Enhancement of Heat Pulses in Crystals due to Elastic Anisotropy
Enhancement of Heat Pulses in Crystals due to Elastic Anisotropy
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DOI：
10.1121/1.1912705
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发表时间：
1971
影响因子：
2.4
通讯作者：
H. Maris
中科院分区：
文献类型：
--
作者：
H. Maris
本文讨论了低温下介质晶体表面加热金属膜产生热声波的问题。它表明，即使产生的波对应于一个均匀分布的方向的波矢量，可能有一个很大的增强能量流在某些晶体方向相比，平均值。这种效应是由于弹性各向异性而产生的。给出了立方晶体在主方向上的增强效应的显式表达式。
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.