Partial Disorder in the Periodic Anderson Model on a Triangular Lattice
Partial Disorder in the Periodic Anderson Model on a Triangular Lattice
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DOI：
10.1143/jpsj.80.073704
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发表时间：
2011-05
影响因子：
1.7
通讯作者：
S. Hayami;M. Udagawa;Y. Motome
中科院分区：
文献类型：
--
作者：
S. Hayami;M. Udagawa;Y. Motome
我们报告我们的理论结果出现的部分无序状态在零温度和其详细性质的周期性安德森模型的三角形晶格在半填充。部分无序态的特征在于在未阻挫的蜂窝状子网络上共线反铁磁有序和在其余位置的无序态共存。这种状态出现在非共线反铁磁金属和近藤绝缘体之间的电荷间隙的开放，而杂化和库仑排斥的变化。我们还发现了一个特征交叉的低能量激发光谱的结果，磁序和超晶格的共存。结果表明，即使在自旋各向异性不存在的情况下，也能明显观察到部分无序态，这与Kondo晶格模型中的部分Kondo屏蔽态形成了鲜明的对比.
We report our theoretical results on the emergence of a partially disordered state at zero temperature and its detailed nature in the periodic Anderson model on a triangular lattice at half-filling. The partially disordered state is characterized by the coexistence of a collinear antiferromagnetic order on an unfrustrated honeycomb subnetwork and nonmagnetic state at the remaining sites. This state appears with the opening of a charge gap between a noncollinear antiferromagnetic metal and Kondo insulator while the hybridization and Coulomb repulsion are changed. We also find a characteristic crossover in the low-energy excitation spectrum as a result of the coexistence of magnetic order and nonmagnetic sites. The result demonstrates that the partially disordered state is observed distinctly even in the absence of spin anisotropy, in marked contrast to the partial Kondo screening state found in the previous study for the Kondo lattice model.