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- W1992320551 abstract "Low-temperature neutron diffraction data on a ceramic sample of layered perovskite type ${mathrm{La}}_{2ensuremath{-}2x}{mathrm{Sr}}_{1+2x}{mathrm{Mn}}_{2}{mathrm{O}}_{7},$ $x=0.3,$ are reported. The neutron diffraction data show that this compound undergoes a ferromagnetic transition at 100 K ${(T}_{c}),$ but there is no antiferromagnetic signal as reported on a floating zone melt grown sample of the same nominal composition. The unit cell constants and cell volume for this nominal $x=0.3$ sample are slightly larger than those for samples which do show an antiferromagnetic component which indicates a higher Sr content. The magnetic structure was determined to have colinear Mn spins with a tilting angle against the c axis. The tilting angle abruptly increases from about 20ifmmode^circelsetextdegreefi{} near ${T}_{c}$ to about 50ifmmode^circelsetextdegreefi{} at 75 K and then gradually decreases afterwards to 30ifmmode^circelsetextdegreefi{} at 15 K. This anomalous tilting angle behavior correlates with a distortion index based on the variance of the Mn-O bond distances and can be understood qualitatively with a simple crystal field argument. Below ${T}_{c},$ there is a magnetostrictive effect on the c axis which correlates with the behaviors of the spin orientation and the Mn-O bond distances." @default.
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- W1992320551 date "1999-11-01" @default.
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- W1992320551 title "Neutron diffraction studies on a ferromagnetic layered manganite<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:mi>−</mml:mi><mml:mn>2</mml:mn><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>+</mml:mo><mml:mn>2</mml:mn><mml:mi>x</mml:mi></…" @default.
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- W1992320551 doi "https://doi.org/10.1103/physrevb.60.12867" @default.
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