Journal of Low Temperature Physics

, Volume 25, Issue 5–6, pp 793–805 | Cite as

Apparent new phase of monolayer3He and4He films adsorbed on Grafoil as determined from heat capacity measurements

  • S. V. Hering
  • S. W. Van Sciver
  • O. E. Vilches
Article
Received:

Abstract

Heat capacity measurements in monolayer3He and4He films adsorbed on Grafoil at densities higher than the one corresponding to the substrate lattice registered phase show a series of sharp, narrow peaks at 1 K for densities between 0.072 and 0.077Å−2. The exact nature of the transition cannot be determined from this measurement alone, but several possibilities are discussed. It has been determined that the melting line of two-dimensional solid films starts atn=0.078Å−2 for both isotopes. Extensive heat capacity measurements at and above this density are presented for3He, and some new measurements for4He are shown to complement measurements reported elsewhere. The solid3He measurements are compared to predictions of recent models for melting in two dimensions.

Keywords

Heat Capacity Magnetic Material Exact Nature Recent Model Capacity Measurement 
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Copyright information

© Plenum Publishing Corporation 1976

Authors and Affiliations

  • S. V. Hering
    • 1
  • S. W. Van Sciver
    • 1
  • O. E. Vilches
    • 1
  1. 1.Department of PhysicsUniversity of WashingtonSeattle

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