Crossover between Fermi liquid and non-Fermi liquid in orbitally degenerate Kondo systems

Hiroaki Kusunose, Yoshio Kuramoto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Entanglement of spin and orbital Kondo effect is investigated on the basis of a Kondo-type exchange model with twofold orbital degeneracy. By using Wilson's numerical renormalization-group method, we examine dynamical and thermal properties respecting the difference in time-reversal property of multipole operators. In the presence of particle-hole symmetry, the model has a new non-Fermi-liquid fixed point with a fractional entropy. The spectral intensity of the quadrupole susceptibility diverges in the zero-frequency limit, while the dipole susceptibility shows a Fermi-liquid-like behavior. This is understood by mapping to the two-channel Kondo model, in which the dipole moment is mapped onto the operators with the scaling dimension Δm = 1, while the quadrupole moment onto the operators with another scaling dimension Δe = 1/2. Even for a fairly particle-hole asymmetric case with the Fermi-liquid ground state, the non-Fermi-liquid behavior has significant influences in electric and thermal properties.

Original languageEnglish
Pages (from-to)3960-3965
Number of pages6
Journaljournal of the physical society of japan
Volume68
Issue number12
DOIs
Publication statusPublished - 1999 Dec

Keywords

  • CeLaB
  • LaSrMnO
  • Multi-channel Kondo effect
  • Multipole
  • Non-Fermi liquid
  • Numerical renormalization-group method
  • Orbital degeneracy
  • Time-reversal property

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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