Three-phonon relaxation in isotropic and anisotropic phonon systems of liquid helium at different pressures

Three-phonon relaxation in isotropic and anisotropic phonon systems of liquid helium at different pressures

Adamenko, I.N. ; Kitsenko, Yu.A. ; Nemchenko, K.E. ; Slipko, V.A. ; Wyatt, A.F.G.

Тема: Квантовые жидкости и квантовые кpисталлы

Інший ID: PACS: 67.40.Db, 67.40.Fd, 67.90.+z

URI: http://dspace.nbuv.gov.ua/handle/123456789/121479

Посилання: Three-phonon relaxation in isotropic and anisotropic phonon systems of liquid helium at different pressures / I.N. Adamenko, Yu.A. Kitsenko, K.E. Nemchenko, V.A. Slipko, A.F.G. Wyatt // Физика низких температур. — 2005. — Т. 31, № 6. — С. 607-619. — Бібліогр.: 29 назв. — англ.

Підтримка: We express our gratitude to GFFI of Ukraine (grant N02.07/000372), and to EPSRC of the UK (grant EP/C523199/1) for support this work.

Дата: 2005

Завантажень: 469

Three-phonon relaxation in isotropic and anisotropic phonon systems of liquid helium at different pressures

Анотація:

Starting from the kinetic equation for phonons in superfluid helium, expressions for the rates of three-phonon scattering in isotropic and anisotropic phonon systems were obtained for different pressures. These expressions are valid in the whole range of energies where three-phonon processes are allowed. Limiting cases were analysed and compared with the results of previous theoretical investigations. The obtained pressure and angular dependence of three phonon scattering rate allows one to explaine of the experimental data on interaction of phonon pulses.

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