Abstract
Fermionization of the spin operators is allowed only in the restricted Hilbert space of singly occupied sites. A method to implement this single-site occupancy constraint is applied to the frustrated Heisenberg model. This method allows us to study either magnetic or nonmagnetic phases at finite temperatures. A quantitative estimate of the relative weight of quantum fluctuations around the disordered dimer phases and the antiferromagnetic phase is given.
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