Magnetic properties of Er(Co,Mn)O3 perovskites |
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| Affiliation: | 1. Sciences Chimiques de Rennes, UMR-CNRS 6226, Université de Rennes 1, 35042 Rennes cedex, France;2. GEMA, Centro Universitário FEEVALE, Novo Hamburgo, RS, Brazil;3. Instituto Cerámica y Vidrio,CSIC, Electroceramics Department. Campus de Cantoblanco, 28049 Madrid, Spain;1. Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany;2. Department of Chemistry, Iowa State University, Ames, IA 50011, USA;1. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721302, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;1. Laboratoire de la matière condensée et des nanosciences, Université de Monastir 5019, Tunisia;2. Laboratoire de recherches en énergie et matière pour les développements des sciences nucleaires, CNSTN, Sidi Thabet 2020, Tunisia;3. Institut Néel, CNRS et Université Joseph Fourier, B.P. 166, 38042 Grenoble, France;1. Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 TURKU, Finland;2. University of Turku Graduate School, University of Turku, FI-20014 TURKU, Finland |
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| Abstract: | 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. |
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