Anomalous magnetic and electrical properties of disordered double perovskite alloy LaCaMnFeO 6

• Published in: Materials research express Vol. 11; no. 7; p. 76101
• Main Authors: Tran, T A, Hoang, T P, Khan, D T, Rutkauskas, A V, Kichanov, S E, Tuan, N Q, Truong-Son, L V, Dang, N T, Phan, T L, Trang, T T, Abiyev, A S, Jabarov, S H, Sklyarova, A S, Bolotov, E V, Zakhvalinskii, V S
• Format: Journal Article
• Language: English
• Published: 01-07-2024
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/ad5f07

Abstract Double perovskite alloys are of significant interest owing to their intriguing magnetic properties and potential practical applications. In this study, we provided a detailed report on the structural, electrical and magnetic features of the double perovskite LaCaMnFeO 6 , prepared via the conventional solid-state reaction technique. Neutron diffraction analysis showed that the sample is single-phase adopting the Pnma orthorhombic structure with random distribution of La 3+ /Ca 2+ and Mn 4+ /Fe 3+ ions on A- and B-sites, respectively. A long-range G-type antiferromagnetic order was formed below T N = 250 K. Magnetic measurements unveiled a cluster glassy behavior at low temperatures with a complex distribution of cluster magnetic anisotropy energy. Ferromagnetic clusters consisting of two Mn 4+ and one Fe 3+ were found to exist in the paramagnetic phase. The complex magnetic properties of LaCaMnFeO 6 are attributed to the cation disorder effect combined with the competition between magnetic interactions. Unusual electrical behavior with a large positive magnetoresistive effect was observed and correlated to magnetic phase transitions.