Abstract
Effect of bivalent cation Ca-doping on magnetic properties in multiferroic YMnO3 manganites was systemically studied by DC and AC magnetic measurements. Series of samples were prepared by solid-state reaction method with composition Y1−x Ca x MnO3 (x=i/8,i=2,3,…,7). The results show that each of the zero-field-cooling (ZFC) curves has a clear cusp and it shifts to higher temperature with increasing Ca-doping x. From the χ −1–T curve, the temperature of charge-ordering (CO) state T CO is given at about 244.0 K and this indicates that the CO state is dominated by the cooperative Jahn–Teller effect in Y1/2Ca1/2MnO3 with small A-site cation, for which there is a different behavior compared to the other manganites of larger 〈r A 〉. When x=2/8 and 7/8 for Y1−x Ca x MnO3, the magnetization curve shows strong irreversibility between ZFC and FC data. The variation of AC susceptibility presents a maximum cusp at the beginning temperature of the bifurcation between ZFC and ZF curve and shifts to higher temperature with increasing measurement frequency for AC susceptibility. These results can be characterized by spin-glass, indicating that much more itinerant eg electrons are promoting the magnetic transition.
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Su, Y., Chen, Z., Li, Y. et al. Effect of Bivalent Cation Ca-Doping on Magnetic Properties in Multiferroic YMnO3 Manganites. J Supercond Nov Magn 23, 501–506 (2010). https://doi.org/10.1007/s10948-009-0623-1
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DOI: https://doi.org/10.1007/s10948-009-0623-1