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Preliminary Heat Capacity and Vapor Pressure Measurements of 2D 4He on ZYX Graphite

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Abstract

We report preliminary heat capacity and vapor pressure measurements of the first and second layers of 4He adsorbed on ZYX graphite. ZYX is known to have much better crystallinity than Grafoil, the most commonly-used exfoliated graphite substrate, such as a ten-times larger platelet size. This allows us to distinguish different phases in 2D 4He much more clearly and may provide qualitatively different insights into this system. We found a significantly asymmetric density-dependence of the heat-capacity peak associated with the \(\sqrt{3}\times\sqrt{3}\) phase formation comparing with that obtained with Grafoil. The 2nd-layer promotion density is determined as 11.8±0.3 nm−2 from the heat-capacity measurement of low density samples in the 2nd layer and vapor pressure measurement.

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Acknowledgements

This work was financially supported by Grant-in-Aid for Scientific Research (A) (No. 2222440042) and on Priority Areas (No. 17071002) from MEXT, Japan. S.N. acknowledges support from the Fuuju-kai Fellowship. S.N. and K.M. also acknowledge support from the Global COE Program “the Physical Sciences Frontier”, MEXT, Japan.

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Authors and Affiliations

  1. Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan

    S. Nakamura, K. Matsui, T. Matsui & Hiroshi Fukuyama

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  1. S. Nakamura
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  2. K. Matsui
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  3. T. Matsui
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  4. Hiroshi Fukuyama
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Correspondence to S. Nakamura.

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Nakamura, S., Matsui, K., Matsui, T. et al. Preliminary Heat Capacity and Vapor Pressure Measurements of 2D 4He on ZYX Graphite. J Low Temp Phys 171, 711–717 (2013). https://doi.org/10.1007/s10909-012-0847-5

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  • DOI: https://doi.org/10.1007/s10909-012-0847-5

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