Non-magnetic impurities in two- and three- dimensional Heisenberg antiferromagnets

Details Non-magnetic impurities in two- and three- dimensional Heisenberg antiferromagnets Non-magnetic impurities in two- and three- dimensional Heisenberg antiferromagnets

1996-07-30

arxiv.org/abs/cond-mat/9607213v1

Physics

Condensed Matter

Latex file

Scientific paper

10.1103/PhysRevB.54.11921

In this paper we study in a large-S expansion effects of substituting spins by non-magnetic impurities in two- and three- dimensional Heisenberg antiferromagnets in a weak magnetic field. In particular, we demonstrate a novel mechanism where magnetic moments are induced around non-magnetic impurities when magnetic field is present. As a result, Curie-type behaviour in magnetic susceptibility can be observed well below the Neel temperature, in agreement with what is being observed in $La_2Cu_{1-x}Zn_{x}O_4$ and $Sr(Cu_{1-x}Zn_x)_2O_3$ compounds.

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