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

Fingerprint

acoustic velocity
glass
porosity
superfluidity
heat treatment
activation
vacuum
liquids

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ultrasound measurements of 4He confined in a nano-porous glass. / Kobayashi, Toshiaki; Taniguchi, Junko; Saito, Ayanori; Fukazawa, Satoshi; Suzuki, Masaru; Shirahama, Keiya.

In: Journal of the Physical Society of Japan, Vol. 79, No. 8, 084601, 08.2010.

Research output: Contribution to journalArticle

Kobayashi, Toshiaki ; Taniguchi, Junko ; Saito, Ayanori ; Fukazawa, Satoshi ; Suzuki, Masaru ; Shirahama, Keiya. / Ultrasound measurements of 4He confined in a nano-porous glass. In: Journal of the Physical Society of Japan. 2010 ; Vol. 79, No. 8.
@article{9d20fc6e8c7142e5bf07c22a80b7088a,
title = "Ultrasound measurements of 4He confined in a nano-porous glass",
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.",
keywords = "He, Nano-porous media, Superfluidity, Two-level system, Ultrasound",
author = "Toshiaki Kobayashi and Junko Taniguchi and Ayanori Saito and Satoshi Fukazawa and Masaru Suzuki and Keiya Shirahama",
year = "2010",
month = "8",
doi = "10.1143/JPSJ.79.084601",
language = "English",
volume = "79",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "8",

}

TY - JOUR

T1 - Ultrasound measurements of 4He confined in a nano-porous glass

AU - Kobayashi, Toshiaki

AU - Taniguchi, Junko

AU - Saito, Ayanori

AU - Fukazawa, Satoshi

AU - Suzuki, Masaru

AU - Shirahama, Keiya

PY - 2010/8

Y1 - 2010/8

N2 - 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.

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

UR - http://www.scopus.com/inward/record.url?scp=77956448032&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956448032&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.79.084601

DO - 10.1143/JPSJ.79.084601

M3 - Article

VL - 79

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 8

M1 - 084601

ER -