Non-Fermi-liquid states of a magnetic ion in a metal: Particle-hole symmetric case

Academic Article

Abstract

  • We solve a correlated single-impurity Hamiltonian, developed from a model for the copper oxides. It consists of the Anderson or Wolff Hamiltonian supplemented by finite-range interactions. These couple the impurity to additional screening channels of conduction electrons in a way that allows low-energy fluctuations of both spin and charge. We use Wilson's numerical renormalization-group technique supplemented by analytic results to show that as the screening interactions increase, the effective repulsion at the impurity site changes to attraction. In the particle-hole symmetric model studied here, the low-energy properties then change from a spin Kondo effect to a charge Kondo effect in which the impurity fluctuates between zero occupation and double occupation. As the screening interactions are further increased, this Kondo-effect-Fermi-liquid ground state gives way to a critical line of non-Fermi-liquid states, through a Kosterlitz-Thouless-type transition. © 1994 The American Physical Society.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Perakis IE; Varma CM
  • Start Page

  • 9041
  • End Page

  • 9051
  • Volume

  • 49
  • Issue

  • 13