Ultrasound study of the solid-liquid transition and solid-liquid interface of 4He in aerogels

フォーマット:

論文

責任表示:

Matsumoto, Koichi ; Tsuboya, Hiroyuki ; Yoshino, Keiichi ; Abe, Satoshi ; Tsujii, Hiroyuki ; Suzuki, Haruhiko

言語:

英語

出版情報:

The Physical Society of Japan = 日本物理学会, 2009-03-01

著者名:

Matsumoto, Koichi

Tsuboya, Hiroyuki

Yoshino, Keiichi

Abe, Satoshi

Tsujii, Hiroyuki

Suzuki, Haruhiko

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掲載情報:

Journal of the Physical Society of Japan

ISSN:

0031-9015      

巻:

78

通号:

3

開始ページ:

346011

終了ページ:

346017

バージョン:

author

概要:

金沢大学理工研究域数物科学系<br />The freezing and melting of 4He in various aerogels with porosities ranging from 92 to 97% were studied using longitudinal ultrasound. The freezing pressure, detected from changes in velocity and attenuation, was e … levated compared with that of the bulk by about 0.3 MPa, and showed a weak dependence on aerogel porosity. Inside the aerogels, there was a liquid phase, a solid phase or a coexisting state depending on temperature and pressure of the sample. We report the measurement of the transmission of sound through the solid-liquid interface in aerogel for the first time, which was independent of temperature and unaffected by a small addition of 3He, unlike that at the bulk interface. This indicates that sound attenuation at the interface is due to the disorder, originating from silica strands. Small amounts of 3He in the solid significantly decreased attenuation, because the resultant pinning of dislocations by 3He suppressed phonon scattering, as is observed in bulk solid 4He. © 2009 The Physical Society of Japan.. 続きを見る

URL:

http://hdl.handle.net/2297/17353