Spin-Orbital Entanglement and Violation of the Goodenough-Kanamori Rules

Details Spin-Orbital Entanglement and Violation of the Goodenough-Kanamori Rules Spin-Orbital Entanglement and Violation of the Goodenough-Kanamori Rules

2006-04-18

arxiv.org/abs/cond-mat/0604417v1

Phys. Rev. Lett. 96, 147205 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.96.147205

We point out that large composite spin-orbital fluctuations in Mott insulators with $t_{2g}$ orbital degeneracy are a manifestation of quantum entanglement of spin and orbital variables. This results in a dynamical nature of the spin superexchange interactions, which fluctuate over positive and negative values, and leads to an apparent violation of the Goodenough-Kanamori rules. [{\it Published in Phys. Rev. Lett. {\bf 96}, 147205 (2006).}]

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