A modified Decoupled Cell Method (mDCM) for quantum Monte Carlo simulation is proposed to remove the difficulty in the Decoupled Cell Method (DCM), which causes a negative specific heat and an unexpected sudden increase of a susceptibility in a low temperature region. In one-dimensional XY-model (s = 1/2), the results obtained by mDCM were shown not to have any negative specific heat and for the susceptibility along z-axis, gave fairly good agreement with the exact one.
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Miyazawa et al. (1993) studied this question.
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