Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-04-21
Phys. Rev. Lett. 80, 5196 (1998)
Physics
Condensed Matter
Statistical Mechanics
5 pages, Revtex, 4 PostScript figures included
Scientific paper
10.1103/PhysRevLett.80.5196
We present results of extensive quantum Monte Carlo simulations of the three-dimensional (3D) S=1/2 Heisenberg antiferromagnet. Finite-size scaling of the spin stiffness and the sublattice magnetization gives the critical temperature Tc/J = 0.946 +/- 0.001. The critical behavior is consistent with the classical 3D Heisenberg universality class, as expected. We discuss the general nature of the transition from quantum mechanical to classical (thermal) order parameter fluctuations at a continuous Tc > 0 phase transition.
Sandvik Anders. W.
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