Realization of Strong Coupling Fixed Point in Multilevel Kondo Models

Abstract

Impurity four- and six-level Kondo model, in which an ion is tunneling among four- and six-stable points and interacting with surrounding conduction electrons, are investigated by using the perturbative and numerical renormalization group methods. It is shown that purely orbital Kondo effects occur at low temperatures in these systems which are direct generalizations of the Kondo effect in the so-called two-level system. This result offers a good explanation for the enhanced and magnetically robust Sommerfeld coefficient observed in SmOs_4Sb_12 and some other filled-skutterudites.

3 pages, 3 figures, for proceedings of ASR-WYP-2005. To be published in Journal of Physical Society Japan supplement

References in corpus (4)

• Time-dependent Density-Matrix Renormalization-Group Methods
• Exotic Heavy-Fermion State in Filled Skutterudite SmOs4Sb12
• Heavy Fermion Behavior, Crystalline Electric Field Effects, and Weak Ferromagnetism in SmOs_{4}Sb_{12}
• Local Heavy Quasiparticle in Four-Level Kondo Model

Cited by in corpus (11)

• Low-lying optical phonon modes in the filled skutterudite CeRu4Sb12
• Effect of Rattling Phonons on Sommerfeld Constant
• Enhanced Kondo Effect in an Electron System Dynamically Coupled with Local Optical Phonon
• Theory of Ultrasonic Dispersion in Local Phonon Systems Coupled with Conduction Electrons
• Inverse Isotope Effect on Kondo Temperature in Electron-Rattling System
• Multipole Susceptibility of Multiorbital Anderson Model Coupled with Jahn-Teller Phonons
• Electron Mass Enhancement due to Anharmonic Local Phonons
• Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs${}_4$Sb${}_{12}$ and NdOs${}_4$Sb${}_{12}$
• Electric Dipolar Susceptibility of the Anderson-Holstein Model
• Kondo Effect of a Jahn-Teller Ion Vibrating in a Cubic Anharmonic Potential
• Chaos in Jahn-Teller Rattling