Phase Diagram of Spin-Orbital Model |
| A.M. Oleś Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland and Max-Planck-Institut FKF, Heisenbergstrasse 1, 70569 Stuttgart, Germany L.F. Feiner Philips Research Laboratories, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands and J. Zaanen Institute Lorentz, Leiden University, P.O.B. 9506, 2300 RA Leiden, The Netherlands |
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| We show that the mean-field phase diagram of the realistic spin-orbital model derived for a perovskite lattice in three dimensions consists of four different classical magnetic phases which become degenerate at orbital degeneracy. The quantum fluctuations are drastically enhanced and suppress the classical long-range order, providing a new mechanism to stabilize a quantum spin liquid near the multicritical point. |
| DOI: 10.12693/APhysPolA.92.367 PACS numbers: 75.10.Jm, 75.30.Et, 75.40.-s, 71.27.+a |