Local magnetic structure due to inhomogeneity of interaction inS=12antiferromagnetic chains

Abstract

We study the magnetic properties of $S=1/2\mathrm{}$ antiferromagnetic Heisenberg chains with inhomogeneity of interaction. Using a quantum Monte Carlo method and an exact diagonalization method, we study the bond-impurity effect in the uniform $S=1/2\mathrm{}$ chain. Here “bond impurity” means a bond with a strength different from those in the bulk. In particular, by calculating the local magnetization, the local susceptibility, and the local field susceptibility, the temperature dependence of local magnetic structures induced by bond impurities is investigated. We also investigate the force acting between bond impurities and find that the force is attractive.