Successive Phase Transitions in Na_{0.5}CoO_{2} based on the Triangular Lattice d-p Model
| dc.creator | Yamakawa, Youichi | |
| dc.creator | Ōno, Yoshiaki | |
| dc.date | 2008-10-14 | |
| dc.date.accessioned | 2026-07-07T10:09:53Z | |
| dc.date.available | 2026-07-07T10:09:53Z | |
| dc.description | 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}. | |
| dc.description | 4 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/0810.2380 | |
| dc.identifier | http://arxiv.org/abs/0810.2380 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/171461 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Successive Phase Transitions in Na_{0.5}CoO_{2} based on the Triangular Lattice d-p Model | |
| dc.type | text |