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Local-moment formation and metal-nonmetal transition in Ca1−x Y x VO3 and Ca1−x Y x TiO3

  • Strongly Correlated Electron Systems
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Abstract

Electron-doped metallic states of Ca1−x Y x VO3 and Ca1−x Y x TiO3 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 T 2 term of resistivity. The effective moment reaches ∼ 0.5 µB/molecule in Ca1−x Y x VO3 and also in Ca1−x Y x TiO3 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−x Y x VO3, 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.

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Authors and Affiliations

  1. Faculty of Science, Ibaraki University, Mito, 310-8512, Ibaraki, Japan

    Y Nishihara

  2. National Institute of Advanced Industrial Science and Technology, 305-8568, Tsukuba, Ibaraki, Japan

    H Kawanaka & H Bando

Authors
  1. Y Nishihara
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  2. H Kawanaka
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  3. H Bando
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Nishihara, Y., Kawanaka, H. & Bando, H. Local-moment formation and metal-nonmetal transition in Ca1−x Y x VO3 and Ca1−x Y x TiO3 . Pramana - J Phys 58, 737–742 (2002). https://doi.org/10.1007/s12043-002-0164-7

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  • DOI: https://doi.org/10.1007/s12043-002-0164-7

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