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Disorder effects on heat transport properties of orientationally disordered crystals

AuthorsSharapova, I.V.; Krivchikov, A. I.; Korolyuk, O. A.; Jezowski, A.; Rovira-Esteva, M.; Tamarit, J. Ll.; Pardo, L. C.; Ruiz-Martin, M. D.; Bermejo, Francisco Javier
Issue Date30-Mar-2010
PublisherAmerican Physical Society
CitationPhysical Review B - Condensed Matter and Materials Physics 81: 094205 (2010)
AbstractThe 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
Description6 págs.; 3 figs.; 2 tabs. ; PACS number s : 65.60. a, 66.70. f, 61.43. j, 63.50. x
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.81.094205
Identifiersdoi: 10.1103/PhysRevB.81.094205
issn: 1098-0121
Appears in Collections:(CFMAC-IEM) Artículos
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