title: Effect of cation disorder on structural, magnetic and dielectric properties of La2MnCoO6 double perovskite.
abstract: The origin of dielectric anomalies and magnetodielectric response of La(2)MnCoO(6) 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 Mn(4+)/Co(2+) 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 frequency-temperature region where extrinsic effects dominate the dielectric response.
authors: Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus Universitari de Bellaterra, E-08193 Bellaterra, Spain.
authors: A J
authors: AJ
authors: Barón-González
authors: C
authors: C
authors: Frontera
authors: J L
authors: JL
authors: García-Muñoz
authors: B
authors: B
authors: Rivas-Murias
authors: J
authors: J
authors: Blasco
mesh_terms: D002412:Cations / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D004553:Electric Conductivity; D007811:Lanthanum / Q000737:chemistry*; D008280:Magnetics; D017895:Manganese Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D033362:Powder Diffraction
chemical_list: D002412:Cations; D017895:Manganese Compounds; D010087:Oxides; D003035:Cobalt; C103829:lanthanum oxide; C027424:manganese oxide; D007811:Lanthanum; C060728:cobalt oxide