Local magnetic structure due to inhomogeneity of interaction in S=1/2 antiferromagnetic chain

Details Local magnetic structure due to inhomogeneity of interaction in S=1/2 antiferromagnetic chain Local magnetic structure due to inhomogeneity of interaction in S=1/2 antiferromagnetic chain

1999-06-29

arxiv.org/abs/cond-mat/9906426v1

Physics

Condensed Matter

Statistical Mechanics

15pages, 34figures

Scientific paper

10.1103/PhysRevB.61.4033

We study the magnetic properties of $S=1/2$ antiferromagnetic Heisenberg chains with inhomogeneity of interaction. Using a quantum Monte Carlo method and an exact diagonalization method, we study bond-impurity effect in the uniform $S=1/2$ chain and also in the bond-alternating chain. Here `bond impurity' means a bond with strength different from those in the bulk or a defect in the alternating order. Local magnetic structures induced by bond impurities are investigated both in the ground state and at finite temperatures, calculating the local magnetization, the local susceptibility and the local field susceptibility. We also investigate the force acting between bond impurities and find the force generally attractive.

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