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

Satoshi Murakawa, R. Higashino, K. Yoshimura, Y. Chikazawa, T. Tanaka, K. Kuriyama, K. Honda, Y. Shibayama, K. Shirahama

Research output: Contribution to journalConference article

1 Citation (Scopus)

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 Jan 1
Event26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China
Duration: 2011 Aug 102011 Aug 17

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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, 400(PART 1), [012053]. https://doi.org/10.1088/1742-6596/400/1/012053