Susceptibilities and Spin Gaps of Weakly-coupled Spin Ladders

TL;DR

This paper investigates the magnetic susceptibilities and spin gaps in weakly-coupled two-chain spin-1/2 Heisenberg ladders using Monte Carlo simulations, revealing independence from coupling sign and exploring logarithmic corrections.

Contribution

It provides new insights into the behavior of susceptibilities and spin gaps in weakly-coupled spin ladders, including the independence from coupling sign and the nature of logarithmic corrections.

Findings

Susceptibilities and spin gaps are independent of the sign of inter-chain coupling in the asymptotic limit.

Logarithmic corrections to the linear scaling of the gap with coupling strength are examined.

Monte Carlo simulations effectively analyze magnetic properties of 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 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|.