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

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

doi:10.1143/JPSJ.79.084601

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

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

4 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 language	English
Article number	084601
Journal	Journal of the Physical Society of Japan
Volume	79
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.79.084601
Publication status	Published - 2010 Aug

Keywords

He
Nano-porous media
Superfluidity
Two-level system
Ultrasound

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.79.084601

Cite this

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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.",

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AU - Kobayashi, Toshiaki

AU - Taniguchi, Junko

AU - Saito, Ayanori

AU - Fukazawa, Satoshi

AU - Suzuki, Masaru

AU - Shirahama, Keiya

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AB - 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.

KW - He

KW - Nano-porous media

KW - Superfluidity

KW - Two-level system

KW - Ultrasound

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