Inelastic X-ray Scattering Study on Plasmon Dispersion in Liquid Cs

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  • Koji Kimura
    Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Kazuhiro Matsuda
    Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Nozomu Hiraoka
    National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
  • Yukio Kajihara
    Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
  • Tetsu Miyatake
    Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Yotaro Ishiguro
    Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Toru Hagiya
    Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Masanori Inui
    Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
  • Makoto Yao
    Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

Description

We study the plasmon dispersion of liquid Cs using inelastic X-ray scattering techniques in the range of momentum transfer, 0.32 ≤ q ≤ 0.55 A−1. While the previous electron energy loss spectroscopy experiments reported that the plasmon energy in solid Cs decreases with increasing q below q = 0.5 A−1, we find that the plasmon energy in liquid Cs tends to increase with q in the range 0.32 ≤ q ≤ 0.55 A−1. We determine the slope of the dispersion normalized by the plasmon energy at q = 0, by fitting the linear function around this q range. The slope for liquid Cs is 0.10 ± 0.12 A, whereas that for solid Cs is −0.11 ± 0.07 A. We qualitatively interpret that the observed variation in the dispersion relation upon melting is attributable to the reduction of the band structure effect (the effect of the s–d transitions). In addition, the plasmon dispersion of Cs is compared with that of Rb for both the solid and the liquid state. Although the dispersion curves of Rb and Cs are in appearance qualitatively different ...

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