Griffiths phase and spontaneous exchange bias in La1.5Sr0.5CoMn0.5Fe0.5O6
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2021
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La1.5Sr0.5CoMn0.5Fe0.5O6 (LSCMFO) compound was prepared by solid state reaction and its
structural, electronic and magnetic properties were investigated. The material forms in
rhombohedral R¯3c structure, and the presence of distinct magnetic interactions leads to the
formation of a Griffiths phase above its FM transition temperature (150 K), possibly related to
the nucleation of small short-ranged ferromagnetic clusters. At low temperatures, a spin
glass-like phase emerges and the system exhibits both the conventional and the spontaneous
exchange bias (EB) effects. These results resemble those reported for La1.5Sr0.5CoMnO6 but
are 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 unidirectional
anisotropy observed for LSCMFO is discussed and compared with those of resembling
double-perovskite compounds, being plausibly explained in terms of its structural and
electronic properties.
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Perovskite, Spontaneous exchange bias, Griffiths phase
Citação
SILVA, A . G. et al. Griffiths phase and spontaneous exchange bias in La1.5Sr0.5CoMn0.5Fe0.5O6. Journal of Physics: condensed matter, Bristol, v. 33, e065804, 2021. DOI: 10.1088/1361-648X/abc595. Disponível em: https://iopscience.iop.org/article/10.1088/1361-648X/abc595. Acesso em: 16 fev. 2024.