ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Origin of the plateau in the low-temperature thermal conductivity of silica

Raychaudhuri, Arup K (1989) Origin of the plateau in the low-temperature thermal conductivity of silica. In: Physical Review B: Condensed Matter, 39 (3). pp. 1927-1931.

[img] PDF
origin.pdf - Published Version
Restricted to Registered users only

Download (879Kb) | Request a copy
Official URL: http://prb.aps.org/abstract/PRB/v39/i3/p1927_1

Abstract

Thermal conductivities of glasses at low temperatures show strikingly similar behavior irrespective of their chemical composition. While for T<1 K the thermal conductivity can be understood in the phenomenological tunneling model; the ‘‘universal plateau’’ in the temperature interval 15>T>2 K is totally unexplained. While Rayleigh scattering of phonons by structural disorder should be the natural cause for limiting the mean free path of phonons in this temperature range, it has been concluded before that in glasses a strong enough source of such scattering does not exist. In this study we show by a proper structural analysis in at least one material (namely, silica) that a strong enough source of Rayleigh scattering of phonons in glasses does exist so that the ‘‘universal plateau’’ can be explained without invoking any new mechanism. This may be for the first time that the low-temperature property of a structural glass has been correlated to its structure.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Oct 2010 08:49
Last Modified: 19 Oct 2010 08:49
URI: http://eprints.iisc.ernet.in/id/eprint/33246

Actions (login required)

View Item View Item