Mutual interactions between objects oscillating in isotopically pure superfluid ⁴He in the T → 0 limit
We report the results of experiments to explore interactions between physically separated oscillating objects in isotopically pure superfluid ⁴He at T ∼ 10 mK. The investigations focused mainly on 32 kHz quartz tuning forks, but also consider a nearby 1 kHz oscillating grid. The low-drive linewidt...
Збережено в:
| Дата: | 2012 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2012
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| Назва видання: | Физика низких температур |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/117921 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Mutual interactions between objects oscillating in isotopically pure superfluid ⁴He in the T → 0 limit / D. Garg, V.B. Efimov, M. Giltrow, P.V.E. McClintock, L. Skrbek // Физика низких температур. — 2012. — Т. 38, № 11. — С. 1300–1305. — Бібліогр.: 31 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | We report the results of experiments to explore interactions between physically separated oscillating objects
in isotopically pure superfluid ⁴He at T ∼ 10 mK. The investigations focused mainly on 32 kHz quartz tuning
forks, but also consider a nearby 1 kHz oscillating grid. The low-drive linewidth (LDL) and resonant frequency
fd of a detector fork were monitored while the maximum velocity of a transmitter fork, separated from the detector
by a few mm, was varied over a wide range. Clear evidence was found for mutual interactions between the
two forks, and for the influence of the grid on the forks. Monitoring the detector's LDL and fd provides evidence
for a generator critical velocity in the range 0.3 < vc₁ <1.0 cm/s for onset of the detector responses, in addition to
a second critical velocity vc₂ ∼ 13 cm/s probably corresponding to the production of quantum turbulence at the
generator. The results are discussed, but are not yet fully understood. |
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