Ultrasound Measurements of 4He Confined in a Nano-porous Glass

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概要

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• 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.

• 2010-08-15

著者

• Kobayashi Toshiaki

  Department Of Applied Physics And Chemistry The University Of Electro-communications

• Taniguchi Junko

  Department Of Applied Physics And Chemistry University Of Electro-communications

• Junko Taniguchi

  Department of Applied Physics and Chemistry, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

• Keiya Shirahama

  Department of Physics, Keio University, Yokohama 223-8522, Japan

• Saito Ayanori

  Department of Applied Physics and Chemistry, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

• Satoshi Fukazawa

  Department of Applied Physics and Chemistry, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

• Masaru Suzuki

  Department of Applied Physics and Chemistry, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan

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