Ferrodistorsive orbital ordering in the layered nickelate NaNiO_2: A density-functional study

Details Ferrodistorsive orbital ordering in the layered nickelate NaNiO_2: A density-functional study Ferrodistorsive orbital ordering in the layered nickelate NaNiO_2: A density-functional study

2004-09-10

arxiv.org/abs/cond-mat/0409278v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures Submitted to MMM2004 conference Proceedings

Scientific paper

10.1063/1.1854414

The electronic structure and magnetism in the sodium nickelate NaNiO_2 in the low-temperature phase is studied from density-functional calculations using the linear muffin-tin orbitals method. An antiferromagnetic solution with a magnetic moment of 0.7 m_B per Ni ion is found. A ferrodistorsive orbital ordering is shown to occur due to the Jahn-Teller distortion around the Ni^{3+} ion in agreement with the orbital ordering inferred from neutron diffraction. While the intralayer exchange is ferromagnetic, the interlayer exchange is weakly antiferromagnetic, mediated by a long Ni-O-Na-O-Ni superexchange path.

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