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Dynamical transport behavior in electron-doped manganites La0.4Ca0.6(Mn1−x Ru x )O3

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Abstract

Measurements of the dynamical electrical transport behavior are performed on electron-doped manganites La0.4Ca0.6(Mn1−x Ru x )O3 (x=0 and 0.02). An undoped sample possesses a robust charge-ordered antiferromagnetic ground state, and only a positive resistivity relaxation can be observed. However, a low-temperature negative relaxation behavior arises after inducing a few ferromagnetic orders to the charge-ordered matrix by tiny Ru doping. We assigned this difference to the dynamical competition between ferromagnetic metallic and charge-ordered insulating phases. Consistently, for a doped sample, the crossover from positive to negative resistivity relaxation behavior ensues around T=115 K, which is just below the ferromagnetic Curie temperature.

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Authors and Affiliations

  1. Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China

    C. L. Lu, K. F. Wang, Z. B. Yan & J.-M. Liu

  2. Department of Physics, Wuhan University, Wuhan, 430072, China

    N. Hu

  3. School of Science, Hubei University of Technology, Wuhan, 430068, China

    N. Hu

  4. International Center for Materials Physics, Chinese Academy of Science, Shenyang, 110016, China

    J.-M. Liu

Authors
  1. C. L. Lu
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  2. N. Hu
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  3. K. F. Wang
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  4. Z. B. Yan
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  5. J.-M. Liu
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Correspondence to J.-M. Liu.

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Lu, C.L., Hu, N., Wang, K.F. et al. Dynamical transport behavior in electron-doped manganites La0.4Ca0.6(Mn1−x Ru x )O3 . Appl. Phys. A 100, 1211–1215 (2010). https://doi.org/10.1007/s00339-010-5844-4

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  • DOI: https://doi.org/10.1007/s00339-010-5844-4

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