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VOLUME 81 | ISSUE 5 | PAGE 297 Monte Carlo study of first-order transition in Heisenberg fcc antiferromagnet M. V. Gvozdikova, M. E. Zhitomirsky* Grenoble High Magnet Field Laboratory, CNRS, 38042 Grenoble, France and Department of Physics, Kharkov National University, 61077 Kharkov, Ukraine *Commissariat à l'Energie Atomique, DSM/DRFMC/SPSMS, 38054 Grenoble, France PACS: 75.10.Jm, 75.50.Ee Abstract 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 spins. By collecting energy and order parameter histograms on clusters with up to sites we accurately locate the first-order transition point at Tc=0.4459(1)J. Download PS file (GZipped, 158.7K)  |  Download PDF file (275.1K)