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Magnetoresistance of La0.67Sr0.33MnO3 epitaxial films grown on a substrate with low lattice mismatch

  • Magnetism and Ferroelectricity
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Abstract

The structure, electrical resistivity, and magnetoresistance of La0.67Sr0.33MnO3 heteroepitaxial films (120-nm thick) practically unstrained by lattice mismatch with the substrate were studied. A strong maximum of negative magnetoresistance of ≈27% (for μ0 H = 4 T) was observed at T ≈360 K. While the magnetoresistance decreased monotonically in magnitude with decreasing temperature, it was still in excess of 2% at 150 K. For T < 250 K, the temperature dependence of the electrical resistivity ρ of La0.67Sr0.33MnO3 films is fitted well by the relation ρ = ρ0 + ρ 1(H)T 2.3, where ρ0 = 1.1×10−4 Ω cm, ρ1(H = 0) = 1.8×10−9 Ω cm/K2.3, and ρ1(μ0 H = 4 T)/ρ1(H = 0) ≈0.96. The temperature dependence of a parameter γ characterizing the extent to which the electrical resistivity of the ferromagnetic phase of La0.67Sr0.33MnO3 films is suppressed by a magnetic field (μ 0 H = 5 T) was determined.

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Authors and Affiliations

  1. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    Yu. A. Boikov & V. A. Danilov

  2. Chalmers Technical University, Göteborg, S-41296, Sweden

    T. Claeson

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  1. Yu. A. Boikov
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  2. T. Claeson
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  3. V. A. Danilov
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__________

Translated from Fizika Tverdogo Tela, Vol. 47, No. 12, 2005, pp. 2189–2194.

Original Russian Text Copyright © 2005 by Bo\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \)kov, Claeson, Danilov.

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Boikov, Y.A., Claeson, T. & Danilov, V.A. Magnetoresistance of La0.67Sr0.33MnO3 epitaxial films grown on a substrate with low lattice mismatch. Phys. Solid State 47, 2281–2286 (2005). https://doi.org/10.1134/1.2142891

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