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- W2036376504 abstract "The temperature dependence of the crystal structure and electronic properties of brownmillerite-like Ca2.5Sr0.5GaMn2O8 has been studied by neutron powder diffraction and μSR spectroscopy. The results show that short-range 2D magnetic order begins to develop within the perovskite-like bilayers of MnO6 octahedra approximately 50 K above the 3D Néel temperature of ∼150 K. The bilayers show a structural response to the onset of magnetism throughout this temperature range whereas the GaO4 layers that separate the bilayers only respond below the 3D ordering temperature. XANES spectroscopy shows that the sample contains Mn3+ and Mn4+ cations in a 1:1 ratio, and the behavior in the region of the Néel transition is interpreted as a local charge ordering. Electron diffraction and high-resolution electron microscopy have been used to show that the local microstructure is more complex than the average structure revealed by neutron diffraction, and that microdomains exist in which the GaO4 tetrahedra show different orientations. It is argued that the bonding requirements of diamagnetic gallium control the electronic behavior within the perovskite-like bilayers." @default.
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- W2036376504 date "2004-09-11" @default.
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- W2036376504 title "Ca<sub>2.5</sub>Sr<sub>0.5</sub>GaMn<sub>2</sub>O<sub>8</sub>: Diamagnetic Ga in Control of the Structural and Electronic Properties of a Bilayered Manganate" @default.
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- W2036376504 doi "https://doi.org/10.1021/ja0465000" @default.
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