Journal of Low Temperature Physics

, Volume 103, Issue 5–6, pp 265–272 | Cite as

High frequency acoustic measurements in liquid3He near the transition temperature

  • Y. Lee
  • P. J. Hamot
  • D. T. Sprague
  • T. M. Haard
  • J. B. Kycia
  • M. R. Rand
  • M. W. Meisel
  • W. P. Halperin
Rapid Communication

Abstract

We have made accurate measurements of the phase velocity in liquid3He at 0.6 bar near Tc using a path length modulation technique. The frequency used in this measurement (113 MHz) is much higher than any of the collective mode frequencies and well above the threshold for pair-breaking, ω≫Δ and ω > 2Δ0. We have observed a sharp but small linear increase in the phase velocity below Tc and a small decrease from the expected behavior in the normal fluid region very close to the transition temperature.

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Y. Lee
    • 1
  • P. J. Hamot
    • 1
  • D. T. Sprague
    • 1
  • T. M. Haard
    • 1
  • J. B. Kycia
    • 1
  • M. R. Rand
    • 1
  • M. W. Meisel
    • 1
  • W. P. Halperin
    • 1
  1. 1.Department of Physics and AstronomyNorthwestern UniversityEvanstonUSA
  2. 2.Department of PhysicsUniversity of FloridaGainesvilleUSA

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