Danu, B.; BrijeshKumar; Pai, R.V.
(EPL - Europhysics Letters. 100(2); 2012; Article ID: 27003.)
We study a class of one-dimensional antiferromagnetic quantum spin-1/2 models using DMRG. The exchange interaction in these models decreases linearly with the separation between the spins, J(ij) = R - vertical bar i-j ...