FORMATION OF LOCAL MOMENT NEAR A STATIC VACANCY IN THE ONE-DIMENSIONAL LARGE-U HUBBARD-MODEL

The effect of non-magnetic impurities in the one-dimensional large-U H ubbard model has been studied. For a single non-magnetic scatterer, it is shown that a bound state is obtained which is due to the singular behaviour of the T-matrix. It has been argued that the bound state whi ch yields a delta-function density oi states might correspond to local moment in the system giving rise to Curie-like contribution to the su sceptibility. The spatial dependence of the impurity state wave functi on is shown to follow an algebraic decay. Its possible relevance to so me recently discovered one-dimensional antiferromagnets has been discu ssed.