Abstract
The heat capacity of4He films adsorbed on Grafoil has been reexamined with emphasis on its correlation with our previous third-sound observations. Each of the heat capacity curves shows an inflection point, which shifts to lower temperature as the film gets thinner. The temperature of this inflection point is higher than the onset temperature determined by the third-sound measurements for any given thickness. This result can be explained within the framework of recent theoretical studies based on the Kosterlitz-Thouless theory. In addition, the van der Waals constant α is evaluated from the data on vapor pressure versus temperature, and it is estimated to be 201±30 me V Å3 (=50.1±7.5 K layer3) in good agreement with a recent theoretical value derived by Vidali et al. Moreover, this evaluation confirms our previous conclusion deduced from third-sound observations.
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Yuyama, J., Watanabe, T. Superfluid transition of4He films adsorbed on graphite substrates: A calorimetric study in connection with third-sound observations. J Low Temp Phys 48, 331–348 (1982). https://doi.org/10.1007/BF00681577
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DOI: https://doi.org/10.1007/BF00681577