Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1476457 | Journal of the European Ceramic Society | 2007 | 4 Pages |
The erbium-based manganite ErMnO3 has been partially substituted at the manganese site by Co in the general formula ErCoxMn1−xO3. The perovskite orthorhombic structure is found from x(Co) = 0.3 up to x(Co) = 0.7, provided that the synthesis is performed under oxygenation conditions to favour the presence of Co3+. Magnetic properties show unusual phenomena, correlated with the presence of different magnetic entities (i.e., Er3+, Co2+, Co3+, Mn3+, Mn4+): the overall magnetic moment reverses its sign when the sample is cooled under an external magnetic field, while the magnetization loops performed at T < 4 K show intersecting branches at low fields and a sudden jump at high fields. A phenomenological model of two interacting sublattices, coupled by an antiferromagnetic exchange interaction, explains the inversion of the overall spin, while the high-field discontinuity is explained in terms of dynamical models.