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VOLUME 81 (2005) | ISSUE 5 | PAGE 297
Monte Carlo study of first-order transition in Heisenberg fcc antiferromagnet
Nearest-neighbor Heisenberg antiferromagnet on a face-centered cubic lattice is studied by extensive Monte Carlo simulations in zero magnetic field. The parallel tempering algorithm is utilized, which allows to overcome a slow relaxation of the magnetic order parameter and fully equilibrate moderate size clusters with up to N\simeq 7\cdot 10^3 spins. By collecting energy and order parameter histograms on clusters with up to N\simeq 2\cdot 10^4 sites we accurately locate the first-order transition point at Tc=0.4459(1)J.