Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components
Collective modes are studied in superfluid helium when the normal and superfluid components have a relative velocity w. In this paper the general dispersion relation for first and second sound modes is obtained for arbitrary values of w, and we have found the relationship between the amplitudes of...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2008 |
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| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2008
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components / I.N. Adamenko, K.E. Nemchenko, V.A. Slipko, A.F.G. Wyatt // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 357–366. — Бібліогр.: 17 назв. — англ. |
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nasplib_isofts_kiev_ua-123456789-116916 |
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Adamenko, I.N. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. 2017-05-18T10:28:53Z 2017-05-18T10:28:53Z 2008 Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components / I.N. Adamenko, K.E. Nemchenko, V.A. Slipko, A.F.G. Wyatt // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 357–366. — Бібліогр.: 17 назв. — англ. 0132-6414 PACS: 67.25.D–;67.25.dt https://nasplib.isofts.kiev.ua/handle/123456789/116916 Collective modes are studied in superfluid helium when the normal and superfluid components have a relative velocity w. In this paper the general dispersion relation for first and second sound modes is obtained for arbitrary values of w, and we have found the relationship between the amplitudes of the oscillating variables for first sound. It is shown in a first sound wave, that both temperature and pressure can oscillate, and moreover, the normal fluid velocity can exceed the superfluid velocity in the wave. In the general case of first sound, the normal fluid not only has a velocity component parallel to the wave vector, but also a transverse velocity component. It is shown that when there is only a phonon system in the helium, the amplitude of the temperature oscillation in a first sound wave in an anisotropic phonon system, can exceed that in a second sound wave in an isotropic phonon system, for similar values of the normal fluid density. We express our gratitude to EPSRC of the UK (grant EP/F 019157/1) for support of this work. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Жидкий гелий Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components |
| spellingShingle |
Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components Adamenko, I.N. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. Жидкий гелий |
| title_short |
Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components |
| title_full |
Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components |
| title_fullStr |
Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components |
| title_full_unstemmed |
Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components |
| title_sort |
collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components |
| author |
Adamenko, I.N. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. |
| author_facet |
Adamenko, I.N. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. |
| topic |
Жидкий гелий |
| topic_facet |
Жидкий гелий |
| publishDate |
2008 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
Collective modes are studied in superfluid helium when the normal and superfluid components have a
relative velocity w. In this paper the general dispersion relation for first and second sound modes is obtained
for arbitrary values of w, and we have found the relationship between the amplitudes of the oscillating variables
for first sound. It is shown in a first sound wave, that both temperature and pressure can oscillate, and
moreover, the normal fluid velocity can exceed the superfluid velocity in the wave. In the general case of
first sound, the normal fluid not only has a velocity component parallel to the wave vector, but also a transverse
velocity component. It is shown that when there is only a phonon system in the helium, the amplitude
of the temperature oscillation in a first sound wave in an anisotropic phonon system, can exceed that in a second
sound wave in an isotropic phonon system, for similar values of the normal fluid density.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/116916 |
| citation_txt |
Collective modes in superfluid helium when there is a relative velocity between the normal and superfluid components / I.N. Adamenko, K.E. Nemchenko, V.A. Slipko, A.F.G. Wyatt // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 357–366. — Бібліогр.: 17 назв. — англ. |
| work_keys_str_mv |
AT adamenkoin collectivemodesinsuperfluidheliumwhenthereisarelativevelocitybetweenthenormalandsuperfluidcomponents AT nemchenkoke collectivemodesinsuperfluidheliumwhenthereisarelativevelocitybetweenthenormalandsuperfluidcomponents AT slipkova collectivemodesinsuperfluidheliumwhenthereisarelativevelocitybetweenthenormalandsuperfluidcomponents AT wyattafg collectivemodesinsuperfluidheliumwhenthereisarelativevelocitybetweenthenormalandsuperfluidcomponents |
| first_indexed |
2025-12-07T17:54:39Z |
| last_indexed |
2025-12-07T17:54:39Z |
| _version_ |
1850873038492401664 |