Physical Review B
The global phase diagram of the Blume-Capel model in a random field obeying the bimodal symmetric distribution is determined by using the mean-field method. The phase diagram includes an isolated ordered critical end point and two lines of tricritical points. A new phase emerges for strong enough random fields: the ferromagnetic-nonmagnetic phase. It is argued that such a phase occurs in three dimensions.
Kaufman, Miron and Kanner, M., "Random-Field Blume-Capel Model: Mean-Field Theory" (1990). Physics Faculty Publications. 16.
Kaufman, Miron and M. Kanner. "Random-Field Blume-Capel Model: Mean-Field Theory." Physical Review B 42 (1990): 2378-2382.
Copyright 1990 American Physical Society. Available on publisher's site at http://link.aps.org/doi/10.1103/PhysRevB.42.2378.