Abstract
The structural, magnetic and electrical properties of (La0.70−xNdx)Sr0.30Mn0.70Ti0.30 O 3 perovskites (0 ≤ x ≤ 0.30) prepared by the usual ceramic procedure were investigated. Structural Rietveld refinements of the X-ray powder diffraction revealed that for x = 0 the compound crystallizes in a rhombohedral (R\(\bar {{3}}\)c) perovskite structure, while for x = 0.10, 0.20 and 0.30 the structure becomes orthorhombic (Pbnm). The field-cooled, zero-field-cooled and M(H) measurements lead to conclude that the samples with x≥0.10 behave like spin-glass systems. The temperature dependence of the resistivity exhibits two transitions at two temperatures T p1 and T p2, with the same width for the two peaks. T P1 results from the competition between double-exchange and super-exchange mechanisms inside the grain (intrinsic effects) whereas T P2 arises due to the grain boundary effects (extrinsic effect). The resistivity of this system seems to be related to the competition between antiferromagnetic insulating (AFI) phases, ferromagnetic insulating (FMI) phases and ferromagnetic metal (FMM) phases, which is induced by Nd doping effect.
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Acknowledgments
We wish to thank Mr. Thierry Guizouarn (Sciences Chimiques de Rennes, UMR 6226-CNRS, Université de Rennes 1, 35042 Rennes Cedex, France) for his help in magnetic measurements.
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Abassi, A., Kallel, N., Kallel, S. et al. Structural Magnetic and Electrical Properties in Nd-Doped Manganites (La0.70−x Nd x )Sr0.30Mn0.70Ti0.30O3 with 0 ≤ x ≤ 0.30. J Supercond Nov Magn 27, 2353–2364 (2014). https://doi.org/10.1007/s10948-014-2597-x
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DOI: https://doi.org/10.1007/s10948-014-2597-x