Torsional oscillator experiment on superfluid 4He confined in a porous alumina nanopore array

S. Murakawa, R. Higashino, K. Yoshimura, Y. Chikazawa, Takahisa Tanaka, K. Kuriyama, K. Honda, Y. Shibayama, Keiya Shirahama

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Abstract

We studied superfluidity of liquid 4He confined in an array of well-characterized straight nanopores of porous alumina (PA). The PA plate sample of 45 nm pore size is set in an annular flow channel and the superflow is detected by torsional oscillator (TO) technique. Superfluid transition T c in the nanopores is suppressed by 3.5 mK from the bulk λ point. Tc is consistent with the temperature at which the healing length is equal to the pore radius. We have observed many anti-crossing anomalies in the TO frequency associated with dissipation peaks, which are attributed to the coupling to second sound resonances.

Original languageEnglish
Article number012053
JournalJournal of Physics: Conference Series
Volume400
Issue numberPART 1
DOIs
Publication statusPublished - 2012

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aluminum oxides
oscillators
porosity
annular flow
superfluidity
healing
dissipation
anomalies
radii
acoustics
liquids
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Torsional oscillator experiment on superfluid 4He confined in a porous alumina nanopore array. / Murakawa, S.; Higashino, R.; Yoshimura, K.; Chikazawa, Y.; Tanaka, Takahisa; Kuriyama, K.; Honda, K.; Shibayama, Y.; Shirahama, Keiya.

In: Journal of Physics: Conference Series, Vol. 400, No. PART 1, 012053, 2012.

Research output: Contribution to journalArticle

Murakawa, S, Higashino, R, Yoshimura, K, Chikazawa, Y, Tanaka, T, Kuriyama, K, Honda, K, Shibayama, Y & Shirahama, K 2012, 'Torsional oscillator experiment on superfluid 4He confined in a porous alumina nanopore array', Journal of Physics: Conference Series, vol. 400, no. PART 1, 012053. https://doi.org/10.1088/1742-6596/400/1/012053
Murakawa, S. ; Higashino, R. ; Yoshimura, K. ; Chikazawa, Y. ; Tanaka, Takahisa ; Kuriyama, K. ; Honda, K. ; Shibayama, Y. ; Shirahama, Keiya. / Torsional oscillator experiment on superfluid 4He confined in a porous alumina nanopore array. In: Journal of Physics: Conference Series. 2012 ; Vol. 400, No. PART 1.
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