Griffiths phase and spontaneous exchange bias in La 1.5 Sr 0.5 CoMn 0.5 Fe 0.5 O 6

SILVA, A G; SALCEDO RODRÍGUEZ, K L; CONTRERAS MEDRANO, C P; LOURENÇO, G S G; BOLDRIN, M; BAGGIO-SAITOVITCH, E; BUFAIÇAL, L

JOURNAL OF PHYSICS CONDENSED MATTER

IOP PUBLISHING LTD

Año: 2021 vol. 33 p. 1 - 7

0953-8984

La1.5Sr0.5CoMn0.5Fe0.5O6 (LSCMFO) compound was prepared by solid-state reaction and itsstructural, electronic, and magnetic properties were investigated. The material forms inrhombohedral R¯3c structure and the presence of distinct magnetic interactions lead to theformation of a Griffiths phase above its FM transition temperature (150 K), possibly related tothe nucleation of small short-ranged ferromagnetic clusters. At low temperatures, a spinglass-like phase emerges and the system exhibits both the conventional and the spontaneousexchange bias (EB) effects. These results resemble those reported for La1.5Sr0.5CoMnO6 butare discrepant to those found when Fe partially substitutes Co in La1.5Sr0.5(Co1−xFex )MnO6,for which the EB effect is observed in a much broader temperature range. The unidirectionalanisotropy observed for LSCMFO is discussed and compared with those of resemblingdouble-perovskite compounds, being plausibly explained in terms of its structural andelectronic properties.