Regular-triangle trimer and charge order preserving the Anderson condition in the pyrochlore structure of CsW2O6

Yoshihiko Okamoto (), Haruki Amano, Naoyuki Katayama, Hiroshi Sawa, Kenta Niki, Rikuto Mitoka, Hisatomo Harima, Takumi Hasegawa, Norio Ogita, Yu Tanaka, Masashi Takigawa, Yasunori Yokoyama, Kanji Takehana, Yasutaka Imanaka, Yuto Nakamura, Hideo Kishida and Koshi Takenaka
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Yoshihiko Okamoto: Nagoya University
Haruki Amano: Nagoya University
Naoyuki Katayama: Nagoya University
Hiroshi Sawa: Nagoya University
Kenta Niki: Nagoya University
Rikuto Mitoka: Nagoya University
Hisatomo Harima: Kobe University
Takumi Hasegawa: Graduate School of Integrated Arts and Sciences, Hiroshima University
Norio Ogita: Graduate School of Integrated Arts and Sciences, Hiroshima University
Yu Tanaka: Institute for Solid State Physics, University of Tokyo
Masashi Takigawa: Institute for Solid State Physics, University of Tokyo
Yasunori Yokoyama: Nagoya University
Kanji Takehana: National Institute for Materials Science (NIMS)
Yasutaka Imanaka: National Institute for Materials Science (NIMS)
Yuto Nakamura: Nagoya University
Hideo Kishida: Nagoya University
Koshi Takenaka: Nagoya University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Since the discovery of the Verwey transition in magnetite, transition metal compounds with pyrochlore structures have been intensively studied as a platform for realizing remarkable electronic phase transitions. We report on a phase transition that preserves the cubic symmetry of the β-pyrochlore oxide CsW2O6, where each of W 5d electrons are confined in regular-triangle W3 trimers. This trimer formation represents the self-organization of 5d electrons, which can be resolved into a charge order satisfying the Anderson condition in a nontrivial way, orbital order caused by the distortion of WO6 octahedra, and the formation of a spin-singlet pair in a regular-triangle trimer. An electronic instability due to the unusual three-dimensional nesting of Fermi surfaces and the strong correlations of the 5d electrons characteristic of the pyrochlore oxides are both likely to play important roles in this charge-orbital-spin coupled phenomenon.

Date: 2020
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DOI: 10.1038/s41467-020-16873-7

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