The study of spin-spin correlations in quasi-one-dimensional Heisenberg antiferromagnetic clusters

摘要

For a class of quasi-one-dimensional clusters, by using exactdiagonalization, we study the effect of side spins on the spin-spincorrelations on chain. Our calculations show that the side spins added in thesame sublattice can effectively strengthen the spin-spin correlations in largedistance region and make the change tend to flat. It is exactly proved thatperiodically adding side spins can set up magnetic long-range orders in theground state. Also we investigate the effect of the density of side spins oncorrelation strength. The case that two sublattices have different localizedspins is discussed.