Random anisotropy 3D AF: phase diagram

Phase Diagram of a Three-Dimensional Antiferromagnet with Random Magnetic Anisotropy.
Felio A. Perez, Pavel Borisov, Trent A. Johnson, Tudor D. Stanescu, Robbyn Trappen, Mikel B. Holcomb, and David Lederman, M. R. Fitzsimmons, Adam A. Aczel and Tao Hong
Phys. Rev. Lett.114, 097201 (2015)

TRM for FexNi1−xF2 samples measured in H=0 after field cooling in HFC=100  Oe. Data for x=0 and 0.10 were measured with HFC perpendicular to the c axis; all others measured with HFC parallel to the c axis. Right: Magnetic and crystalline structures of the parent compounds NiF2 (x=0) and FeF2 (x=1). Yellow, blue, and red dots are F−, Ni2+, and Fe2+ ions, respectively.