Kondo Effect in an Electron System with Dynamical Jahn-Teller Impurity

Details Kondo Effect in an Electron System with Dynamical Jahn-Teller Impurity Kondo Effect in an Electron System with Dynamical Jahn-Teller Impurity

2006-12-28

arxiv.org/abs/cond-mat/0612657v1

J. Phys. Soc. Jpn. 76, 023705 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

10.1143/JPSJ.76.023705

We investigate how Kondo phenomenon occurs in the Anderson model dynamically coupled with local Jahn-Teller phonons. It is found that the total angular moment composed of electron pseudo-spin and phonon angular moments is screened by conduction electrons. Namely, phonon degrees of freedom essentially contribute to the formation of singlet ground state. A characteristic temperature of the Kondo effect due to dynamical Jahn-Teller phonons is explained by an effective $s$-$d$ Hamiltonian with anisotropic exchange interaction obtained from the Jahn-Teller-Anderson model in a non-adiabatic region.

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