Bond-versus-site doping models for off-chain-doped Haldane-gap system Y$_2$ Ba Ni O$_5$
Strongly Correlated Electrons
2009-10-31 v1
Abstract
Using the density matrix renormalization-group technique, we calculate the impurity energy levels for two different effective models of off-chain doping for quasi-one-dimensional Heisenberg chain compound Y Ba Ni O: ferromagnetic bond doping and antiferromagnetic site spin-1/2 doping. Thresholds of the impurity strength for the appearance of localized states are found for both models. However, the ground-state and low-energy excitations for weak impurity strength are different for these two models and the difference can be detected by experiments.
Cite
@article{arxiv.cond-mat/9811084,
title = {Bond-versus-site doping models for off-chain-doped Haldane-gap system Y$_2$ Ba Ni O$_5$},
author = {Jizhong Lou and Shaojin Qin and Zhaobin Su and Lu Yu},
journal= {arXiv preprint arXiv:cond-mat/9811084},
year = {2009}
}
Comments
5 pages, 5 eps figures included, to be published in Phys. Rev. B