Phase diagram of the antiferromagnetic XY model in two dimensions in a magnetic field
arXiv:1010.4539 · doi:10.1103/PhysRevB.78.212408
Abstract
The phase diagram of the quasi-two-dimensional easy-plane antiferromagnetic model, with a magnetic field applied in the easy plane, is studied using the self-consistent harmonic approximation. We found a linear dependence of the transition temperature as a function of the field for large values of the field. Our results are in agreement with experimental data for the spin-1 honeycomb compound BaNi_2V_2O_3
3 pages