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Structural Study of Adsorbed Helium Films: New Approach with Synchrotron Radiation X-rays

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Abstract

A few atomic layers of helium adsorbed on graphite have been attracting much attention as one of the ideal quantum systems in two dimension. Although previous reports on neutron diffraction have shown fundamental structural information in these systems, there still remain many open questions. Here, we propose surface crystal truncation rod (CTR) scatterings using synchrotron radiation X-rays as a promising method to reveal surface and interface structures of helium films on graphite at temperatures below 2 K, based on the preliminary experimental results on a monolayer of \(^4\)He on a thin graphite. Our estimation on heat generation by X-ray irradiations also suggests that CTR scatterings are applicable to even at system temperatures near 100 mK.

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Acknowledgements

We thank Dr. Mototada Kobayashi for providing HOPG samples, and Prof. Gaku Motoyama, Prof. Takashi Nishioka and Prof. Ryuji Nomura for helpful discussions of the refrigerator design. This work was partly supported by JSPS KAKENHI Grant Numbers JP18H01170, JP18H03479, JP20H05621, and a special research grant of University of Hyogo. J.U. was supported by JSPS through MERIT program and JSPS Fellows (JP20J12304). The surface X-ray scattering measurements were performed using BL13XU, SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposal No. 2020A0599, 2020A2045, 2020A2137, 2021A1142, 2021A2070).

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Authors and Affiliations

  1. Graduate School of Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Ako, Hyogo, 678-1297, Japan

    Akira Yamaguchi, Atsuki Kumashita, Yu Yamane & Akihiko Sumiyama

  2. Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan

    Hiroo Tajiri, Jun Usami & Yoshiharu Sakurai

  3. Cryogenic Research Center, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

    Jun Usami & Hiroshi Fukuyama

  4. Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo, 182-8585, Japan

    Masaru Suzuki

  5. Institute of Physics, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan

    Tomoki Minoguchi

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  1. Akira Yamaguchi
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  2. Hiroo Tajiri
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  3. Atsuki Kumashita
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  4. Jun Usami
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  9. Yoshiharu Sakurai
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  10. Hiroshi Fukuyama
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Correspondence to Akira Yamaguchi or Hiroo Tajiri.

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Yamaguchi, A., Tajiri, H., Kumashita, A. et al. Structural Study of Adsorbed Helium Films: New Approach with Synchrotron Radiation X-rays. J Low Temp Phys 208, 441–448 (2022). https://doi.org/10.1007/s10909-021-02652-1

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