Physical Review B
The phase diagram of the mean-field Ising model in a random field obeying a symmetric three-peak distribution is determined. This distribution is relevant to diluted antiferromagnets in a uniform magnetic field. The phase diagram includes a fourth-order point, tricritical points, ordered critical points, critical end points, and a double critical end point. An ordered phase persists for arbitrarily large random fields at low temperatures.
Kaufman, Miron; Klunzinger, Philip E.; and Khurana, A., "Multicritical Points in an Ising Random-Field Model" (1986). Physics Faculty Publications. 100.
Kaufman, Miron, Philip E. Klunzinger, and A. Khurana. "Multicritical Points in an Ising Random-Field Model." Physical Review B 34 (1986): 4766-4770.
Copyright 1986 American Physical Society. Available on publisher's site at http://link.aps.org/doi/10.1103/PhysRevB.34.4766.