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• W2015602549 abstract "Solid solutions of Dy1−xCaxMnO3 (0.00⩽x⩽0.60) were prepared by solid state reaction of oxides and carbonates. Sintered bodies were obtained by firing between 1250 and 1450 °C. All compositions, including DyMnO3, crystallize in a perovskite structure of O′-type orthorhombic symmetry and space group Pbnm. Increase of Ca2+ content leads to a monotonic decrease of the orthorhombicity factor b/a. Electrical measurements show a semiconducting behavior for all compositions. The room temperature conductivity increases with Ca content, attaining relatively high values at x=0.60 and a correlative very low value of the activation energy. Thermally-activated small-polaron hopping mechanism controls the conductivity. Antiferromagnetic interactions between Dy spins are observed at TN=9.5 K. DyMnO3 behaves as a metamagnetic-like system, with no remanent magnetization at zero field. ZFC/FC cycles and the thermal evolution of the remanent magnetization of the Dy1−xCaxMnO3 solid solution show the presence of two interacting magnetic networks: a Dy sublattice, with a Curie–Weiss thermal dependence above TN, aligned antiparallel to the ferromagnetically ordered (Tc=80 K) Mn network. The local field at a given site depends on the exchange interaction J between these two sublattices, leading to a spin reversal when the magnetic moment of the dysprosium network is larger than the one produced by the ferromagnetic Mn sublattice." @default.
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• W2015602549 date "2003-09-01" @default.
• W2015602549 modified "2023-10-17" @default.
• W2015602549 title "Interacting networks and spin polarization in (Dy, Ca)MnO3" @default.
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• W2015602549 doi "https://doi.org/10.1016/s1293-2558(03)00146-8" @default.
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