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- W2952249208 abstract "Manganese perovskites with the general formula A1−xA′MnO3+δ (A = La, rare earth, A′ = rare earth, Ca, Sr, Ba, etc.) were discovered in the 1950’s [1] and soon after their properties were extensively studied. The interest in the manganite has been renewed in connection with the discovery of colossal magnetoresistance (CMR) [2, 3]. Structural and magnetic properties of these compounds are sensitive both to the manganese valence and to internal (chemical) factors. The family of these compounds, where the formula can be written in a general way as ABO3, is the mineral “perovskite” (CaTiO3) form of the ideal cubic structure (space group Pm3m). In the crystal unit cell the atoms occupy the following positions: A (0, 0, 0), B (1/2, 1/2, 1/2) and O (1/2, 0, 1/2), (1/2, 1/2, 0) and (0, 1/2, 1/2). The stability of this structure is governed by the structural factor t = rA+rO √ 2(rB+rO) , where rA, rB, and rO are the radius of A, B and O2− ions. For t between 0.8 and 1.0 the above mentioned type of crystal structure is stable. With changes in the valence of the ions the ionic radius changes and this could lead to a structural phase transition to the rhombohedral or orthorhombic phase and changes in the magnetic properties. The magnetic properties are correlated with the short and/or long-range charge, orbital and spin order. Significant role plays here also the separation of the phases with different properties and the Jahn–Teller effect which causes a distortion of the lattice. The role of these factors is discussed in the paper [4]. In this work the different points concerning the structural aspects and their influence on the magnetic properties of these compounds will be successively reviewed below." @default.
- W2952249208 created "2019-06-27" @default.
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- W2952249208 date "2010-08-01" @default.
- W2952249208 modified "2023-09-28" @default.
- W2952249208 title "Manganites - Structural Aspects" @default.
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- W2952249208 doi "https://doi.org/10.12693/aphyspola.118.303" @default.
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