Трехфононные взаимодействия и начальный этап эволюции фононного пучка в He II

Автор(и)

  • M. A. H. Tucker School of Physics, University of Exeter, Exeter, EX4 4QL, UK
  • A. F. G. Wyatt School of Physics, University of Exeter, Exeter, EX4 4QL, UK
  • I. N. Adamenko,A. V. Zhukov Kharkov State University, Svobody sq.4, 310077 Kharkov, Ukraine
  • K. E. Nemchenko Kharkov State University, Svobody sq.4, 310077 Kharkov, Ukraine

DOI:

https://doi.org/10.1063/1.593772

Ключові слова:

PACS: 67.40.Db, 67.40.Fd, 67.90. z

Анотація

Starting from the hydrodynamic Landau Hamiltonian we derived an expression for the characteristic rate of three-phonon processes in superfluid 4He, which is valid in the whole range of phonon energies where these processes are allowed. Possible limiting cases are analized and a comparison with the results of previous investigations is done. The three-phonon processes are turned out to govern completely the initial relaxation of a phonon pulse injected into He II by a heated solid. This results in an equilibrium phonon distribution in the anomalous region of phonon dispersion at times of the order 10-10s.

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Опубліковано

1999-07-10

Як цитувати

(1)
Tucker, M. A. H.; Wyatt, A. F. G.; Zhukov, I. N. A. V.; Nemchenko, K. E. Трехфононные взаимодействия и начальный этап эволюции фононного пучка в He II. Fiz. Nizk. Temp. 1999, 25, 657-663.

Номер

Том 25 № 7 (1999)

Розділ

Квантові рідини та квантові кристали

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