equilibrium pressure within the temperature range 2-100 K. The results show that the soft-potential model is able to account for low-temperature data and, indeed, quantitative agreement of all data considered is found within this realm. The details beyond such temperatures are heavily dependent on chemical details and a large plateau is observed for Freon 112 which is rationalized in terms of resonant scattering of phonons by simple oscillators. Such a view is given additional support by the presence of a strong low-frequency feature in the generalized frequency spectrum of the former material as proven by inelastic neutron-scattering spectroscopy. ©2010 The American Physical Society This work was financially supported in part by the Spanish Ministry of Science and Innovation Grants No. FIS2008-00837 and No. MAT2007- 65711-C-4-01 and the Catalan Government Grant No. 2009SGR-1251 and joint projects of NAS of Ukraine and the Russian Foundation for Fundamental Research Grant No. N 9-2009. |
| Databáze: | OpenAIRE |
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