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タイトル: Ultrasound study of the solid-liquid transition and solid-liquid interface of 4He in aerogels
著者: Matsumoto, Koichi link image link image
Tsuboya, Hiroyuki
Yoshino, Keiichi
Abe, Satoshi link image link image
Tsujii, Hiroyuki link image link image
Suzuki, Haruhiko link image
松本, 宏一
阿部, 聡
辻井, 宏之
鈴木, 治彦
発行日: 2009年 3月
出版社(者): The Physical Society of Japan = 日本物理学会
雑誌名: Journal of the Physical Society of Japan
ISSN: 0031-9015
巻: 78
号: 3
開始ページ: 346011
終了ページ: 346017
キーワード: 4He
Aerogel
Crystallization
Porous media
Ultrasound
抄録: 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 elevated 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..
DOI: 10.1143/JPSJ.78.034601
URI: http://hdl.handle.net/2297/17353
資料種別: Journal Article
版表示: author
出現コレクション:1.査読済論文(理)

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