• Local-moment formation and metal-nonmetal transition in Ca1−xYxVO3 and Ca1−xYxTiO3

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    • Keywords


      Metal-nonmetal phase boundary; local moment formation; Ca1−xYxVO3

    • Abstract


      Electron-doped metallic states of Ca1−xYxVO3 and Ca1−xYxTiO3 change into non-metallic states around x∼0.4 and 0.6, respectively. The residual resistivity in the metallic states increases with increasing effective magnetic moment or coefficient of T2 term of resistivity. The effective moment reaches ∼ 0.5 µB/molecule in Ca1−xYxVO3 and also in Ca1−xYxTiO3 near the metal-nonmetal phase boundary. In these metallic states. ∼ 10% of 3d atoms seem to have large localized magnetic moments. In electron-doped metallic sample of Ca1−xYxVO3, the temperature dependence of resistance shows no resistance-minimum. However, weak negative magneto-resistance is observed for the sample with x=0.2 up to 50 Tesla at 4.2 K.

    • Author Affiliations


      Y Nishihara1 H Kawanaka2 H Bando2

      1. Faculty of Science, Ibaraki University, Mito, Ibaraki - 310-8512, Japan
      2. National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki - 305-8568, Japan
    • Dates

  • Pramana – Journal of Physics | News

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