Quantum Melting of Magnetic Order due to Orbital Fluctuations
Louis Felix Feiner (1), Andrzej M. Oles (2), Jan Zaanen (3) ((1), Philips Research Laboratories, Eindhoven, (2) Max-Planck-Institut FKF,, Stuttgart, (3) Institute Lorentz, Leiden University)
TL;DR
This paper investigates how orbital fluctuations in a 3D perovskite lattice lead to quantum melting of magnetic order, revealing a new spin liquid phase with a valence bond ground state.
Contribution
It demonstrates that orbital degeneracy enhances quantum fluctuations, resulting in a novel three-dimensional spin liquid state not previously observed.
Findings
Orbital degeneracy suppresses classical magnetic order.
Identification of a three-dimensional valence bond spin liquid.
Quantum fluctuations induce a phase transition near the multicritical point.
Abstract
We have studied the phase diagram and excitations of the spin-orbital model derived for a three dimensional perovskite lattice, as in KCuF_3. The results demonstrate that the orbital degeneracy drastically increases quantum fluctuations and suppresses the classical long-range order near the multicritical point in the mean-field phase diagram. This generates a qualitatively new spin liquid, providing the first example of a valence bond ground state in three dimensions.
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