Abstract
A series of Sr-substituted Gd1-x Sr x MnO3(0.1≤x≤0.3) materials was prepared via a standard method involving solid-state reaction. Their crystal structure within the entire doping region was determined to be orthorhombic perovskite type. The magnetic properties of the perovskite Gd1-x Sr x MnO3(0.1≤x≤0.3) were thoroughly investigated. It appears that Mn ions with high valence state can induce stronger magnetization, and negative magnetization is evident in the manganites with x=0.1 and x=0.2, suggesting that valence fluctuation plays an important role in such systems. The result of XPS analysis indicates that the valence state of Mn ions is 3.25 and there seems to be excess amounts of oxygen in the structure of Gd0.8Sr0.2MnO3+δ. In addition, the results of magnetization measurements demonstrate that spin reversal occurs only when the applied field is less than 1.99×105 A/m, which presumably could be due to the negative exchange interaction between Mn sub-lattice and Gd sites.
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Supported by the National Natural Sciences Foundation of China(Nos.21271082, 21371068).
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Zhang, Y., Li, J., Zhang, Z. et al. Negative magnetism in perovskite manganites Gd1-x Sr x MnO3(0.1≤x≤0.3). Chem. Res. Chin. Univ. 31, 699–703 (2015). https://doi.org/10.1007/s40242-015-5196-x
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DOI: https://doi.org/10.1007/s40242-015-5196-x