Mutual interactions between objects oscillating in isotopically pure superfluid ⁴He in the T → 0 limit

• Veröffentlicht in: Физика низких температур
• Datum: 2012
• Hauptverfasser: Garg, D., Efimov, V.B., Giltrow, M., McClintock, P.V.E., Skrbek, L.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2012
• Schlagworte: К 75-летию Л.П. Межова-Деглина
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/117921
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: 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.

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.