Thermodynamics of anisotropic phonon systems in superfluid helium
| Autor: | Valeriy A. Slipko, I. N. Adamenko, K. E. Nemchenko, Adrian F. G. Wyatt |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Physics
Condensed matter physics Phonon Thermodynamic equilibrium Isotropy Thermodynamics Atmospheric temperature range Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Superfluidity Condensed Matter::Materials Science symbols.namesake Bose–Einstein statistics Condensed Matter::Superconductivity symbols Condensed Matter::Strongly Correlated Electrons General Materials Science Anisotropy Superfluid helium-4 |
| Zdroj: | Journal of Physics: Condensed Matter. 18:2805-2816 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/18/10/006 |
| Popis: | The thermodynamic functions of anisotropic phonon systems in superfluid helium are calculated for all levels of anisotropy. The results show that the thermodynamic functions of strongly anisotropic phonon systems are essentially different from isotropic ones. It is shown that for strongly anisotropic phonon systems, in thermodynamic equilibrium, the energy density of high-energy phonons, e/kB≥10 K, is more than ten times higher than in a cone with the same total energy density and with the Bose–Einstein distribution for an isotropic system. The stability curve for anisotropic phonon systems is derived and it is shown that strongly anisotropic phonon systems are thermodynamically stable over a wide temperature range. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|