Spin, charge and quasi-particle gaps in the one-dimensional Kondo lattice with f2 configuration

Shinji Watanabe, Yoshio Kuramoto, Tomotoshi Nishino, Naokazu Shibata

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The ground state properties of the one-dimensional Kondo lattice with an f2 configuration at each site are studied by the density matrix renormalization group method. At half-filling, competition between the Kondo exchange J and the antiferromagnetic intra f-shell exchange I leads to reduction of energy gaps for spin, quasi-particle and charge excitations. The attractive force among conduction electrons is induced by the competition and the bound state is formed. As J/I increases the f2 singlet gives way to the Kondo singlet as the dominant local correlation. The remarkable change of the quasi-particle gap is driven by the change of the spin-1/2 excitation character from the itinerant one to the localized one. Possible metal-insulator transition is discussed which may occur as the ratio J/I is varied by reference to mean-field results in the f2 lattice system and the two impurity Kondo system.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
Journaljournal of the physical society of japan
Volume68
Issue number1
DOIs
Publication statusPublished - 1999 Jan

Keywords

  • Crystalline-electric-field singlet
  • Density matrix renormalization group
  • Heavy fermion
  • Kondo lattice
  • Kondo singlet
  • Two impurity system
  • f Kondo lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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