| For spin-1 quasi-one-dimensional antiferromagnets that have quantum disordered ground states, the effects of magnetic and non-magnetic impurities are investigated utilizing the quantum Monte Carlo method with the continuous-time loop algorithm. Impurity-induced transition temperatures are determined with respect to the concentration of host spins and the nature of the phase transition between the paramagnetic phase and the impurity-doped valence bond solid state is discussed. The qualitative differences between the species of impurities in the impurity-induced phase transitions are discussed by investigating the local magnetic structure around impurities. |
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