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- W2397859968 abstract "The spin susceptibility of the localized $mathrm{Mn}({t}_{2g})$ electrons, ${ensuremath{chi}}_{s}$, and the spatially distributed spin density of the doped electrons were investigated by $^{17}mathrm{O}$ nuclear magnetic resonance (NMR) in the paramagnetic (PM) and antiferromagnetic (AF) phases of electron-doped ${mathrm{SrMnO}}_{3ensuremath{-}x}$ ceramics with the cubic structure. Three lightly doped samples $(2x<0.015)$ were studied with ${T}_{N}=220phantom{rule{4.pt}{0ex}}text{K}--240$ K. In the PM state ${ensuremath{chi}}_{s}$ increases gradually from ${T}_{N}$ and reaches a broad maximum above $ensuremath{sim}1.5{T}_{N}$. The gapped behavior of ${ensuremath{chi}}_{s}$ indicates a low-dimensional short-range spin order persisting above ${T}_{N}$. These short-range one-dimensional correlations are consistent with $^{17}mathrm{O}$ NMR results obtained at room temperature, which show that Mn magnetic moments are aligned along the edges of the cubic unit cell. Above 350 K all doped electrons are fast-moving ${e}_{g}$ electrons. They provide the uniform polarization of the localized spins which increases ${ensuremath{chi}}_{s}$ and the increasing doping shifts the oxygen-deficient ${mathrm{SrMnO}}_{3ensuremath{-}x}$ oxide towards a ferromagnetic (FM) metallic state. At lower $T$ the doped electrons are heterogeneously distributed in the oxide: The fraction of the fast-moving electrons diminishes and vanishes below 100 K, while the remaining doped electrons slow down their hopping and each of them creates a FM domain. These FM domains which are detected below 10 K by $^{55}mathrm{Mn}$ NMR can be considered as small-size magnetic polarons. Their $T$-activated hopping in the G-type AF lattice was probed by $^{17}mathrm{O}$ spin-echo experiments. The energy barrier of hopping shows a trend to grow with increasing doping, indicating that the de Gennes metallic ground state cannot be achieved in oxygen-deficient ${mathrm{SrMnO}}_{3ensuremath{-}x}$ oxides, probably due to detrimental oxygen vacancy defects." @default.
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- W2397859968 date "2016-05-18" @default.
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- W2397859968 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mmultiscripts><mml:mtext>O</mml:mtext><mml:mprescripts /><mml:none /><mml:mn>17</mml:mn></mml:mmultiscripts></mml:math>NMR study of the doped electrons in lightly oxygen-deficient cubic<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>SrMnO</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>" @default.
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- W2397859968 doi "https://doi.org/10.1103/physrevb.93.174413" @default.
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