Phys. Rev. Lett. 81, 3527–3530 (1998)

SU(4) Theory for Spin Systems with Orbital Degeneracy

Abstract

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Y. Q. Li^1,2, Michael Ma¹, D. N. Shi^1,3, and F. C. Zhang¹
¹Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221
²Department of Physics, Zhejiang University, Hangzhou, China
³College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, China

Received 15 April 1998; published in the issue dated 19 October 1998

The isotropic limit of spin systems with orbital degeneracy has global SU(4) symmetry. On many 2D lattices, the ground state does not possess long-range order, which may explain the observed spin liquid properties of LiNiO₂. In the SU(4) Néel-ordered state, spin-spin correlations can be antiferromagnetic between two neighboring sites with parallel magnetic moments.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.81.3527

DOI:

10.1103/PhysRevLett.81.3527

PACS:

75.10.Jm, 11.30.-j

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Phys. Rev. Lett. 81, 3527–3530 (1998)

SU(4) Theory for Spin Systems with Orbital Degeneracy