Spin Gap in a Doped Kondo Chain
Strongly Correlated Electrons
2009-10-30 v3 Superconductivity
Abstract
We show that the Kondo chain away from half-filling has a spin gap upon the introduction of an additional direct Heisenberg coupling between localized spins. This is understood in the weak-Kondo-coupling limit of the Heisenberg-Kondo lattice model by bosonization and in the strong-coupling limit by a mapping to a modified t-J model. Only for certain ranges of filling and Heisenberg coupling does the spin gap phase extend from weak to strong coupling.
Keywords
Cite
@article{arxiv.cond-mat/9702143,
title = {Spin Gap in a Doped Kondo Chain},
author = {Arnold E. Sikkema and Ian Affleck and Steven R. White},
journal= {arXiv preprint arXiv:cond-mat/9702143},
year = {2009}
}
Comments
4 pages RevTeX including 4 eps figures; minor corrections and clarifications