Dielectric relaxations, magnetodielectric and magnetoelectric interactions in [Bi.sub.0.6][La.sub.0.4]Mn[O.sub.3] ceramics

• Published in: Physics of the solid state 2016-01, p.97
• Main Authors: Turik, A.V, Pavlenko, A.V, Makhiboroda, A.V, Reznichenko, L.A
• Format: Article
• Language: English
• Subjects: Ceramic materials; Ceramics; Ferromagnetism; Magnetization
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783416010327

Complex permittivity [ζ.sup.*]/[e.sub.0] = ζ'/[ζ.sub.0] - iζ"/[ζ.sub.0] of the bismuth-lanthanum manganite [Bi.sub.0.6][La.sub.0.4]Mn[O.sub.3] ceramics has been measured in the temperature range of 10-220 K at frequencies f = 20-[10.sup.6] Hz and magnetic inductions B = 0-0.846 T. At a temperature of 80 K, the spectra ζ'/[ζ.sub.0](t) and ζ"/[ζ.sub.0](t) demonstrate the dielectric relaxation that is a superposition of contributions of several relaxation processes, each of which is dominant in its frequency range: I (f < [10.sup.3] Hz, II ([10.sup.3] < f < [10.sup.5] Hz), and III ([10.sup.5] < f < [10.sup.6] Hz). In the range of 10-120 K, anomalous behavior of ζ'/[ζ.sub.0](T) and ζ"/[ζ.sub.0](T) is observed near the temperature of the transition from the paramagnetic to ferromagnetic phase and is due to the Anderson localization of charge carrier on a spin disorder.