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Magnetoresistance of lanthanum manganites with activation-type conductivity

  • Order, Disorder, and Phase Transition in Condensed System
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Abstract

The temperature dependence of the resistivity and magnetic moment of La0.85Ba0.15MnO3 and La0.85Sr0.15MnO3 manganite single crystals in magnetic fields up to 90 kOe is investigated. Analysis of the experimental results shows that the magnetoresistance of lanthanum manganites far from the Curie temperature T C can be described quantitatively by the s-d model normally used for ferromagnets and taking into account only the exchange interaction between the spins of charge carriers and magnetic moments. These data also show that the features of lanthanum manganites responsible for colossal magnetoresistance (CMR) are manifested in a narrow temperature interval δT ≈ 20 K near T C. Our results suggest a CMR mechanism analogous to the mechanism of giant magnetoresistance (GMR) observed in Fe/Cr-type multilayers with nanometer layer thickness. The nanostratification observed in lanthanum manganites and required for GMR can be described taking into account the spread in T C in the CMR range δT.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620129, Russia

    M. I. Kurkin, E. A. Neifeld, A. V. Korolev, N. A. Ugryumova, S. A. Gudin & N. N. Gapontseva

Authors
  1. M. I. Kurkin
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  2. E. A. Neifeld
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  3. A. V. Korolev
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  4. N. A. Ugryumova
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  5. S. A. Gudin
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  6. N. N. Gapontseva
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Corresponding author

Correspondence to M. I. Kurkin.

Additional information

Original Russian Text © M.I. Kurkin, E.A. Neifeld, A.V. Korolev, N.A. Ugryumova, S.A. Gudin, N.N. Gapontseva, 2013, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2013, Vol. 143, No. 5, pp. 948–952.

The paper is based on a preliminary report made at the 36th Meeting on Low-Temperature Physics (July 2–6, 2012, St. Petersburg, Russia).

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Kurkin, M.I., Neifeld, E.A., Korolev, A.V. et al. Magnetoresistance of lanthanum manganites with activation-type conductivity. J. Exp. Theor. Phys. 116, 823–827 (2013). https://doi.org/10.1134/S1063776113050075

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  • DOI: https://doi.org/10.1134/S1063776113050075

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