スピネル化合物AlV2O4における電荷秩序構造と不純物置換効果

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タイトル別名
  • Charge Ordered Structure and its Impurity Doping Effect in Spinel AlV2O4
  • サイキン ノ ケンキュウ カラ スピネル カゴウブツ AlV2O4 ニ オケル デンカ チツジョ コウゾウ ト フジュンブツ チカン コウカ

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抄録

The charge ordered (CO) state in spinel A1V2O4, which appears below 700 K, was examined by electron and synchrotron x-ray diffraction experiments. It was found that the CO structure is characterized by the formation of V clusters (heptamers), each of which is consisting of 7 vanadium atoms and is in a spin-singlet state as a total. In addition, it was revealed that the Cr substitution for V in A1V2O4 suppressed the formation of the long-ranged CO structure and induced the charge disordered (CD) state. As a result, the coexisting state between the CO and CD states with the 20-30 nm size was stabilized in A1V2-xCrxO4 with x=0.125.

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