Abstract.
Neutron powder diffraction experiments to refine the crystal and magnetic structures of a La0.7Ca0.3Mn0.5Fe0.5O3 compound were carried out at temperatures of 10, 50, 80, 100, 120, 150, 200, 250 and 300 K. The obtained results support the conclusion that there is no long-range ferromagnetic order at all these temperatures. Structural parameters and, especially, the magnetic moments are calculated as a function of temperature. Their polynomial extrapolation is performed. Magnetization and electrical resistivity measurements were also performed in the temperature range of 5–300 K in magnetic fields up to 1 T. Field magnetization is measured to confirm the formation of the spin-glass-like state. These experimental results indicate formation of a complex magnetic state in which the long-range antiferromagnetic G-type phase coexists with short-range ferromagnetic clusters. Electrical conductivity of La0.7Ca0.3Mn0.5Fe0.5O3 demonstrates an anomalous temperature behavior suggesting a switching between different states. Correlation between the critical temperatures of magnetic and electrical transitions is demonstrated. Resistivity data in various theoretical models are processed. We discuss the origin of the unconventional magnetic state, the mechanisms of the electrical conductivity, and the correlation between magnetic and transport properties in this manganite.
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Dang, N.T., Zakhvalinskii, V.S., Kozlenko, D.P. et al. Effect of Fe doping on structure and magnetotransport properties of perovskite manganite. Eur. Phys. J. Plus 133, 296 (2018). https://doi.org/10.1140/epjp/i2018-12124-9
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DOI: https://doi.org/10.1140/epjp/i2018-12124-9