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SU(4) Theory for Spin Systems with Orbital Degeneracy

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arxiv cond-mat/9804157 v1 pith:GWNCLLTD submitted 1998-04-15 cond-mat.str-el

Y. Q. Li , Michael Ma , D. N. Shi , F. C. Zhang This is my paper · ORCID
classification cond-mat.str-el
keywords spindegeneracyorbitalstatesystemsantiferromagneitccorrelationsexplain
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abstract

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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