Quantum Critical Point in the Spin Glass-Kondo Transition in Heavy Fermion Systems
Strongly Correlated Electrons
2009-11-10 v1 Statistical Mechanics
Abstract
The Kondo-Spin Glass competition is studied in a theoretical model of a Kondo lattice with an intra-site Kondo type exchange interaction treated within the mean field approximation, an inter-site quantum Ising exchange interaction with random couplings among localized spins and an additional transverse field in the x direction, which represents a simple quantum mechanism of spin flipping. We obtain two second order transition lines from the spin-glass state to the paramagnetic one and then to the Kondo state. For a reasonable set of the different parameters, the two second order transition lines do not intersect and end in two distinct QCP.
Keywords
Cite
@article{arxiv.cond-mat/0404551,
title = {Quantum Critical Point in the Spin Glass-Kondo Transition in Heavy Fermion Systems},
author = {Alba Theumann and B. Coqblin},
journal= {arXiv preprint arXiv:cond-mat/0404551},
year = {2009}
}
Comments
20 pages; 1 figure; to appear in Physical Review B