Abstract
The particle size and magnetic properties of charge-ordered (CO) Sm0.5Ca0.5MnO3 (SCMO) manganites prepared by solid-state reaction with ball milling have been investigated. Studies on surface morphology and particle size show that the particle size of SCMO manganite without ball milling is relative large (about 4 μm). With the ball milling, the particles begin to disperse, the particle size gradually decreases, and it reaches hundreds to tens of nanometers after milling for 12 h to 36 h. At this time, the particles agglomerate. Magnetization versus temperature (M–T) measurements and the inverse susceptibility versus temperature (χ−1–T) measurements show ferromagnetic (FM) transition at Curie temperature (TC) and spin glass (SG) state at freezing temperature (Tf). Moreover, there is a bulging (sunken) peak near 273 K in the M–T (χ−1–T) curves, suggesting that the CO anti-ferromagnetic (AFM) phase appears in the SCMO. The temperature corresponding to this bulging (sunken) peak represents CO temperature (TCO). The results of magnetization versus field (M–H) loops, M–T curves and χ−1–T curves show that the decrease of particle size with ball milling can suppress the formation of CO-AFM phase, decreasing the Tf, TC, TCO and coercive field (HC). Our work shows that it is a way to tune SG state and Curie temperature by controlling the particle size of the manganites with charge ordering.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11604067, 51601049, 51702289). We would like to thank colleagues from Beijing Synchrotron Radiation Facility (BSRF) and Shanghai Synchrotron Radiation Facility (SSRF) for their support.
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Wang, H., Wang, Y., Zhang, H. et al. Effect of particle size on spin glass state and Curie temperature in Sm0.5Ca0.5MnO3 with charge ordering. J Mater Sci: Mater Electron 32, 24540–24547 (2021). https://doi.org/10.1007/s10854-021-06931-1
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DOI: https://doi.org/10.1007/s10854-021-06931-1