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Vibrating wire measurements in superfluid He-3 at the melting curve down to 0.53 mK.

Research output: Contribution to journalJournal article

Published

  • Igor A. Todoshchenko
  • Harry Alles
  • A. Babkin
  • Alexander Y. Parshin
  • Viktor Tsepelin
Journal publication date03/2002
JournalJournal of Low Temperature Physics
Journal number5-6
Volume126
Number of pages7
Pages1449-1455
Original languageEnglish

Abstract

Measurements of the vibrating wire spectrum have been carried out in superfluid He-3 along the melting curve down to 0.53mK. We have observed that at temperatures below 0.3 T-c, the width of the mechanical resonance of the wire decreases exponentially with 1/T, indicating the ballistic regime of collisions with quasiparticles, The value of the superfluid energy gap was found to be (1.99+/-0.05) T-c, in good agreement with the values obtained from heat capacity measurements. The vibrating wire was thereby calibrated for further experiments at temperatures below 0.5 mK, where the sensitivity of the melting curve thermometry becomes rather poor.