Volume 57, Number 2, January 2002
|Page(s)||274 - 280|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Formation of energy gap in high-dimensional spin-orbital liquids
Department of Physics, the University of Hong Kong
Pokfulam Road, Hong Kong, PRC
2 Institute of Physics, Chinese Academy of Sciences P. O. Box 603, Beijing 100080, PRC
3 Center for Advanced Study, Tsinghua University Beijing 100084, PRC
Accepted: 2 November 2001
A Schwinger boson mean-field theory is developed for spin liquids in a symmetric spin-orbital model in higher dimensions. Spin, orbital and coupled spin-orbital operators are treated equally. We evaluate the dynamic correlation functions and collective excitations spectra. As the collective excitations have a finite energy gap, we conclude that the ground state is a spin-orbital liquid with a two-fold degeneracy, which breaks the discrete spin-orbital symmetry. Based on this conclusion, we propose that broken symmetry or symmetric frustration instead of geometric quantum frustration provides a new route to explore the spin liquid states. Possible relevence of this spin liquid state to several realistic systems, such as and , are discussed.
PACS: 75.10.-b – General theory and models of magnetic ordering
© EDP Sciences, 2002
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