Abstract
The nominal composition LaxBa4−xMn3O10 (x=0–0.2) compounds were synthesized using solid-state reaction under high pressure. The structures of the two single-phase samples LaxBa4−xMn3O10 (x=0,0.05) have been studied by powder x-ray diffraction, electron diffraction, and high-resolution transmission electron microscopy (HRTEM). For the x=0.05 sample, some intergrowth structures and stacking faults were revealed by HRTEM observations. According to the results of electron energy-loss spectroscopy (EELS) analysis, the slight doping of La into the parent phase compound Ba4Mn3O10 was confirmed. Moreover, the L3∕L2 intensity ratio of Mn-L2,3 edges in the EELS spectra indicates the variation of Mn ionic valence state induced by the doping of La. Based on analysis of magnetic properties, the magnetization for the x=0 sample shows a broad peak centered around 170K and a sharp upturn at low temperature of 15K, which is due to a short-range low-dimensional antiferromagnetic ordering. For the x=0.05 sample, the slight doping of La leads to significant changes in magnetic properties. The zero-field cooled and field cooled magnetizations and hysteresis loop curves suggest that La doping induces ferromagnetic clusters in the antiferromagnetic matrix.
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