Normal processes of phonon-phonon scattering and the drag thermopower in germanium crystals with isotopic disorder
| Autor: | Kohei M. Itoh, A. V. Inyushkin, V. I. Ozhogin, Eugene E. Haller, I. G. Kuleev, Alexander N. Taldenkov, I. I. Kuleev |
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| Rok vydání: | 2003 |
| Předmět: |
Materials science
Phonon scattering Condensed matter physics Phonon Scattering General Physics and Astronomy chemistry.chemical_element Germanium Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter::Materials Science Thermal conductivity chemistry Drag Condensed Matter::Superconductivity Relaxation (physics) Condensed Matter::Strongly Correlated Electrons Nuclear Experiment Phonon drag |
| Zdroj: | Journal of Experimental and Theoretical Physics. 96:1078-1088 |
| ISSN: | 1090-6509 1063-7761 |
| DOI: | 10.1134/1.1591219 |
| Popis: | A strong dependence of the thermopower of germanium crystals on the isotopic composition is experimentally found. The theory of phonon drag of electrons in semiconductors with nondegenerate statistics of current carriers is developed, which takes into account the special features of the relaxation of phonon momentum in the normal processes of phonon-phonon scattering. The effect of the drift motion of phonons on the drag thermopower in germanium crystals of different isotopic compositions is analyzed for two options of relaxation of phonon momentum in the normal processes of phonon scattering. The phonon relaxation times determined from the data on the thermal conductivity of germanium are used in calculating the thermopower. The importance of the inelasticity of electron-phonon scattering in the drag thermopower in semiconductors is analyzed. A qualitative explanation of the isotope effect in the drag thermopower is provided. It is demonstrated that this effect is associated with the drift motion of phonons, which turns out to be very sensitive to isotopic disorder in germanium crystals. |
| Databáze: | OpenAIRE |
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