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Third-sound resonance and thermal resistance in unsaturated helium films

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Abstract

We have obtained a thermodynamic state of thin helium films which permits precision measurements of their properties. Third-sound resonances indicate a transition in the superfluid density of these films. This transition is accompanied by an exponential rise in the thermal resistance of the helium film which indicates the formation of high-energy excitations of 0.08 eV. The dissipation at resonance indicates that thermodynamic fluctuations are the principal mode of third-sound damping.

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Authors and Affiliations

  1. Department of Physics and Materials Research Laboratory, University of Illinois, Urbana, Illinois

    B. Ratnam & J. Mochel

Authors
  1. B. Ratnam
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  2. J. Mochel
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Additional information

A revised approach to the data in this paper appeared inPhysical Review Letters, Vol. 25, No. 11, page 711ff, September 14, 1970.

This research was supported in part by the Advanced Research Projects Agency under Contract SD-131 and in part by the Alfred P. Sloan Foundation.

Alfred P. Sloan Fellow.

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Ratnam, B., Mochel, J. Third-sound resonance and thermal resistance in unsaturated helium films. J Low Temp Phys 3, 239–246 (1970). https://doi.org/10.1007/BF00628147

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  • DOI: https://doi.org/10.1007/BF00628147

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