Phonon-roton scattering and kinetic coefficients in helium II
| Autor: | Isaak M. Khalatnikov, Yu. A. Matveev |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
Physics
Phonon scattering Condensed matter physics Scattering Phonon Scattering length Inelastic scattering Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Roton Atomic and Molecular Physics and Optics Thermal conductivity Dispersion relation General Materials Science Atomic physics |
| Zdroj: | Journal of Low Temperature Physics. 51:99-116 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/bf00683416 |
| Popis: | Significant factors in the scattering of an energetic phonon by a roton are the inelasticity of the process and the form of the dispersion curve ℰ(P) for rotons, and these factors should be taken into account. We propose a simple method for calculating the scattering cross section based on a dependence ℰ(P) outside the framework of the standard parabolic Landau approximation. The scattering cross section for this process and the phonon contributions to the viscosity and thermal conductivity coefficients are found. The expressions are in good agreement with experiment, without the use of any adjustable parameters. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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