Consequences of R3+ cationic radii on the dielectric and magnetic behavior of RCrO3 perovskites

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2020, Vol.126 (3), Article 148
• Main Authors: Singh, Kapil Dev, Singh, Fouran, Choudhary, R. J., Kumar, Ravi
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Applied physics; Cations; Characterization and Evaluation of Materials; Condensed Matter Physics; Frequency ranges; Machines; Magnetic properties; Manufacturing; Materials science; Nanotechnology; Neel temperature; Optical and Electronic Materials; Perovskites; Phase transitions; Physics; Physics and Astronomy; Processes; Rare earth orthochromites; Surfaces and Interfaces; Thin Films; Trivalent chromium
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-020-3324-z

In this study, the consequences of R 3+ cationic radii on the dielectric, conductivity and magnetic response of selected R CrO 3 perovskites are presented. The frequency-dependent real part of dielectric constant ( ε ′) and loss tangent (tan δ ) were studied at 300 K and observed that at low frequency the values are high. From the conductivity ( σ AC ) studies, we found that values of frequency exponent ( s ) are in the range 0.21–0.51 for the measured frequency range, which clearly indicates that the conduction mechanism is due to small polaron hopping. The magnetic studies reveal that all the synthesized samples exhibit magnetic phase transition (paramagnetic to antiferromagnetic) below the critical Neel temperature ( T N ) which is associated to Cr 3+ –O 2− –Cr 3+ exchange interaction and the value of T N decreases uniformly with decreasing R 3+ cationic radii. Some samples show interesting magnetic behavior, along with isothermal hysteresis curve proposing the spin reorientation phase transition of Cr 3+ magnetic ordering.