Mixed Heisenberg Chains. I. The Ground State Problem
arXiv:cond-mat/9703206 · doi:10.1088/0953-8984/9/42/017
Abstract
We consider a mechanism for competing interactions in alternating Heisenberg spin chains due to the formation of local spin-singlet pairs. The competition of spin-1 and spin-0 states reveals hidden Ising symmetry of such alternating chains.
7 pages, RevTeX, 4 embedded eps figures, final version