Abstract
The crystal and magnetic structures of the giant magnetoresistive compound Nd 0.7Ba 0.3MnO 3 have been investigated by means of neutron powder diffraction. The nuclear structure remains orthorhombic within the temperature range 1.5–300 K. As expected from the higher size of Ba-ion radii, the buckling as well as the distortion of MnO 6 octahedra are less pronounced than in the parent compounds Nd 0.7A′ 0.3MnO 3 (A′ = Ca, Sr). At 1.5 K, we observe a ferromagnetic ordering of both Nd and Mn magnetic moments along the b-axis. However, Nd and Mn moments point in opposite directions. The saturated magnetic moment of Mn ions is 3.45 μ B, whereas the magnetic moment of Nd ions reaches 0.45 μ B at 1.5 K. The Curie temperatures are T C(Mn) = 142 K and T C(Nd) = 20 K.
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