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    Static density response function studied by inelastic x-ray scattering: Friedel oscillations in solid and liquid Li

    Toru Hagiya1,*, Kazuhiro Matsuda1,†, Nozomu Hiraoka2, Yukio Kajihara3, Koji Kimura4, and Masanori Inui3

    • 1Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
    • 2National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
    • 3School of Integrated Arts and Sciences, Hiroshima University, Higashi Hiroshima 739-8521, Japan
    • 4Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan

    • *Present address: Metal Powder Technology Department, Sanyo Special Steel Co., Ltd., Himeji, Hyogo 672-8677, Japan.
    • †Present address: Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan.
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    Phys. Rev. B 102, 054208 – Published 21 August, 2020

    DOI: https://doi.org/10.1103/PhysRevB.102.054208

    Abstract

    We performed inelastic x-ray scattering experiments on solid and liquid Li to determine the static density response function χ(q,0), where q is wave vector. The experimentally determined χ(q,0) allows meaningful comparison of the response function with that of the electron gas model; χ(q,0) exhibits the 2kF singularity predicted in the electron gas model. The screening electron density induced by a positive point charge is calculated, and it shows Friedel oscillations both in solid and liquid Li. Moreover, we found that the Friedel oscillations become weak upon melting.

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    Phys. Rev. B 102, 054208– Published 21 August, 2020
    • Received 11 October 2019
    • Revised 10 July 2020
    • Accepted 5 August 2020
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