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Heat Capacity of Dilute \(^{3}\)He–\(^{4}\)He Monolayer Films

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Abstract

The heat capacities of a small amount of \(^{3}\)He dissolved in monolayer \(^{4}\)He films are measured to clarify natures of monolayer \(^{4}\)He films. With increasing areal density, the measured heat capacities gradually increase and subsequently gradually decrease. With further increase in areal density, the measured heat capacity rapidly decreases to zero over a very narrow areal density range near that of the \(\sqrt{3}\,\times \,\sqrt{3} \) phase. These slightly complex areal-density variations and dependence on \(^{3}\)He concentration are discussed from the viewpoint of the known properties of \(^{4}\)He films. The behaviors can be explained. However, the expected two-dimensional gas–liquid or gas–solid coexistence is not observed in this study.

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Acknowledgments

All experimental measurements were performed with commonly used equipment at the Cryogenics Division, Research Facility Center for Science and Technology, University of Tsukuba. This research was supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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  1. Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan

    Masashi Morishita

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  1. Masashi Morishita
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Correspondence to Masashi Morishita.

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Morishita, M. Heat Capacity of Dilute \(^{3}\)He–\(^{4}\)He Monolayer Films. J Low Temp Phys 183, 245–250 (2016). https://doi.org/10.1007/s10909-015-1351-5

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  • DOI: https://doi.org/10.1007/s10909-015-1351-5

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