Classical dimers and dimerized superstructure in orbitally degenerate honeycomb antiferromagnet

Details Classical dimers and dimerized superstructure in orbitally degenerate honeycomb antiferromagnet Classical dimers and dimerized superstructure in orbitally degenerate honeycomb antiferromagnet

2008-02-19

arxiv.org/abs/0802.2692v2

Phys. Rev. Lett. 100, 147203 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.147203

We discuss the ground state of the spin-orbital model for spin-one ions with partially filled $t_{2g}$ levels on a honeycomb lattice. We find that the orbital degrees of freedom induce a spontaneous dimerization of spins and drive them into nonmagnetic manifold spanned by hard-core dimer (spin-singlet) coverings of the lattice. The cooperative ``dimer Jahn-Teller'' effect is introduced through a magnetoelastic coupling and is shown to lift the orientational degeneracy of dimers leading to a peculiar valence bond crystal pattern. The present theory provides a theoretical explanation of nonmagnetic dimerized superstructure experimentally seen in Li$_2$RuO$_3$ compound at low temperatures.

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