Charge Ordering in the Geometrically Frustrated Spinel AlV<sub>2</sub>O<sub>4</sub>

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  • Matsuno Ken-ichiro
    Department of Advanced Materials Science, University of Tokyo, Tokyo 113-8656
  • Katsufuji Takuro
    Department of Advanced Materials Science, University of Tokyo, Tokyo 113-8656 Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation
  • Mori Shigeo
    Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551
  • Moritomo Yutaka
    Center for Integrated Research in Science and Engineering (CIRSE), Nagoya University, Nagoya 464-8601
  • Machida Akihiko
    Department of Crystalline Materials Science, Nagoya University, Nagoya 464-8603
  • Nishibori Eiji
    Department of Applied Physics, Nagoya University, Nagoya 464-8603
  • Takata Masaki
    Department of Applied Physics, Nagoya University, Nagoya 464-8603
  • Sakata Makoto
    Department of Applied Physics, Nagoya University, Nagoya 464-8603
  • Yamamoto Naoki
    Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551
  • Takagi Hidenori
    Department of Advanced Materials Science, University of Tokyo, Tokyo 113-8656 Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation

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  • Charge Ordering in the Geometrically Frustrated Spinel AlV2O4.

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We have found that spinel AlV2O4 shows a phase transition at ∼700 K with anomalies of transport and magnetic properties. It is clarified that this corresponds to a charge-ordering transition, where the V2.5+ ions are separated into three V2.5-δ ions and one V2.5+3δ ion. This three-one type of charge ordering, which is coupled with rhombohedral distortion along the (111) axis, reduces the high degeneracy of ground states inherent in this spinel structure, and thus can be understood in terms of “charge frustration.”

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