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Closed Access item Effect of cation disorder on structural, magnetic and dielectric properties of La2MnCoO6 double perovskite

Authors:Barón-González, A. J.
Frontera Beccaria, Carlos
García-Muñoz, J. L.
Rivas-Murias, B.
Blasco, Javier
Issue Date:2011
Publisher:Institute of Physics Publishing
Citation:Journal of Physics Condensed Matter 23(49): 496003 (2011)
Abstract:The origin of dielectric anomalies and magnetodielectric response of La2MnCoO6 has been investigated by means of ultra-high resolution synchrotron x-ray powder diffraction, neutron powder diffraction, resistivity, magnetization and dielectric measurements. The study has been performed on two different bulk samples presenting different degrees of Mn/Co order: 95 and 74%. Beside the well-known influence on magnetic properties, our results show that the main effect of disorder lies on the electrical resistivity. Bond distances clearly show Mn4+/Co2+ valence states in the well-ordered sample, while for the disordered one this picture still holds. AC resistivity data show dielectric anomalies and a small magnetodielectric effect, but impedance complex plane analyses prove that these phenomena appear at the frequencytemperature region where extrinsic effects dominate the dielectric response. © 2011 IOP Publishing Ltd.
Identifiers:doi: 10.1088/0953-8984/23/49/496003
issn: 0953-8984
e-issn: 1361-648X
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