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Electron Correlation and Dynamical Jahn-Teller Effect in an Orbitally Degenerate System
Joji Nasu,Sumio Ishihara 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Motivated by recent experiments on Ba3CuSb2O9, we study the dynamical Jahn-Teller effect ina spin-orbital coupled system. We analyze a low-energy model Hamiltonian which includes thesuperexchange-type interaction and the Jahn-Teller interaction by using a combined method of themean-field approximation and the quantum Monte-Carlo simulation. We find that magnetic ordersdo not appear in a wide parameter region and that the spin-dimer state with an orbital order isrealized. The orbital order is strongly suppressed by the dynamical Jahn-Teller effect.