A Modified Mean Field Theory for Spin Systems with Orbital Degeneracy

作     者：SHIDa-Ning 

作者机构：CollegeofScienceNanjingUniveristyofAeronauticsandAstronauticsNanjing210016 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2003年第20卷第5期

页      面：735-737页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0704[理学-天文学] 070301[理学-无机化学] 0702[理学-物理学] 

主　　题：LaMnO_3 锰酸镧 旋转体系 轨道退化 修正均值域理论 Hund相互作用 磁性 

摘      要：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.