| Autor: | W. Wasserbäch, S. Sahling, S. Abens |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
Condensed matter physics Phonon scattering Phonon Tantalum chemistry.chemical_element Atmospheric temperature range Condensed Matter Physics Thermal conduction Atomic and Molecular Physics and Optics Amorphous solid Condensed Matter::Materials Science Thermal conductivity chemistry General Materials Science Dislocation |
| Zdroj: | Journal of Low Temperature Physics. 123:251-274 |
| ISSN: | 0022-2291 |
| DOI: | 10.1023/a:1017551514241 |
| Popis: | The thermal conductivity and the specific heat of plastically deformed, high-purity tantalum single crystals have been measured together with an amorphous SiO2 specimen in the temperature range between 50 mK and about 2 K. After plastic deformation, the thermal conductivity was reduced by a factor of more than 100 and had a magnitude comparable to that of the amorphous SiO2 specimen. However, the specific heat measurements revealed a T3-relationship for the phonon contribution down to the lowest temperatures with a magnitude as in the case of undeformed crystalline solids. Thus, it must be concluded that the scattering of thermal phonons introduced by the plastic deformation has to be attributed to intrinsic properties of dislocations rather than to the interaction of phonons with tunneling systems. In the present paper the scattering mechanism is related to oscillations of geometrical kinks in non-screw dislocations. |
| Databáze: | OpenAIRE |
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