Enhancement of Heat Pulses in Crystals due to Elastic Anisotropy
作者:
Humphrey J. Maris,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1971)
卷期:
Volume 50,
issue 3B
页码: 812-818
ISSN:0001-4966
年代: 1971
DOI:10.1121/1.1912705
出版商: Acoustical Society of America
数据来源: AIP
摘要:
The generation of thermal acoustic waves by a heated metallic film on the surface of a dielectric crystal at low temperatures is discussed. It is shown that even if the waves produced correspond to a uniform distribution of directions of wave vector, there may be a large enhancement of energy flow in some crystallographic directions compared to the average. This effect arises because of elastic anisotropy. Explicit expressions are given for the enhancement expected in the principal directions of cubic crystals.
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