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• W2007157077 abstract "The effects of cation substitution in the manganese site of charge-ordered Nd0.5Sr0.5MnO3 have been investigated to elucidate how the properties of this material change with chromium doping. Nd0.5Sr0.5Mn1−xCrxO3 (x=0, 0.05, 0.1, 0.15, 0.2, 0.25) compounds have been studied by X-ray diffraction and transport and magnetic measurements. All samples were determined to be single phase and crystallized in an orthorhombic structure. Magnetic measurements showed that chromium doping decreases the charge-ordering temperature Tco as x values are increased from 0 to 0.05. The charge ordering is completely destroyed for all the higher Cr doping levels (x>0.05), and the material changes from an antiferromagnetic insulator to the ferromagnetic metallic (FMM) state for 0.05<x<0.2. The resistivity decreases as the result of a metal–insulator transition for x<0.2, but the resistivity increases, and the material becomes an insulator if x>0.2. At the same time, the magnetization increases with increasing Cr content, reaches a maximum for x=0.15 and then decreases for x>0.15. It is proposed that Cr destroys the charge ordering and facilitates double exchange between Mn3+–O–Mn4+. It is thus responsible for the FMM state seen at low Cr doping levels, while an antiferromagnetic interaction between Mn4+–O–Cr3+ or Cr3+–O–Cr3+ is responsible for the insulator state at high Cr doping levels." @default.
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• W2007157077 date "2001-11-01" @default.
• W2007157077 modified "2023-10-16" @default.
• W2007157077 title "Effects of Cr doping on the structure, charge ordering, transport and spin ordering state in Nd0.5Sr0.5Mn1−xCrxO3" @default.
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• W2007157077 doi "https://doi.org/10.1016/s0921-4534(01)00791-2" @default.
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