Mixed Heisenberg chains: I. The ground-state problem
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.
Journal of Physics Condensed Matter
- Pub Date:
- October 1997
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Statistical Mechanics
- 7 pages, RevTeX, 4 embedded eps figures, final version