Eur. Phys. J. Plus (2018) 133: 296
https://doi.org/10.1140/epjp/i2018-12124-9

Regular Article

Effect of Fe doping on structure and magnetotransport properties of perovskite manganite

¹ Institute of Research and Development, Duy Tan University, R.809, K7/25 Quang Trung, 550000, Da Nang, Vietnam
² Belgorod State National Research University, Pobedy St., 85, 308015, Belgorod, Russia
³ Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Joliot-Curie str., 6, 141980, Dubna, Russia
⁴ Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, 449-791, Yongin, Korea
⁵ Scientific Practical Materials Research Centre, NAS of Belarus, P. Brovki str., 19, 220072, Minsk, Belarus
⁶ National University of Science and Technology “MISiS”, Leninsky Prospekt, 4, 119049, Moscow, Russia
⁷ South Ural State University, Lenin Prospect, 76, 454080, Chelyabinsk, Russia
⁸ Bayerisches Geoinstitut, Universität Bayreuth, D-95447, Bayreuth, Germany
⁹ Institute of Physics, ANAS, AZ-1143, Baku, Azerbaijan

^* e-mail: truhanov@ifttp.bas-net.by

Received: 13 April 2018
Accepted: 25 June 2018
Published online: 2 August 2018

Abstract

Neutron powder diffraction experiments to refine the crystal and magnetic structures of a La_0.7Ca_0.3Mn_0.5Fe_0.5O₃ 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 La_0.7Ca_0.3Mn_0.5Fe_0.5O₃ 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.