Successive Phase Transitions in Na_{0.5}CoO_{2} based on the Triangular Lattice d-p Model

Details Successive Phase Transitions in Na_{0.5}CoO_{2} based on the Triangular Lattice d-p Model Successive Phase Transitions in Na_{0.5}CoO_{2} based on the Triangular Lattice d-p Model

2008-10-14

arxiv.org/abs/0810.2380v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

We investigate the electronic states of the CoO_2 plane in the layered cobalt oxides Na_{0.5}CoO_{2} using the realistic 11 band d-p model on a two-dimensional triangular lattice. Effects of the Coulomb interaction on a Co site: the intra- and inter-orbital direct terms U and U', the exchange coupling J and the pair-transfer J', are treated within the Hartree-Fock approximation. It is found that the metallic antiferromagnetism takes place below T_{c1} and, in addition, the orbital order accompanied by the small charge order takes place below T_{c2} (< T_{c1}) where the system becomes insulator. The obtained results are consistent with the successive phase transitions observed in Na_{0.5}CoO_{2}.

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