Ultrasonic study of superfluidity of 4He in a nanoporous glass

T. Kobayashi, S. Fukazawa, J. Taniguchi, M. Suzuki, K. Shirahama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Recently, Yamamoto et al. have carried out torsional oscillator measurements for 4He filled in a nanoporous glass containing pores 2.5 nm in diameter (Gelsil), and reported a large suppression of superfluidity at high pressures. In order to study the mechanism of the superfluid suppression, we have carried out ultrasonic measurements for 4He filled in the same nanoporous glass. We have clearly observed an increase in the sound velocity due to decoupling of the superfluid component. At zero pressure, the superfluid transition temperature TC is suppressed to 1.4 K from the bulk lambda point, 2.17 K. The pressure dependence of TC and the temperature dependence of the superfluid fraction are very different from those reported by Yamamoto et al.

Original languageEnglish
Title of host publicationLOW TEMPERATURE PHYSICS
Subtitle of host publication24th International Conference on Low Temperature Physics - LT24
Pages277-278
Number of pages2
DOIs
Publication statusPublished - 2006 Dec 1
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: 2006 Aug 102006 Oct 17

Publication series

NameAIP Conference Proceedings
Volume850
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
CountryUnited States
CityOrlando, FL
Period06/8/1006/10/17

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Keywords

  • Porous glass
  • Superfluid He
  • Ultrasound

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kobayashi, T., Fukazawa, S., Taniguchi, J., Suzuki, M., & Shirahama, K. (2006). Ultrasonic study of superfluidity of 4He in a nanoporous glass. In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 (pp. 277-278). (AIP Conference Proceedings; Vol. 850). https://doi.org/10.1063/1.2354699