Theory of Charge Kondo Effect on Pair Hopping Mechanism

Abstract

A new microscopic model of the charge Kondo effect is proposed, and is studied on the basis of a numerical renormalization group calculations. It is shown that the charge Kondo effect is caused by a pair hopping interaction between the conduction band and the localized band. It is found that the formation of a charge Kondo-Yosida singlet due to its mechanism corresponds to the appearance of valence skipping phenomenon, and that the charge Kondo-Yosida singlet and the spin Kondo-Yosida singlet state coexist for a tuned parameter set, because the charge and spin degrees of freedom are separated in this model. Then, it is also found that the Sommerfeld coefficient is enhanced by the competition between these two singlet states.

4 pages, 5 figures, Accepted for publication in J. Phys. Soc. Jpn

References in corpus (3)

• The numerical renormalization group method for quantum impurity systems
• Madelung Energy of the Valence Skipping Compound BaBiO${}_3$
• Charge Kondo anomalies in PbTe doped with Tl impurities

Cited by in corpus (6)

• Valence fluctuations in Sn(Pb)${}_2$P${}_2$S${}_6$ ferroelectrics
• Evidence of incoherent carriers associated with resonant impurity levels and their influence on superconductivity in the anomalous superconductor Pb${}_{1-x}$Tl${}_x$Te
• Photoinduced $\eta$ pairing in the Kondo lattice model
• Phase separation of superconducting phases in the Penson-Kolb-Hubbard model
• Anomalous ^{125}Te Nuclear Spin Relaxation Coincident with Charge Kondo Behavior in Superconducting Pb_{1-x}Tl_{x}Te
• Charge Kondo Effect and Superconductivity in the Falikov-Kimball model with the Pair Hopping