Absence of effective spins 1/2 induced by nonmagnetic impurities in a class of low-dimensional magnets

Details Absence of effective spins 1/2 induced by nonmagnetic impurities in a class of low-dimensional magnets Absence of effective spins 1/2 induced by nonmagnetic impurities in a class of low-dimensional magnets

2001-09-05

arxiv.org/abs/cond-mat/0109095v1

Phys. Rev. B 65, 104411 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 10 figures

Scientific paper

10.1103/PhysRevB.65.104411

We show that doping a Majumdar--Ghosh chain with non-magnetic impurities does {\it not} produce almost free spins 1/2. The difference between this system and other spin liquids, such as unfrustrated spin ladders, is illustrated in the context of the general dimerized, frustrated spin chain. By detailed analysis of the excitation spectra of finite chains with two impurities, we investigate the evolution of the screening affecting impurity-induced free spins, and of the sign and magnitude of their effective interactions. We comment on a possible connection to impurity-doping experiments in CuGeO_3.

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