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Influences of Ru-doping on the magnetic properties of Ca0.85Pr0.15Mn1−x Ru x O3

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Abstract

CaMnO3 is an antiferromagnet, in which the super-exchange interaction taking place between Mn4+ ions plays an important role. The doping of a small amount of 15% Pr into the Ca site, Ca0.85Pr0.15MnO3, leads to the appearance of Mn3+ ions, and introduces the ferromagnetic (FM) double-exchange interaction between Mn3+ and Mn4+ ions, which is dominant in a narrow temperature range of 90 ∼ 115 K. The FM interaction becomes strong for Ca0.85Pr0.15MnO3 doped with 4 and 8% Ru into the Mn site (i.e., Ca0.85Pr0.15Mn1−x Ru x O3 with x = 0.04 and 0.08). The Curie temperature obtained for x = 0.04 and 0.08 are about 135 and 180 K, respectively. While the FM interaction in the former is dominant due to Mn3+-Mn4+ exchange pairs, the latter has the contribution of Ru ions. This results in remarkable differences in the features of their FM-paramagnetic phase transitions and their coercive fields H c .

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Authors and Affiliations

  1. BK-21 Program and Department of Physics, Chungbuk National University, Cheongju, 361-763, Korea

    T. L. Phan, Y. D. Zhang & S. C. Yu

  2. Department of Physics, College of Science, Vietnam National University, Hanoi, Vietnam

    P. Q. Thanh & P. D. H. Yen

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  1. T. L. Phan
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  2. Y. D. Zhang
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  3. S. C. Yu
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  4. P. Q. Thanh
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  5. P. D. H. Yen
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Correspondence to S. C. Yu.

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Phan, T.L., Zhang, Y.D., Yu, S.C. et al. Influences of Ru-doping on the magnetic properties of Ca0.85Pr0.15Mn1−x Ru x O3 . Journal of the Korean Physical Society 61, 1568–1572 (2012). https://doi.org/10.3938/jkps.61.1568

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  • DOI: https://doi.org/10.3938/jkps.61.1568

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