A Modified Mean Field Theory for Spin Systems with Orbital Degeneracy

Chin. Phys. Lett.

2003, Vol. 20

Issue (5): 735-737 DOI:

Original Articles

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

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SHI Da-Ning 2003 Chin. Phys. Lett. 20 735-737

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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.

Keywords: 75.10.Jm 11.30.-j

Published: 01 May 2003

PACS:	75.10.Jm	(Quantized spin models, including quantum spin frustration)
	11.30.-j	(Symmetry and conservation laws)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2003/V20/I5/0735

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