Ultrasound measurements of 4He confined in a nano-porous glass

Toshiaki Kobayashi, Junko Taniguchi, Ayanori Saito, Satoshi Fukazawa, Masaru Suzuki, Keiya Shirahama

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have carried out ultrasound measurements for 4He confined in a nano-porous glass, Gelsil. The sound velocity of Gelsil glass in a vacuum is determined by the two-level system (TLS) contribution. Regardless of whether 4He in the pore is liquid or solid, there exists an additional sound velocity change due to the relaxation of ultrasound stresses by a thermal activation mechanism. It was found that the different heat treatment of Gelsil glass affects both this relaxation and the superfluidity of 4He in the pore.

Original languageEnglish
Article number084601
JournalJournal of the Physical Society of Japan
Volume79
Issue number8
DOIs
Publication statusPublished - 2010 Aug 1

Keywords

  • He
  • Nano-porous media
  • Superfluidity
  • Two-level system
  • Ultrasound

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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