Search for fourth sound propagation in supersolid ⁴He
A systematic study was carried out to search for fourth sound propagation solid ⁴He samples below 500 mK down to 40 mK between 25 and 56 bar using the techniques of heat pulse generator and titanium superconducting transition edge bolometer. If solid ⁴He is endowed with superfluidity below 200 mK...
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| Дата: | 2008 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2008
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| Назва видання: | Физика низких температур |
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| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/116907 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Search for fourth sound propagation in supersolid ⁴He / Y. Aoki, X. Lin, H. Kojima // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 414–426. — Бібліогр.: 58 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
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irk-123456789-1169072017-05-19T03:03:14Z Search for fourth sound propagation in supersolid ⁴He Aoki, Y. Lin, X. Kojima, H. Твердый гелий A systematic study was carried out to search for fourth sound propagation solid ⁴He samples below 500 mK down to 40 mK between 25 and 56 bar using the techniques of heat pulse generator and titanium superconducting transition edge bolometer. If solid ⁴He is endowed with superfluidity below 200 mK as indicated by recent torsional oscillator experiments, theories predict fourth sound propagation in such supersolid state. If found, fourth sound provides a convincing evidence for superfluidity and a new tool for studying the new phase. To search for a fourth sound-like mode, the response of the bolometers to heat pulses traveling through cylindrical samples of solids grown with different crystal qualities. Bolometers with increasing sensitivity were constructed. The heater generator amplitude was reduced to the sensitivity limit to search for any critical velocity effects. The fourth sound velocity is expected to vary as ∞ √(ρs/s). Searches were made for signature in the bolometer response with such characteristic temperature dependence. The measured response signal has not so far revealed any signature of new propagating mode within the temperature excursion of 5 μK from the background signal shape. Possible reasons for this negative result are discussed. Prior to the fourth sound search, the temperature dependence of heat pulse propagation was studied as it transformed from «second sound» in the normal solid ⁴He to the transverse ballistic phonon propagation. Our work extended the studies by Narayanamurti and Dynes [Phys. Rev. B12, 1731 (1975)] to higher pressures and to lower temperatures. The measured transverse ballistic phonon propagation velocity remained constant, within 0.3% scatter of data below 100 mK at all pressures and revealed no indication for an onset of supersolidity. The overall dynamic thermal response of solid to heat input was found to depend strongly on the sample preparation procedure. 2008 Article Search for fourth sound propagation in supersolid ⁴He / Y. Aoki, X. Lin, H. Kojima // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 414–426. — Бібліогр.: 58 назв. — англ. 0132-6414 PACS: 62.20.–x;63.20.–e;67.80.–s http://dspace.nbuv.gov.ua/handle/123456789/116907 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Твердый гелий Твердый гелий |
| spellingShingle |
Твердый гелий Твердый гелий Aoki, Y. Lin, X. Kojima, H. Search for fourth sound propagation in supersolid ⁴He Физика низких температур |
| description |
A systematic study was carried out to search for fourth sound propagation solid ⁴He samples below
500 mK down to 40 mK between 25 and 56 bar using the techniques of heat pulse generator and titanium
superconducting transition edge bolometer. If solid ⁴He is endowed with superfluidity below 200 mK as indicated
by recent torsional oscillator experiments, theories predict fourth sound propagation in such supersolid
state. If found, fourth sound provides a convincing evidence for superfluidity and a new tool for studying
the new phase. To search for a fourth sound-like mode, the response of the bolometers to heat pulses
traveling through cylindrical samples of solids grown with different crystal qualities. Bolometers with increasing
sensitivity were constructed. The heater generator amplitude was reduced to the sensitivity limit to
search for any critical velocity effects. The fourth sound velocity is expected to vary as ∞ √(ρs/s). Searches
were made for signature in the bolometer response with such characteristic temperature dependence. The
measured response signal has not so far revealed any signature of new propagating mode within the temperature
excursion of 5 μK from the background signal shape. Possible reasons for this negative result are discussed.
Prior to the fourth sound search, the temperature dependence of heat pulse propagation was studied
as it transformed from «second sound» in the normal solid ⁴He to the transverse ballistic phonon propagation.
Our work extended the studies by Narayanamurti and Dynes [Phys. Rev. B12, 1731 (1975)] to higher
pressures and to lower temperatures. The measured transverse ballistic phonon propagation velocity remained
constant, within 0.3% scatter of data below 100 mK at all pressures and revealed no indication for an
onset of supersolidity. The overall dynamic thermal response of solid to heat input was found to depend
strongly on the sample preparation procedure. |
| format |
Article |
| author |
Aoki, Y. Lin, X. Kojima, H. |
| author_facet |
Aoki, Y. Lin, X. Kojima, H. |
| author_sort |
Aoki, Y. |
| title |
Search for fourth sound propagation in supersolid ⁴He |
| title_short |
Search for fourth sound propagation in supersolid ⁴He |
| title_full |
Search for fourth sound propagation in supersolid ⁴He |
| title_fullStr |
Search for fourth sound propagation in supersolid ⁴He |
| title_full_unstemmed |
Search for fourth sound propagation in supersolid ⁴He |
| title_sort |
search for fourth sound propagation in supersolid ⁴he |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2008 |
| topic_facet |
Твердый гелий |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/116907 |
| citation_txt |
Search for fourth sound propagation in supersolid ⁴He / Y. Aoki, X. Lin, H. Kojima // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 414–426. — Бібліогр.: 58 назв. — англ. |
| series |
Физика низких температур |
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| first_indexed |
2023-10-18T20:28:34Z |
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2023-10-18T20:28:34Z |
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