Manipulating the ferromagnetism in narrow-bandwidth Pr1-xCaxMnO3 (0 ≤ x ≤ 0.6) by means of the Mn-Ru t2g ferromagnetic super-exchanges

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[1] Wang, Y.L.
[2] Liu, M.F.
[3] Xie, Y.L.
[4] Yan, Z.B.
[5] Dong, S.
[6] 1,Liu, J.-M.
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| 1600年 / American Institute of Physics Inc.卷 / 118期
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The concurrent ferromagnetic and metal-insulator transitions via the double-exchange route and electronic phase separation scenario represent the core ingredients of the physics of manganites. In this work; a Ca2+ and Ru4+ co-substitution of Pr3+ and Mn3+ in narrow-bandwidth and insulating PrMnO3; namely; Pr1-xCaxMn1-xRuxO3; (PCMRO; x; ≤; 0.6); is carried out in order to investigate an alternative approach to effectively manipulate the ferromagnetism of PrMnO3-based manganites. It is revealed that PCMRO over the whole substitution range is homogeneous solid solution with increased lattice distortion. The preference of Ru4+ valence state and the absence of Mn4+ valence state disable the Mn3+-Mn4+ eg-orbital double-exchange; and the random occupation of Ru4+ in the lattice excludes the charge ordering and electronic phase separation. While all these consequences should favor antiferromagnetic insulating states; nevertheless; a high-temperature ferromagnetic transition is triggered by the co-substitution and the magnetization can reach up to ∼1.0 μB/f.u. at x ∼ 0.2-0.3; much bigger than the moment (B/f.u.) of Pr1-xCaxMnO3 in the weak ferromagnetic insulator state. It is suggested that this strong ferromagnetism is substantially ascribed to the Mn3+-Ru4+ t2g-orbital ferromagnetic super-exchange; and a simple geometric network illustration of the magnetism and electrical transport is presented. © 2015 AIP Publishing LLC;
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  • [1] Manipulating the ferromagnetism in narrow-bandwidth Pr1-xCaxMnO3 (0 ≤ x ≤ 0.6) by means of the Mn-Ru t2g ferromagnetic super-exchanges
    Wang, Y. L.
    Liu, M. F.
    Xie, Y. L.
    Yan, Z. B.
    Dong, S.
    Liu, J. -M.
    JOURNAL OF APPLIED PHYSICS, 2015, 118 (12)
  • [2] Unusual ferromagnetism enhancement in ferromagnetically optimal manganite La0.7-yCa0.3+yMn1-yRuyO3 (0≤y<0.3): the role of Mn-Ru t2g super-exchange
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    Xie, Y. L.
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    SCIENTIFIC REPORTS, 2015, 4
  • [3] Unusual ferromagnetism enhancement in ferromagnetically optimal manganite La0.7−yCa0.3+yMn1−yRuyO3 (0≤y<0.3): the role of Mn-Ru t2g super-exchange
    M. F. Liu
    Z. Z. Du
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