Dresden 2011 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 40: Posters II
DY 40.31: Poster
Donnerstag, 17. März 2011, 17:00–19:00, P3
Monte Carlo Study of Mixed-Spin S=(1/2,1) Ising Ferrimagnets — •Walter Selke1 and Jaan Oitmaa2 — 1Institut für Theoretische Physik der Phasenübergänge, RWTH Aachen, Germany — 2School of Physics, University of New South Wales, Sydney, Australia
We investigate classical Ising ferrimagnets on square and simple–cubic lattices with exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites and an additional single–site anisotropy term on the S=1 sites [1]. Based mainly on a careful and comprehensive Monte Carlo study, we conclude that there is no tricritical point in the two–dimensional case, in contradiction to mean-field predictions and recent series results. However, evidence for a tricritical point is found in the three–dimensional case. In addition, a line of compensation points is found for the simple–cubic, but not for the square lattice.
[1] W.Selke and J. Oitmaa, J. Phys. C: Condensed Matter 22, 076004 (2010)