A Modified Mean Field Theory for Spin Systems with Orbital Degeneracy
SHI Da-Ning
College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016
A Modified Mean Field Theory for Spin Systems with Orbital Degeneracy
SHI Da-Ning
College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016
关键词 ：
75.10.Jm ,
11.30.-j
Abstract ： In order to understand the ground state of spin systems with orbital degeneracy, we present a modified mean-field theory that includes four order parameters. Our mean-field results suggest that for a small Hund interaction, the flavor liquid state is still stable against the solid state, but long-range orders may be attained in the system with sufficient deviation from the SU(4) limit. Finally, the implications for the experimental observations on the system LaMnO3 are discussed.
Key words ：
75.10.Jm
11.30.-j
出版日期: 2003-05-01
:
75.10.Jm
(Quantized spin models, including quantum spin frustration)
11.30.-j
(Symmetry and conservation laws)
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2003, Vol. 20 
