The flavour liquid state and Hund's rule effects in spin systems with orbital degeneracy
Shi Da-Ning (施大宁)a)b) and Yang Zhi-Hong (杨志红)a
a College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; b Province Key Laboratory of Thin Film Material, Suzhou University, Suzhou 215006, China
Abstract In order to understand the properties of the spin system with orbital degeneracy, we first generalize the linearized semiclassical spin wave method for the SU(2) generators into the SU(4) case, and then investigate the elementary excitations of the orbital-spin systems in the SU(4) limit. The results show that, due to the reduction of the dimensionality of the excitations, the ordered state of the SU(4) spin-orbital model is unstable. Secondly, we study the effects of the Hund interaction on the flavour liquid state of the system. Our mean-field results suggest that, for a small Hund interaction, the flavour liquid state is still stable against the generalized spin-density wave state, but with sufficient deviation from the SU(4) limit, the long-range order may be attained in two-dimensional systems. Finally, the implications for the experimental observations on the material LiNiO2 are discussed.
Received: 11 March 2002
Revised: 07 April 2002
Accepted manuscript online:
Shi Da-Ning (施大宁), Yang Zhi-Hong (杨志红) The flavour liquid state and Hund's rule effects in spin systems with orbital degeneracy 2002 Chinese Physics 11 817
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