Susceptibilities and Spin Gaps of Weakly-coupled Spin Ladders
arXiv:cond-mat/0310714 · doi:10.1103/PhysRevB.69.092408
Abstract
We calculate the uniform and staggered susceptibilities of two-chain spin-1/2 Heisenberg ladders using Monte-Carlo simulations. We show that the gap extracted from the uniform susceptibility and the saturation value of the staggered susceptibility are independent of the sign of the inter-chain coupling J_perp in the asymptotic limit |J_perp|/J -> 0. Furthermore, we examine the existence of logarithmic corrections to the linear scaling of the gap with |J_perp|.
3 pages, 3 figures; reference added, minor changes
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