Influence of rare regions on quantum phase transition in antiferromagnets with hidden degrees of freedom

摘要

The effects of rare regions on the critical properties of quantumantiferromagnets with hidden degrees of freedom within the renormalizationgroup is discussed. It is shown that for ``constrained'' systems the stabilityrange on the phase diagram remains the same as in the mean-field theory whilefor ``unconstrained'' systems the stability range is effectively decreased.