Abstract
Barium-doped La2NiMnO6 double perovskites have been investigated in
order to elucidate the role of the B-site doping on its magnetic,
dielectric and vibrational properties. In all cases, we have obtained a
non-linear dependence with the Barium content signaling that a 5% molar
doping renders the maximum B-site ordering. By analyzing a series of
gradually doped samples, we have found that the effective magnetic
moment in the B-site can be enhanced by a factor of nearly 100% by 5%
Ba doping. In order to exclude oxidation state induce changes, XPS and
XANES measurements have been carried out concluding that nickel or
manganese oxidation states ratio are not modified by the Ba doping.
Raman spectroscopy correlates Ba doping with vacancies thus attributing
to the latter the role of primary source for structural defects in
Ba-La2NiMnO6 samples. This manuscript summarizes key consequences of the
B-site ordering which are crucial to address the optimization of the
magneto-electric coupling in Ba-La2NiMnO6 double perovskites. (C) 2015
Elsevier B.V. All rights reserved.
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