Abstract
Three samples of La 0.7Ca 0.3MnO 3 nanoparticles were prepared by a reactive milling method with the milling times t m = 8, 12, and 16 h. The studies based on X-ray diffraction and electron microscopes reveal that the mean particle size of nanoparticles is about 7 nm. Saturation magnetization values determined from fitting the Langevin function to the magnetization curve at 5 K decrease from 36.8 to 14.7 emu/g with increasing t m from 8 to 16 h. Particularly, temperature dependences of saturation magnetization for these samples do not follow Bloch’s T 3/2 law, but follow a T ε law. The results obtained from investigating the DC magnetization and AC susceptibility indicate an existence of the spin-glass-like behavior in the samples, which is ascribed to the competition of ferromagnetic and anti-ferromagnetic interactions.
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Acknowledgments
This work was supported by the National Foundation for Science and Technology Development (NAFOSTED) under Grant Number of 103.02-2012.57 in Vietnam and by the Converging Research Center program through the Ministry of Science, ICT and Future Planning, Korea (2014048835). A part of the work was done in the Key Laboratory for Electronic Materials and Devices, Institute of Materials Science, VAST, Vietnam.
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Thanh, T.D., Manh, D.H., Phuc, N.X. et al. Deviation from Bloch’s T3/2 Law and Spin-Glass-Like Behavior in La0.7Ca0.3MnO3 Nanoparticles. J Supercond Nov Magn 28, 1051–1054 (2015). https://doi.org/10.1007/s10948-014-2869-5
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DOI: https://doi.org/10.1007/s10948-014-2869-5