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Theory of Sound Absorption in the Superfluid Phases of 3He

  • P. Wölfle

Abstract

After the discovery of the superfluid phases of 3He,1 the propagation of zero sound was among the first properties to be studied experimentally.2,3 Somewhat unexpectedly, the sound attenuation at frequencies exceeding about 5 MHz was observed to develop a rather narrow peak just below the normal-superfluid transition, growing rapidly as the frequency was increased. It was soon realized by several authors4,5,6 that the sound absorption peak could be understood in the framework of BCS-theory (as applied7 to the new phases of 3He) as being caused by excitations of the pair condensate.

Keywords

Collective Mode Sound Absorption Axial State Sound Attenuation Superfluid Phasis 
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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • P. Wölfle
    • 1
  1. 1.Max-Planck-Institut für Physik und AstrophysikMünchen 40Germany

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