Phys. Rev. Lett. 78, 2799–2802 (1997)Quantum Melting of Magnetic Order due to Orbital FluctuationsReceived 27 November 1996; published in the issue dated 7 April 1997 We have studied the phase diagram and excitations of the spin-orbital model derived for a three-dimensional perovskite lattice, as in KCuF3. 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 indicates the presence of a quantum liquid state, and we present explicit evidence for valence bond type correlations in three dimensions. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.2799
DOI:
10.1103/PhysRevLett.78.2799
PACS:
71.27.+a, 75.10.-b, 74.72.-h, 75.30.Et
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