Abstract
We study antiferromagnetic spin-½ Heisenberg ladders, comprised of chains () with ratio of inter-chain to intra-chain couplings. The correlation length is deduced from measurements of the correlation function. For even , the static structure factor exhibits a peak at a temperature below the corresponding spin gap. Results for isotropically coupled ladders () are compared to those for the single chain and the square lattice. For , the correlation function of the two-chain ladder is in excellent agreement with analytic results from conformal field theory, and exhibits simple scaling behavior.
- Received 6 May 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.1865
©1996 American Physical Society