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- W120850004 abstract "A Mossbauer study of 5 7 Fe doped Ni I I I perovskites, NdNi 0 . 9 8 Fe 0 . 0 2 O 3 and SmNi 0 . 9 8 Fe 0 . 0 2 O 3 , in the magnetic ordering domain (T«T N ) has revealed that the Fe probes occupy two types of sites, i.e., Fe(1) and Fe(2), showing very different values of the magnetic hyperfine fields (H 1 430-450 kOe, H 2 15 -22 kOe). The close values of the isomer shift (δ) and the second-order quadrupole perturbation parameter (e) in the subspectra, for both Fe sites, have underlined that all the Fe sites are crystallographically equivalent. In the light of orbital ordering model suggested by the neutron diffraction studies, the partial substitution of Ni I I I (t 6 2 g e 1 g ) by Fe 3 + (t 3 2 g e 2 g ) may induce significant topological frustration of Fe 3 + spins in surroundings of Ni I I I orbitals, leading to two different magnetic environments around Fe below T N . Additionally, the Mossbauer spectra at 300 K (>T N ) indicate that all the available sites for probe atoms are crystallographically equivalent in the insulating SmNi 0 . 9 8 Fe 0 . 0 2 O 3 as well as in the metallic NdNi 0 . 9 8 Fe 0 . 0 2 O 3 . The present result may be an evidence of the important role of the orbital ordering in determining the electronic properties of the Ni I I I perovskites containing large rare earth." @default.
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- W120850004 date "2002-01-01" @default.
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- W120850004 title "Orbital ordering in NdNiO3 and SmNiO3 investigated by Mössbauer spectroscopy" @default.
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