SU(4) Theory for Spin Systems with Orbital Degeneracy

Details SU(4) Theory for Spin Systems with Orbital Degeneracy SU(4) Theory for Spin Systems with Orbital Degeneracy

1998-04-15

arxiv.org/abs/cond-mat/9804157v1

Phys. Rev. Lett. 80 (1998) 3527

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 2 figures. submitted to PRL

Scientific paper

10.1103/PhysRevLett.81.3527

The isotropic limit of spin systems with orbital degeneracy is shown to have
global SU(4) symmetry. On many 2D lattices, the ground state does not posses
long range order, which may explain the observed spin liquid properties of
$LiNiO_2$. In the SU(4) Neel ordered state, spin-spin correlations can be
antiferromagneitc between two neighboring sites with parallel magnetic moments.

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