Orbital Correlations in Monolayer Manganites - From Spin t-J Model to Orbital t-J Model |
| M. Daghofera and A.M. Oleśa, b
aMax-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany bMarian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland |
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| Received: 14 09 2006; |
| On the example of monolayer manganites we show that the theoretical ideas developed long ago along the derivation of the spin t-J model from the Hubbard model are nowadays very helpful in strongly correlated oxides with partly filled degenerate orbitals. We analyze a realistic orbital t-J model for eg electrons in La1-xSr1+xMnO4 monolayer manganites, and discuss the evolution of spin and orbital correlations under increasing doping by performing exact diagonalization of finite clusters, with electronic kinetic energy determined self-consistently at a finite temperature by classical Monte Carlo for t2g spins. Several experimental results are reproduced. |
| DOI: 10.12693/APhysPolA.111.497 PACS numbers: 75.10.Jm, 75.30.Et, 75.47.Lx |