Low-temperature thermal and elastoacoustic properties of butanol glasses: Study of position isomerism effects around the boson peak
Entidad
UAM. Departamento de Física de la Materia CondensadaEditor
American Physical SocietyFecha de edición
2012-03-19Cita
10.1103/PhysRevB.85.104206
Physical Review B 85.10 (2012): 104206
ISSN
1098-0121; 1550-235XDOI
10.1103/PhysRevB.85.104206Financiado por
We acknowledge financial support by the Spanish Ministry of Science within program CONSOLIDER Nanociencia Molecular CSD2007-00010 and by the Comunidad de Madrid through the project NANOBIOMAGNET S2009/MAT-1726.Proyecto
Gobierno de España. CSD2007-00010; Comunidad de Madrid. S2009/MAT-1726/NANOBIOMAGNETVersión del editor
http://dx.doi.org/10.1103/PhysRevB.85.104206Materias
FísicaDerechos
© 2012 American Physical SocietyResumen
We have concurrently measured the specific heat, the thermal conductivity, and the longitudinal and transverse sound velocities at low temperature of glasses from different isomers of butanol (n-butanol, sec-butanol and isobutanol), as well as the low-temperature specific heat for the crystals of n-butanol, isobutanol and tert-butanol. Whereas the elastic constants both for crystals and glasses are found to be almost independent of the position of the hydrogen bonds, the thermal properties at low temperatures of these glasses at a few kelvin (around the boson peak in the reduced specific heat or around the plateau in the thermal conductivity) are found to vary strongly. Our experiments clearly contradict other works or models claiming a Debye scaling of the boson peak, and hence of the excess low-temperature specific heat of glasses. Data analysis based upon the soft-potential model and its extensions allows us to estimate the Ioffe-Regel limit in these and other alcohol glasses, finding a correlation with the boson-peak position in agreement with that previously reported by other groups
Lista de ficheros
Google Scholar:Hassaine, Merzak
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Ramos Ruiz, Miguel Ángel
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Krivchikov, A. I.
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Sharapova, I. V.
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Korolyuk, O. A.
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Jiménez-Riobóo, Rafael J.
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