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Takahiro Misawa1, Junki Yoshitake1, Yukitoshi Motome1

  • 1Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Physical Review Letters
|August 29, 2014
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Charge order emerges in the two-dimensional Kondo lattice model without direct repulsion. This insulating, antiferromagnetic state at low temperatures transitions to a metallic, pseudogap state at higher temperatures, linked to Kondo-singlet formation.

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Area of Science:

  • Condensed matter physics
  • Theoretical physics
  • Materials science

Background:

  • The Kondo lattice model describes interacting electrons and localized magnetic moments.
  • Understanding charge order is crucial for predicting material properties.
  • Previous studies lacked consensus on charge order in 2D Kondo lattice models without direct repulsion.

Purpose of the Study:

  • To theoretically investigate the emergence of charge order in the 2D Kondo lattice model.
  • To clarify the conditions and characteristics of charge order in this model.
  • To resolve existing controversies regarding charge order in realistic spatial dimensions.

Main Methods:

  • Theoretical examination of the 2D Kondo lattice model.
  • Application of two complementary numerical methods.
  • Analysis of ground state and finite-temperature properties.

Main Results:

  • Charge order appears at quarter filling in an intermediate Kondo coupling regime.
  • The ground state is an insulator with antiferromagnetic order at charge-poor sites.
  • The finite-temperature state is a paramagnet, metallic with pseudogap behavior.
  • Charge order stability correlates with local Kondo-singlet formation at charge-rich sites.

Conclusions:

  • Charge order is a robust feature of the 2D Kondo lattice model under specific conditions.
  • The interplay between Kondo coupling and electron filling drives charge ordering.
  • This work resolves long-standing debates on charge order in this model system.