6-layered hexagonal (6H) barium triple perovskites with general formula Ba3MM’2O9 are
interesting due to the various physical properties they exhibit like quantum spin liquid
behaviour, large magnetoelastic effect, microware dielectric resonating properties etc by virtue
of their specific structure. However, this work takes a different turn on the hexagonal triple
perovskites. We aim to address the lacunae in the literature regarding exchange bias effect
studies in B-site (3d-3d-4d transition metal cations) multi-ion doped 6H barium triple
perovskites. Structure property correlations in three novel 6H triple perovskite barium
ruthenates are explored. Exciting magnetic properties like exchange bias phenomena and
Griffiths phase like behaviour is observed in the systems. Compositional selection to induce
higher degree of site disorder, mixed valency and spatial or magnetic inhomogeneity is carried
out to achieve competing magnetic interactions in these systems.
References:
1. Mahima M. Kurian, Ranjana R. Das, Chinnu V. Devan, Manoj Raama Varma, Claire V.
Colin and P.N. Santhosh “Exchange bias effect and inhomogeneous magnetism in 6H
Ba3CoFeRuO9: Role of structural site disorder” Journal of Magnetism and Magnetic
Materials, 568, 170372 (2023).
2. Mahima M Kurian, Zhenhong Tan, Yuichi Shimakawa and PN Santhosh “Probing Griffiths
phase like behavior and exchange bias phenomena in 6H Ba3Co0.5Mn0.5Ru2O9 by B-site
doping” Journal of Applied Physics, 134, 043901 (2023)