Susceptibilities and Spin Gaps of Weakly-coupled Spin Ladders
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 Jperp in the asymptotic limit |Jperp|/J -> 0. Furthermore, we examine the existence of logarithmic corrections to the linear scaling of the gap with |Jperp|.
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