Anisotropic XY antiferromagnets in a field

Abstract

Abstract. Classical anisotropic XY antiferromagnets in a field on square and simple cubic lattices are studied using mainly Monte Carlo simulations. While in two dimensions the ordered antiferromagnetic and spin-flop phases are observed to be separated by a narrow disordered phase, a line of direct transitions of first order between the two phases and a bicritical point are found in three dimensions. Results are compared to previous findings. PACS

Frustration-free spatially anisotropic S=1 square-lattice antiferromagnet Ni[SC(NH2)2Zhao1, Zhao2, Chen3 et al. 2019Phys. Rev. B4110View full textAdd to dashboardCite

“…8. As predicted in the anisotropic XY square lattices [42,45,46], a bicritical point, where the Néel state, the spin-flop state, and the paramagnetic states meet, is observed when the field is applied within the XY plane. On the other hand, a transition to WFM state is unexpectedly occurred for B b.…”

Recent advances in phase transitions and critical phenomena

“…The kinetics of phase ordering for the Ising model are studied by Das et al [17], who report on their finding of different domain growth, ageing and persistence for quenches to temperatures above or below the roughening transition of the three-dimensional Ising model. Turning to systems with continuous degrees of freedom, Selke et al [18] present results on an anisotropic XY model in a field, revealing surprisingly rich phase diagrams in two and three dimensions with lines of first-and second-order transitions and a bicritical point. A classical example of tricriticality is provided by the Blume-Capel or spin-1 Ising model that is reviewed for two dimensions in the contribution by Zierenberg et al [19].…”