A Modified Mean Field Theory for Spin Systems with Orbital Degeneracy中国物理快报：英文版论文
【题名】：A Modified Mean Field Theory for Spin Systems with Orbital Degeneracy中国物理快报：英文版论文(A Modified Mean Field Theory for Spin Systems with Orbital DegeneracyZhongGuoWuLiKuaiBao：YingWenBanLunWen) 【关键词】：LaMnO3 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 【keywords】：LaMnO3 MengSuanZuo XuanZhuanTiXi GuiDaoTuiHua XiuZhengJunZhiYuLiLun HundXiangHuZuoYong CiXing 【作者】：SHIDa-Ning      【来源】： 知识词典 【期刊名称】：中国物理快报：英文版(ZhongGuoWuLiKuaiBao：YingWenBan) 【国际标准刊号】：0256-307X        【国内统一刊号】：11-1959 【作者单位】：CollegeofScience,NanjingUniveristyofAeronauticsandAstronautics,Nanjing210016(CollegeofScience,NanjingUniveristyofAeronauticsandAstronautics,Nanjing210016) 【分类号】：O614.331 O482.5      【页码】：-735-737      【出版年】：2003.5 【下载地址】：下载pdf全文         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 flavour 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.
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