Abstract
In this manuscript we showed that Co-doping into CaMn7O12 (CMO) induces
charge disordering between Mn3+ and Mn4+ ions into the B site in the
perovskite structure leading to a cubic structure Im (3) over bar. Both
antiferromagnetic transitions at T-N1 and T-N2 previously observed in
CMO are strongly influenced by Co-doping. The transition at T-N1
disappears due to the structural disorder due to the Co doping, while
that one at T-N2 occurs at high temperatures. Our magnetic results
explained the role of Co-doping on the magnetic ordering of CMO. Since
this magnetic ordering drives the induced electric polarization in such
compound, the Co doping comes up as a simple way to tune the coupling
between electric polarization and magnetic helix in CMO. (C) 2017
Elsevier B.V. All rights reserved.
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