Competition between Hund-Rule Coupling and Kondo Effect
Abstract
We investigate a problem about the competition between the hybridization and the Hund-rule coupling by applying the Wilson numerical renormalization-group method to the extended Kondo model where the impurity spin interacts via the Hund-rule coupling, with an extra spin which is isolated from the conduction electrons. It is shown that the Hund-rule coupling is an irrelevant perturbation against the strong coupling fixed point. However, the Hund-rule coupling decreases the characteristic energy drastically to the lower side and the irrelevant operator, which describes the low energy physics, takes a form of ferromagnetic exchange interaction between the extra spin and the Kondo resonance states because of the existence of the Hund-rule coupling.
Cite
@article{arxiv.cond-mat/9612108,
title = {Competition between Hund-Rule Coupling and Kondo Effect},
author = {Hiroaki Kusunose and Kazumasa Miyake},
journal= {arXiv preprint arXiv:cond-mat/9612108},
year = {2009}
}
Comments
5 pages, LaTeX, 5 figures in one PS file, Submitted to J. Phys. Soc. Jpn