Thermal transport in heavily deformed and γ -irradiated LiF at temperatures near 1 k
Thermal transport in heavily deformed and γ -irradiated LiF at temperatures near 1 k
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接近 1 k 温度下严重变形和 γ 辐照的 LiF 中的热传输
DOI：
10.1016/0022-3697(83)90123-3
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发表时间：
1983
影响因子：
4
通讯作者：
A. Anderson
中科院分区：
文献类型：
--
作者：
E. Cotts;S. Shore;A. Anderson
在样品暴露于γ辐照后，在温度大于或等于0.5 K下测量了严重变形的liff晶体的导热系数κ。这一结果与最近在≈4 K的等效温度下类似样品中弹道声子传播的测量结果一致。在严重变形的晶体中，有一部分声子的平均自由程为1厘米，γ辐照增加了具有较长平均自由程的声子的比例。测量结果支持声子位错相互作用的动态（而不是静态）模型。
The thermal conductivity κ of heavily deformed LiF crystals has been measured at temperaturesT⩾ 0.5 K following exposure of the samples to γ irradiation. The results are in agreement with recent measurements of ballistic phonon propagation in similar samples at an equivalent temperature of ≈ 4 K. A fraction of the phonons have a mean free path of order 1 cm in the heavily deformed crystal, and γ-irradiationincreasesthe fraction having a long mean free path. The measurements support a dynamic (as opposed to static) model of phonon-dislocation interaction.