Charge order in a two-dimensional Kondo lattice model

The possibility of charge order is theoretically examined for the Kondo lattice model in two dimensions, which does not include bare repulsive interactions. Using two complementary numerical methods, we find that charge order appears at quarter filling in an intermediate Kondo coupling region. The c...

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Bibliographic Details
Published inPhysical review letters Vol. 110; no. 24; p. 246401
Main Authors Misawa, Takahiro, Yoshitake, Junki, Motome, Yukitoshi
Format Journal Article
LanguageEnglish
Published United States 14.06.2013
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Summary:The possibility of charge order is theoretically examined for the Kondo lattice model in two dimensions, which does not include bare repulsive interactions. Using two complementary numerical methods, we find that charge order appears at quarter filling in an intermediate Kondo coupling region. The charge ordered ground state is an insulator exhibiting an antiferromagnetic order at charge-poor sites, while the paramagnetic charge-ordered state at finite temperatures is metallic with pseudogap behavior. We confirm that the stability of charge order is closely related with the local Kondo-singlet formation at charge-rich sites. Our results settle the controversy on charge order in the Kondo lattice model in realistic spatial dimensions.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.110.246401