Regensburg 2007 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Finite size effects at phase transitions I (session accompanying the symposium of the same name)
DY 19.2: Vortrag
Dienstag, 27. März 2007, 17:15–17:30, H2
Finite-size effects in anisotropic antiferromagnets — •Martin Holtschneider1, Walter Selke1, and Stefan Wessel2 — 1Institut für Theoretische Physik, RWTH Aachen — 2Institut für Theoretische Physik, Universität Stuttgart
Square lattice Heisenberg antiferromagnets with an uniaxial anisotropy display, when applying a field parallel to the easy axis, antiferromagnetic, spin-flop, and paramagnetic phases. In particular, the transition region of the two ordered phases is studied carefully, using Monte Carlo simulations both in the classical and the spin-1/2 quantum version of the model. Finite-size analyses are found to play an essential role in investigating that region. We also present results on the closely related classical anisotropic XY antiferromagnet on a square lattice.