Group Theoretical Classification of Doubly Degenerate Orbital Systems on a Triangular Lattice(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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On the basis of a group theoretical theory we have classified the mean field solutions of an e_g degenerate Hubbard model on a two dimensional triangular lattice. For the crystal structure we have assumed a space group R3^^-m, which is associated with NaNiO_2, LiNiO_2 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.
- 2004-09-15
著者
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Suzuki Naoshi
Graduate School Of Engineering Science Osaka University
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Masago Akira
Graduate School Of Engineering Science Osaka University
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