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We present results of extensive quantum Monte Carlo simulations of thethree-dimensional (3D) S=1/2 Heisenberg antiferromagnet. Finite-size scaling ofthe spin stiffness and the sublattice magnetization gives the criticaltemperature Tc/J = 0.946 +/- 0.001. The critical behavior is consistent withthe classical 3D Heisenberg universality class, as expected. We discuss thegeneral nature of the transition from quantum mechanical to classical (thermal)order parameter fluctuations at a continuous Tc > 0 phase transition.Comment: 5 pages, Revtex, 4 PostScript figures include

Critical Temperature and the Transition from Quantum to Classical Order Parameter Fluctuations in the Three-Dimensional Heisenberg Antiferromagnet