Non-magnetic impurities in S=1/2 spin-Peierls system and Heisenberg ladder systems

Tai-Kai Ng

Non-magnetic impurities in S=1/2 spin-Peierls system and Heisenberg ladder systems

Condensed Matter 2007-05-23 v1

Authors: Tai-Kai Ng

Abstract

In this paper we study the effect of non-magnetic impurities in spin-Peierls system $CuGeO_3$ within the framework of non-linear sigma model plus topological term. We show that local moments are induced in both the $Zn$ -doped and $Si$ -doped $CuGeO_3$ compounds. Effective low energy theories for the impurity-induced local moments are derived in both cases where interesting differences between the two cases and between the $Zn$ -doped Heisenberg two-ladder system are pointed out. The low-energy physics of the $Zn$ -doped Heisenberg three-leg ladder system is also discussed.

Keywords

non-magnetic impurities spin-Peierls system Heisenberg ladder local moments non-linear sigma model CuGeO3

Cite

@article{arxiv.cond-mat/9610016,
  title  = {Non-magnetic impurities in S=1/2 spin-Peierls system and Heisenberg ladder systems},
  author = {Tai-Kai Ng},
  journal= {arXiv preprint arXiv:cond-mat/9610016},
  year   = {2007}
}

Comments

11 pages, Latex file, no figure

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