LOW-TEMPERATURE THERMAL-CONDUCTIVITY OF BCC HE-3

被引：16

作者：

GREENBERG, AS ^{[1
]}

ARMSTRONG, G ^{[1
]}

机构：

[1] COLORADO STATE UNIV,DEPT PHYS,FT COLLINS,CO 80523

来源：

PHYSICAL REVIEW B | 1979年 / 20卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.20.1050

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The thermal conductivity of bcc He3 has been measured between 30 and 600 mK for a wide range of molar volumes. For carefully grown samples, the conductivity exhibited a T3 temperature dependence. This dependence is characteristic of diffuse phonon boundary scattering with a temperature-independent mean free path, and a phonon specific heat which is in agreement with calorimetry measurements on bulk bcc He3. We were also able to grow samples for which the temperature dependence of the conductivity was less than cubic. These results are interpreted as the presence of another phonon-scattering mechanism in addition to boundary scattering. This scattering mechanism has a temperature dependence suggestive of edge dislocations in crystals. Several variations in sample growth techniques were performed, and these results support our interpretation of the presence of structural crystalline defects. © 1979 The American Physical Society.

引用

页码：1050 / 1060

页数：11

共 31 条

[1] SOME OBSERVATIONS ON RESISTANCE THERMOMETRY BELOW 1K [J].