Quasi-Kondo Phenomenon due to Dynamical Jahn-Teller Effect

Abstract

A mechanism of non-magnetic Kondo effect is proposed on the basis of a multiorbital Anderson model coupled with dynamical Jahn-Teller (JT) phonons. An electron system coupled dynamically with JT phonons has a vibronic ground state with double degeneracy due to clockwise and anti-clockwise rotational modes with entropy of $\log 2$. When a temperature is lower than a characteristic energy to turn the rotational direction, the rotational degree of freedom is eventually suppressed and the corresponding entropy $\log 2$ is released, leading to quasi-Kondo behavior. We discuss possible relevance of this quasi-Kondo phenomenon to electronic properties of filled skutterudites.

4 pages, 3 figures

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• Effect of Rattling Phonons on Sommerfeld Constant
• Coupling Between An Optical Phonon and the Kondo Effect
• Theory of Defect-Induced Kondo Effect in Graphene: Numerical Renormalization Group Study
• Enhanced Kondo Effect in an Electron System Dynamically Coupled with Local Optical Phonon
• Two-channel Kondo physics due to As vacancies in the layered compound ZrAs1.58Se0.39
• Strong-Coupling Theory of Rattling-Induced Superconductivity
• Multipole Susceptibility of Multiorbital Anderson Model Coupled with Jahn-Teller Phonons
• Multipole State of Heavy Lanthanide Filled Skutterudites
• Attractive Su-Schrieffer-Heeger-Hubbard Model on a Square Lattice Away from Half-Filling
• Cooperative Effect of Coulomb Interaction and Electron-Phonon Coupling on the Heavy Fermion State in the Two-Orbital Periodic Anderson Model
• Enhancing the conductance of a two-electron nanomechanical oscillator
• Bosonization approach to the mixed-valence two-channel Kondo problem
• Microscopic Aspects of Multipole Properties of Filled Skutterudites
• Heavy-Electron Formation and Bipolaronic Transition in the Anharmonic Holstein Model
• Multipole as $f$-Electron Spin-Charge Density in Filled Skutterudites
• Electric Dipolar Susceptibility of the Anderson-Holstein Model
• Phase diagram of Holstein-Kondo lattice model at half-filling
• Kondo Effect of a Jahn-Teller Ion Vibrating in a Cubic Anharmonic Potential
• Elemental Dilution Effect on the Elastic Response due to a Quadrupolar Kondo Effect of the Non-Kramers System Y${}_{1-x}$Pr${}_x$Ir${}_2$Zn${}_{20}$
• Chaos in Jahn-Teller Rattling
• Manifestations of fine features of the density of states in the transport properties of KOs2O6