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• W2891766085 abstract "The structural properties and the magnetic ground state of $mathrm{S}{mathrm{r}}_{2/3}mathrm{L}{mathrm{n}}_{1/3}mathrm{Fe}{mathrm{O}}_{3}$ (Ln = La, Pr, Nd) samples were studied by means of synchrotron x-ray powder diffraction, neutron powder diffraction, and Mossbauer spectroscopy. All samples exhibit a metal-insulator-like transition coupled to a magnetic arrangement at a critical temperature, ${T}_{mathrm{MI}}$. The diffraction techniques reveal strong structural changes at ${T}_{mathrm{MI}}$ that lead to new cells with reduced symmetry at low temperature. The new symmetry of the low-temperature phase has been determined for all compounds. The space groups are P$overline{3}$c1 for La-based compound and A2/n for the rest of samples. The high-resolution x-ray patterns detected superstructure peaks that can be accounted for by a small charge disproportionation between two nonequivalent Fe sites in the low-temperature phase explained in terms of a charge density wave that propagates along one of the body diagonals of the primitive cubic cell of these compounds. Our results clearly reveal that a full charge disproportionation of ${mathrm{Fe}}^{4+}$ into ${mathrm{Fe}}^{3+}$ and ${mathrm{Fe}}^{5+}$ is not produced. We have determined the magnetic ordering of these samples exhibiting an antiferromagnetic structure with a sixfold periodicity with respect to the primitive cubic structure. The magnetic group accounting for the magnetic arrangements was obtained by a symmetry analysis and it is C2/c (15.85) for all samples but with different unit cell depending on the type of ${mathrm{FeO}}_{6}$ tilts. The collinear ordering of Fe moments is established perpendicular to the charge density wave (along the body diagonal of the primitive cubic cell) and also perpendicular to the unique monoclinic axis." @default.
• W2891766085 created "2018-09-27" @default.
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• W2891766085 date "2018-09-18" @default.
• W2891766085 modified "2023-10-16" @default.
• W2891766085 title "Structural properties of charge disproportionation and magnetic order in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ln</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>FeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> (Ln=La, Pr, and Nd)" @default.
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• W2891766085 doi "https://doi.org/10.1103/physrevb.98.104422" @default.
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