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Journal of Low Temperature Physics

, Volume 148, Issue 5–6, pp 791–795 | Cite as

Comparison between Torsional Oscillator and Ultrasonic Measurements of 4He Confined in Nano-Porous Media

  • J. Taniguchi
  • H. Ichida
  • Y. Aoki
  • S. Fukazawa
  • M. Hieda
  • M. Suzuki
Article

Abstract

We have performed torsional oscillator and ultrasonic measurements for 4He confined in 2D nano-porous substrate, hectorite. For 4He films, the resonance frequency of the torsional oscillator increases rapidly just below a superfluid transition temperature (T C ), and then becomes constant at the lower temperature. In contrast, the sound velocity below T C increases monotonically with decreasing temperature. For liquid 4He the sound velocity has a small bend at T b of about 0.9 K. Its increase below T b is enhanced as the pressure is increased.

Keywords

Sound Velocity Areal Density Torsional Oscillator Ultrasonic Measurement Solid Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • J. Taniguchi
    • 1
  • H. Ichida
    • 1
  • Y. Aoki
    • 1
  • S. Fukazawa
    • 1
  • M. Hieda
    • 2
  • M. Suzuki
    • 1
  1. 1.Department of Applied Physics and ChemistryUniversity of Electro-CommunicationsTokyoJapan
  2. 2.Department of PhysicsNagoya UniversityNagoyaJapan

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