Group theoretical classification of doubly degenerate orbital systems on a triangular lattice

On the basis of a group theoretical theory we have classified the mean field solutions of an eg degenerate Hubbard model on a two dimensional triangular lattice. For the crystal structure we have assumed a space group R\\bar3m, which is associated with NaNiO2, LiNiO2 and so on. As the ordering vecto...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2004-09, Vol.73 (9), p.2523-2532
Main Authors: MASAGO, Akira, SUZUKI, Naoshi
Format: Article
Language:English
Subjects:
Band and itinerant models
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory and models of magnetic ordering
Magnetic properties and materials
Physics
Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
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Summary:On the basis of a group theoretical theory we have classified the mean field solutions of an eg degenerate Hubbard model on a two dimensional triangular lattice. For the crystal structure we have assumed a space group R\\bar3m, which is associated with NaNiO2, LiNiO2 and so on. As the ordering vector we have assumed two vectors which correspond to M and K points, respectively, in the first Brillouin zone. We have obtained seventeen kinds of broken symmetry states in total. Those include the triangle arrangements of spin or orbital and the novel state related to magnetic octupole states as well as ordinary ferro-magnetic and orbital ordered states.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.73.2523