We study antiferromagnetic spin-{} Heisenberg ladders, comprised of nc chains (2≤nc≤6) with ratio J_⊥J_∥ of inter-chain to intra-chain couplings. The correlation length ξ(T) is deduced from measurements of the correlation function. For even nc, the static structure factor exhibits a peak at a temperature below the corresponding spin gap. Results for isotropically coupled ladders (J_⊥J_∥=1) are compared to those for the single chain and the square lattice. For J_⊥J_∥≤0.5, the correlation function of the two-chain ladder is in excellent agreement with analytic results from conformal field theory, and ξ(T) exhibits simple scaling behavior.
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Greven et al. (1996) studied this question.
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