Quantum Monte Carlo Simulations of the Impurity-Induced Phase Transitions in Low-Dimensional Magnets

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We study the impurity-induced phase transitions in a quasi-one-dimensional Heisenberg antiferromagnet doped with magnetic spin-1/2 impurities and non-magnetic ones. The impurity-induced transition temperature determined by the quantum Monte Carlo method with the continuous-time loop algorithm is monotonically increasing as a function of the magnitude of the impurity spin. To these results, we give discussions based on the valence-bond solid-like picture for the pure system and the inspection of the local magnetic structure around the impurities.

5 pages, 4 eps figure files, manuscript for the proceedings of the 18th Annual Workshop "Recent Developments in Computer Simulation Studies in Condensed Matter Physics" held at the Center for Simulational Physics, University of Georgia, Athens, GA, USA, during March 7-11, 2005

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