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- W2007047504 abstract "${mathrm{La}}_{2}$${mathrm{NiO}}_{4.125}$ exhibits a cooperative ordering of dopant-induced holes and Ni spins below a transition temperature of 110 K. There is also an ordering of interstitial oxygens that occurs near room temperature. We present a comprehensive analysis of experimentally observed superlattice intensities in terms of structural models, justifying previous identifications. The model for the interstitial order involves a 3aifmmodetimeselsetexttimesfi{}5bifmmodetimeselsetexttimesfi{}5c unit cell with an ideal interstitial density of ensuremath{delta}=2/15 per formula unit. In the spin and charge ordered state, the magnetic moments are sinusoidally modulated within the ${mathrm{NiO}}_{2}$ planes. The moments point transverse to the modulation direction, with nearest neighbors antiparallel, and have a maximum amplitude that is >80% of that observed in undoped ${mathrm{La}}_{2}$${mathrm{NiO}}_{4}$. A corresponding modulation of atomic positions within ${mathrm{NiO}}_{2}$ planes involves breathing-mode distortions consistent with a modulation of the charge density. The results are compared with theoretical models and with experimental observations on related systems." @default.
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- W2007047504 date "1995-08-01" @default.
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- W2007047504 title "Cooperative ordering of holes and spins in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>NiO</mml:mi></mml:mrow><mml:mrow><mml:mn>4.125</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:…" @default.
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- W2007047504 doi "https://doi.org/10.1103/physrevb.52.3581" @default.
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