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Iron-induced magnetic, transport and magnetoresistance behavior in Nd0.67Sr0.33MnO3 epitaxial films

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Abstract

The effects of Fe doping on Mn site in the colossal magnetoresistive film, Nd0.67Sr0.33MnO3 have been studied by preparing the series Nd0.67Sr0.33Mn1-xFexO3 (x=0,0.05 and 0.1). Upon doping, no structural changes have been found. However, the Curie temperature, the associated metal-to-insulator transition temperature and the magnetization decrease drastically with Fe doping. The resistivity in the paramagnetic regime for all the samples follows Emin–Holstein’s theory of small polaron. The polaron activation energy, Wp and resistivity coefficient, A increase with Fe doping. This effect may be ascribed to the fact that upon Fe doping, the long-range ferromagnetic order is destroyed and, therefore, Wp is enhanced in the system. As compared to the La-based system, Fe doping has a stronger tendency to destabilize the long-range ferromagnetic order in the Nd-based system. Large MR (as high as 90%) observed in the epitaxial NSMFO film may be attributed to the good lattice-matching between the grown film and substrate.

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  1. Department of Physics, National University of Singapore, 10 Kent Ridge Cresent, Singapore, Singapore, 119260

    Y.L. Chang & C.K. Ong

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  1. Y.L. Chang
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  2. C.K. Ong
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Correspondence to Y.L. Chang.

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PACS

75.47.Gk; 75.47.Lx; 75.70.-i

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Chang, Y., Ong, C. Iron-induced magnetic, transport and magnetoresistance behavior in Nd0.67Sr0.33MnO3 epitaxial films. Appl. Phys. A 79, 2103–2107 (2004). https://doi.org/10.1007/s00339-004-2895-4

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  • DOI: https://doi.org/10.1007/s00339-004-2895-4

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