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arxiv: cond-mat/9701098 · v1 · submitted 1997-01-14 · ❄️ cond-mat.str-el

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) This is my paper
classification ❄️ cond-mat.str-el
keywords diagramfluctuationsorbitalorderphasequantumthreebond
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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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