Intercalated Cu+ ion dynamics in the two-dimensional layered compound Cu0.33TiSe2

Shunsuke Kitou, Takumi Hasegawa, Akitoshi Nakano, Naoyuki Katayama, Satoshi Tsutsui, and Hiroshi Sawa
Phys. Rev. B 101, 094108 – Published 31 March 2020
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Abstract

Cu+ ion behavior is one of the heavily discussed topics in physical and material fields because of its unclear behavior and high potential in materials application. To provide a breakthrough in this field, comprehensive research that connects the real space and the reciprocal lattice (momentum) space is effective. Here, we investigated the Cu+ ion behavior in two-dimensional layered system Cu0.33TiSe2, which shows the Cu+ disorder-order phase transition at 200 K. Inelastic x-ray scattering revealed a large change of the Cu+ ion dynamics at the phase transition. It is expected that the complex interactions are involved in the behavior of Cu+ ions intercalated in the negatively charged TiSe2 layers by charge transfer. However, Monte Carlo simulations using a simple combination of repulsive forces between Cu+ ions well reproduce the characteristic temperature dependence of the anisotropic diffuse scattering. These insights provide a unified understanding in controlling the intercalated system.

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  • Received 8 November 2019
  • Revised 8 March 2020
  • Accepted 10 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.094108

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Shunsuke Kitou1,*, Takumi Hasegawa2, Akitoshi Nakano3, Naoyuki Katayama1, Satoshi Tsutsui4, and Hiroshi Sawa1,†

  • 1Department of Applied Physics, Nagoya University, Nagoya 464–8603, Japan
  • 2Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739–8521, Japan
  • 3Department of Physics, Nagoya University, Nagoya 464–8602, Japan
  • 4Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Hyogo 679–5198, Japan

  • *kitou.shunsuke@h.mbox.nagoya-u.ac.jp
  • hiroshi.sawa@cc.nagoya-u.ac.jp

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Issue

Vol. 101, Iss. 9 — 1 March 2020

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