Phase separation in La2−xAxCoMnO6 (A=Ca and Sr) perovskites |
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| Authors: | I. O. Troyanchuk A. P. Sazonov H. Szymczak D. M. Többens H. Gamari-Seale |
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| Affiliation: | (1) Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, Minsk, 220072, Belarus;(2) Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland;(3) Berlin Neutron Scattering Center, Hahn-Meitner-Institut, 14109 Berlin, Germany;(4) Institute of Material Science, National Center of Scientific Research “Demokritos”, 15343 Athens, Greece |
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| Abstract: | Magnetic and neutron-diffraction studies of La2CoMnO6 doped with strontium and calcium ions are carried out. Stoichiometric and calcium-containing samples are orthorhombically distorted, whereas the oxidation and doping with strontium ions stabilizes a rhombohedral structure. Neutron-diffraction studies show that La2CoMnO6 is a ferromagnet, whereas a Ca-substituted compound does not exhibit long-range magnetic order. The whole set of data suggest that these compounds are inhomogeneous magnets that consist of clusters in which Co2+ and Mn4+ ions are ordered similar to ions in NaCl and of regions in which there is no such ordering. These regions exhibit different magnetic properties. Phase separation is discussed in a model of solid solutions with intrinsic chemical inhomogeneity on the nanometer scale. |
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