Ground state and elementary excitations in the one-dimensional f2 Kondo lattice model

S. Watanabe, Yoshio Kuramoto

Research output: Contribution to journalConference articlepeer-review

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 the reduction of the characteristic energy scale. 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. The attractive force among conduction electrons is induced by the competition and a bound electron pair is formed. Off half-filling, the spin gap remains but the charge gap is closed. This constitutes a new mechanism of superconductivity in multi-orbital systems. For small J/I an effective model is derived by perturbation theory and is studied by bosonization and scaling theory.

Original languageEnglish
Pages (from-to)260-261
Number of pages2
JournalPhysica B: Condensed Matter
Volume281-282
DOIs
Publication statusPublished - 2000 Jun 1
EventYamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn
Duration: 1999 Aug 241999 Aug 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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