Partial Disorder in the Periodic Anderson Model on a Triangular Lattice
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概要
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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.
- 2011-07-15
著者
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Motome Yukitoshi
Department Of Applied Physics University Of Tokyo
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Udagawa Masafumi
Department Of Applied Physics University Of Tokyo
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Hayami Satoru
Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
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Udagawa Masafumi
Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
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