Ring-Exchange Interaction in Doubly Degenerate Orbital System
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概要
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The ring-exchange (RE) interaction in a Mott insulator with doubly degenerate e_{g} orbitals is studied. The Hamiltonian for the RE interaction is derived by a perturbational calculation. A remarkably weak RE interaction destroys the orbital order caused by the order-by-fluctuation mechanism in the nearest-neighbor exchange--interaction model. A magnetic octupole moment with long range order, i.e., complex orbital wave functions, appears. Competition between octupole and quadrupole interactions strongly suppresses the ordered moments.
- 2011-03-15
著者
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Ishihara Sumio
Department Of Applied Physics University Of Tokyo
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Nasu Joji
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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