Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Poster Session I
DY 6.55: Poster
Monday, March 22, 2010, 16:00–18:00, Poster B2
Heisenberg antiferromagnets with exchange and on-site anisotropies — •Thanh-Chung Dinh1, Reinhard Folk1, David Peters2, and Walter Selke2 — 1Institut für Theoretische Physik, JKU Linz, Austria — 2Institut für Theoretische Physik, JARA-SIM and RWTH Aachen, Germany
We study Heisenberg antiferromagnets in a field with exchange and quadratic as well as quartic on-site anisotropies. Using, especially ground state considerations and Monte Carlo techniques for classical magnets on cubic lattices, we determine generic phase diagrams comprising antiferromagnetic, spin-flop, biconical, and paramagnetic phases. A variety of critical and multicritical scenarios are elucidated. Our results are compared to findings on related classical and quantum anisotropic antiferromagnets in lower dimensions.
Supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung, project No. 19583-N20, and by the excellence initiative of the German federal and state governments.
References: [1] G. Bannasch and W. Selke, Eur. Phys.J. B69, 439 (2009); [2] R. Folk, Yu, Holovatch, and G. Moser, Phys. Rev.E78, 041124 (2008); [3] T.-C. Dinh and R. Folk, J. Physical Studies (2009, in print); [4] W. Selke, G. Bannasch, M. Holtschneider, I. P. McCulloch, D. Peters, and S. Wessel, Cond. Mat. Phys., Vol. 12 (4) (2009, in print).