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- W2017277515 abstract "In this paper we present x-ray scattering results of charge and orbital ordering in the bilayer manganite ${mathrm{La}}_{2ensuremath{-}2x}{mathrm{Sr}}_{1+2x}{mathrm{Mn}}_{2}{mathrm{O}}_{7}$ with doping levels $x=0.5$ and $x=0.475.$ Using high-energy x-ray scattering, the structural modulation due to the Jahn-Teller ordering and the charge ordering due to the ${mathrm{Mn}}^{3+}/{mathrm{Mn}}^{4+}$ pattern have been measured. Both the $x=0.5$ and $x=0.475$ samples are found to display charge and Jahn-Teller order. We have confirmed that the wave vectors of the Jahn-Teller order, charge order, and orbital order are $stackrel{ensuremath{rightarrow}}{Q}=(0.25,0.25,0),$ $stackrel{ensuremath{rightarrow}}{Q}=(0.5,0.5,0)$ and $stackrel{ensuremath{rightarrow}}{Q}=(0.25,0.25,0).$ The origin of these has been confirmed by resonant x-ray scattering in the vicinity of the Mn K edge using polarization analysis. Contrary to previous studies, the Jahn-Teller order is found to be not reentrant, but is found to reduce in intensity at temperatures below 140 K for both samples. Charge ordering was also detected in the $x=0.5$ sample below this temperature." @default.
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- W2017277515 date "2003-05-30" @default.
- W2017277515 modified "2023-09-26" @default.
- W2017277515 title "Charge ordering and structural distortions at low temperature inLa2−2xSr1+2xMn2O7(x=0.475and0.5)" @default.
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- W2017277515 doi "https://doi.org/10.1103/physrevb.67.205110" @default.
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