Ultrasound study of the solid-liquid transition and solid-liquid interface of 4He in aerogels
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概要
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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..
- 社団法人日本物理学会の論文
- 2009-03-15
著者
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Matsumoto Koichi
Department of Medicine, Division of Nephrology and Endocrinology, Nihon University School of Medicin
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Abe Satoshi
Departments Of Cardiovascular Respiratory And Metabolic Medicine Kagoshima University
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SUZUKI Haruhiko
Department of Immunology, Nagoya University Graduate School of Medicine
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Tsujii Hiroyuki
Department Of Clinico-laboratory Diagnostics Nara Medical University
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Matsumoto Koichi
Department Of Physics Kanazawa University
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Yoshino Keiichi
Department Of Physics Kanazawa University:(present Office)nippon Electric Glass Co. Ltd.
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TSUBOYA Hiroyuki
Department of Physics, Kanazawa University
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Abe Satoshi
Department Of Gastroenterology Juntendo University School Of Medicine
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Abe Satoshi
Department Of Physics Kanazawa University
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Suzuki Haruhiko
Department Of Electrical Engineering Fukushima National College Of Technology
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Matsumoto Koichi
Department Of Applied Physics Tokyo Institute Of Technology
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Abe Satoshi
Department Of Electrical And Communication Engineering Graduate School Of Engineering Tohoku Univers
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Tsuboya Hiroyuki
Department Of Physics Kanazawa University:(present Office)kyowa Electronic Instruments Co. Ltd.
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Abe Satoshi
Department of Applied Chemistry, Faculty of Engineering, Yamagata University
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