The entire magnetic phase diagram of the quasi two dimensional (2D) magnet on a distorted triangular lattice KFe(MoO4)2 is outlined by means of magnetization, specific heat, and neutron diffraction measurements. It is found that the spin network breaks down into two almost independent magnetic subsystems. One subsystem is a collinear antiferromagnet that shows a simple spin-flop behavior in applied fields. The other is a helimagnet that instead goes through a series of exotic commensurate-incommensurate phase transformations. In the various phases one observes either true 3D order or quasi-2D order. The experimental findings are compared to theoretical predictions found in literature
@article{arxiv.0807.2804,
title = {Co-existing chiral and collinear phases in a distorted triangular antiferromagnet},
author = {A. I. Smirnov and L. E. Svistov and L. A. Prozorova and A. Zheludev and M. D. Lumsden and E. Ressouche and O. A. Petrenko and K. Nishikawa and S. Kimura and M. Hagiwara and K. Kindo and A. Ya. Shapiro and L. N. Demianets},
journal= {arXiv preprint arXiv:0807.2804},
year = {2012}
}