AF in triangular lattice

Phase diagram of the classical Heisenberg antiferromagnet on a triangular lattice in an applied magnetic field.
Luis Seabra, Tsutomu Momoi, Philippe Sindzingre, and Nic Shannon
Phys. Rev. B 84, 214418 (2011)

Magnetic phase diagram of the AFM Heisenberg model on a triangular lattice, obtained from MC simulation. Continuous phase transitions are drawn with a dashed line, while Berezinskii-Kosterlitz-Thouless phase transitions are drawn
with a dotted line.