HEAT PROPAGATION IN GLASSES

被引：5

作者：

STREHLOW, P ^{[1
]}

DREYER, W ^{[1
]}

机构：

[1] TECH UNIV BERLIN,FB 9,W-1000 BERLIN 12,GERMANY

来源：

PHYSICA B | 1994年 / 194卷

关键词：

D O I：

10.1016/0921-4526(94)90572-X

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In order to describe the phonon-related heat propagation in glasses below 1 K we derive thermodynamic field equations that follow from an underlying kinetic theory including the interaction of phonons and tunneling systems. It is shown that the solution of the derived linearized field equation for given boundary and initial values of heat-pulse experiments are in excellent agreement with the experimental data obtained in vitreous silica. Moreover, a new kind of energy propagation in glasses at low temperatures is predicted. Finally, we calculate the time dependence of heat release due to the relaxation of low-energy excitations, and this requires a numerical solution of the nonlinear field equations.

引用

页码：485 / 486

页数：2