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- W2079148913 abstract "The transport properties of the manganites ${mathrm{La}}_{1ensuremath{-}x}{mathrm{Sn}}_{x}{mathrm{MnO}}_{3+ensuremath{delta}}$ with $x=0.1--0.5$ and of Fe-doped samples have been comprehensively studied using magnetoresistance measurements, ${}^{57}mathrm{Fe}$ and ${}^{119}mathrm{Sn}$ Mossbauer spectroscopy, and x-ray diffraction. At the Sn concentration $x=0.5,$ ${mathrm{La}}_{0.5}{mathrm{Sn}}_{0.5}{mathrm{MnO}}_{3+ensuremath{delta}},$ is a single phase. The manganites ${mathrm{La}}_{1ensuremath{-}x}{mathrm{Sn}}_{x}{mathrm{MnO}}_{3+ensuremath{delta}}$ with $x<0.5$ consist of two phases, $mathrm{AB}{mathrm{O}}_{3}$ and ${A}_{2}{B}_{2}{mathrm{O}}_{7}$; the chemical formulas are ${mathrm{LaMnO}}_{3+ensuremath{delta}}$ and $({mathrm{La}}_{0.5}{mathrm{Sn}}_{0.5}{)}_{2}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$, respectively. The colossal magnetoresistance (CMR) in ${mathrm{La}}_{1ensuremath{-}x}{mathrm{Sn}}_{x}{mathrm{MnO}}_{3+ensuremath{delta}}$ appears to have its origin in deficient La and/or Mn ions in the $mathrm{AB}{mathrm{O}}_{3}$ phase. Mossbauer spectra show that a superparamagnetic doublet exists from $T=250--77 mathrm{K}$ for the $mathrm{AB}{mathrm{O}}_{3}$ phase in the Fe-doped sample and may have superparamagneticlike spin clusters that lead to a low saturation field. Consequently, the CMR reaches 75% at an applied field of only 20 kOe for the Fe-doped sample; however, the same CMR requires fields as high as 70 kOe in the undoped ${mathrm{La}}_{0.7}{mathrm{Sn}}_{0.3}{mathrm{MnO}}_{3+ensuremath{delta}}$ sample." @default.
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- W2079148913 date "1999-10-01" @default.
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- W2079148913 title "Magnetoresistance and phase composition of La-Sn-Mn-O systems" @default.
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- W2079148913 doi "https://doi.org/10.1103/physrevb.60.10284" @default.
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