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• W1996360425 abstract "The nuclear and magnetic structures of the colossal magnetoresistive compounds Nd0.7Ba0.3−ySryMnO3 (0⩽y⩽0.2) have been investigated by means of neutron powder diffraction. For all the Ba/Sr substitutions, the nuclear structure remains orthorhombic within temperature range 1.5–293 K. However, the compound Nd0.7Ba0.3MnO3 is characterized by the crystallographic space group Imma whereas the Sr-doped compounds crystallize in the Pnma space group. As expected from the bigger size of Ba-ion radii, the buckling as well as the distortion of MnO6 octahedra become less pronounced when increasing the amount of Ba in Nd0.7Ba0.3−ySryMnO3. In order to better understand the physical properties of these samples, these results have been included in the more general diagram Nd0.7A′0.3−y SryMnO3 (A=Ca, Ba). In this series, the observed maximum in TC is not easily explained with standard parameters. Whereas the Mn magnetic moments display the same characteristics as observed in similar magnetoresistive compounds, the behavior of Nd magnetic moments shows unusual features when changing the Sr/Ba ratio in Nd0.7Ba0.3MnO3. In all compounds, we observe a ferromagnetic ordering of both the Nd and Mn magnetic moments along the b-axis. However, the Nd and Mn magnetic moments point in the same direction for the compounds with y⩾0.05 but in opposite directions in Nd0.7Ba0.3MnO3. An important evolution of the absolute value of Nd magnetic moment at 1.5 K is also observed when changing the Sr/Ba ratio." @default.
• W1996360425 created "2016-06-24" @default.
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• W1996360425 date "2003-08-01" @default.
• W1996360425 modified "2023-09-25" @default.
• W1996360425 title "Role of the A-site cations on the magnetic structures and transport properties in the Nd0.7Ba0.3−ySryMnO3 (0⩽y⩽0.2) perovskite" @default.
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• W1996360425 doi "https://doi.org/10.1016/s0304-8853(03)00209-9" @default.
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