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Effects of resonant phonon scattering from internal molecular modes on the thermal conductivity of molecular glasses

AutorKrivchikov, A. I.; Yushchenko, A. N.; Korolyuk, O. A.; Bermejo, Francisco Javier ; Fernández-Perea, Ricardo ; Bustinduy, Ibón ; González, M. A.
Palabras claveGlass
Organic compounds
Phonon dispersion relations
Thermal conductivity
Fecha de publicación10-ene-2008
EditorAmerican Physical Society
CitaciónPhysical Review B 77(2): 024202 (2008)
ResumenThe thermal conductivity к(T) of the crystalline and glassy phases of the two isomers of propyl alcohol has been measured. The two isomers differ by a minor chemical detail involving the position of the hydroxyl group with respect to the carbon backbone. Such a difference in molecular structure leads, however, to disparate behaviors for the temperature dependence of к(T), for both glass and crystal states. The к(T) for the glass shows for 1-propanol an anomalously large plateau region comprising temperatures within 6–90 K, while data for isomeric 2-propanol show only a small plateau up to 10 K which is comparable to data on lower alcohols. The results emphasize the role played by internal molecular degrees of freedom as sources of strong resonant phonon scattering.
Descripción8 pages, 4 figures, 2 tables.-- PACS nrs.: 61.43.Fs; 65.60.+a; 66.10.C-; 63.50.-x.
Versión del editorhttp://link.aps.org/doi/10.1103/PhysRevB.77.024202
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