Sound propagation in liquid He in impurity-helium solids
The observed features of the attenuation of ultrasound in Im–He samples created after the introduction of impurity particles (D₂,N₂, Ne, Kr) in a volume of helium II show that a porous substance consisting of a loosely interconnected continuous network is created. It is formed by impurity particles...
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| Published in: | Физика низких температур |
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| Date: | 2000 |
| Main Authors: | , , |
| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2000
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/129208 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Sound propagation in liquid He in impurity-helium solids / S.I. Kiselev, V.V. Khmelenko, D.M. Lee // Физика низких температур. — 2000. — Т. 26, № 9-10. — С. 874-883. — Бібліогр.: 33 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862730138496532480 |
|---|---|
| author | Kiselev, S.I. Khmelenko, V.V. Lee, D.M. |
| author_facet | Kiselev, S.I. Khmelenko, V.V. Lee, D.M. |
| citation_txt | Sound propagation in liquid He in impurity-helium solids / S.I. Kiselev, V.V. Khmelenko, D.M. Lee // Физика низких температур. — 2000. — Т. 26, № 9-10. — С. 874-883. — Бібліогр.: 33 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | The observed features of the attenuation of ultrasound in Im–He samples created after the introduction of impurity particles (D₂,N₂, Ne, Kr) in a volume of helium II show that a porous substance consisting of a loosely interconnected continuous network is created. It is formed by impurity particles encapsulated in solidified helium. The propagation of ordinary sound in these porous samples is similar to the fast sound mode in light aerogels. The temperature dependence of the attenuation for different Im–He samples is investigated. It is established that the character of the attenuation in D₂–He samples is considerably different from that in heavier Im–He solids (Im=N₂, Ne, Kr). Analysis of the attenuation leads to the conclusion that Im–He samples have a wide distribution of pores, from 8 nm to 800 nm. The study of ultrasound in helium in Im–He samples near the λ point shows the presence of broadening in the attenuation peak as compared with bulk liquid helium. The suppression of Tc is very small, ≤ 0.2 mK.
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| first_indexed | 2025-12-07T19:18:53Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-129208 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T19:18:53Z |
| publishDate | 2000 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Kiselev, S.I. Khmelenko, V.V. Lee, D.M. 2018-01-16T19:03:17Z 2018-01-16T19:03:17Z 2000 Sound propagation in liquid He in impurity-helium solids / S.I. Kiselev, V.V. Khmelenko, D.M. Lee // Физика низких температур. — 2000. — Т. 26, № 9-10. — С. 874-883. — Бібліогр.: 33 назв. — англ. 0132-6414 PACS: 67.40.Yv, 67.40.Mj https://nasplib.isofts.kiev.ua/handle/123456789/129208 The observed features of the attenuation of ultrasound in Im–He samples created after the introduction of impurity particles (D₂,N₂, Ne, Kr) in a volume of helium II show that a porous substance consisting of a loosely interconnected continuous network is created. It is formed by impurity particles encapsulated in solidified helium. The propagation of ordinary sound in these porous samples is similar to the fast sound mode in light aerogels. The temperature dependence of the attenuation for different Im–He samples is investigated. It is established that the character of the attenuation in D₂–He samples is considerably different from that in heavier Im–He solids (Im=N₂, Ne, Kr). Analysis of the attenuation leads to the conclusion that Im–He samples have a wide distribution of pores, from 8 nm to 800 nm. The study of ultrasound in helium in Im–He samples near the λ point shows the presence of broadening in the attenuation peak as compared with bulk liquid helium. The suppression of Tc is very small, ≤ 0.2 mK. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Low-Temperature Physics and Chemistry in Cryomatrice Sound propagation in liquid He in impurity-helium solids Article published earlier |
| spellingShingle | Sound propagation in liquid He in impurity-helium solids Kiselev, S.I. Khmelenko, V.V. Lee, D.M. Low-Temperature Physics and Chemistry in Cryomatrice |
| title | Sound propagation in liquid He in impurity-helium solids |
| title_full | Sound propagation in liquid He in impurity-helium solids |
| title_fullStr | Sound propagation in liquid He in impurity-helium solids |
| title_full_unstemmed | Sound propagation in liquid He in impurity-helium solids |
| title_short | Sound propagation in liquid He in impurity-helium solids |
| title_sort | sound propagation in liquid he in impurity-helium solids |
| topic | Low-Temperature Physics and Chemistry in Cryomatrice |
| topic_facet | Low-Temperature Physics and Chemistry in Cryomatrice |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/129208 |
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