Phase diagram and tricritical behavior of an Ising metamagnet model in a trimodal random field

The random-field Ising model with asymmetric bimodal probability distribution

“…Two tricritical points were found for the RFIM with nn and nnn interactions with bimodal, see Ref [38],. or trimodal distribution functions, see Ref [39],. but for the bimodal with nn interactions they were not found earlier, although the positive solutions T TCP + do The upper (T TCP − ) and lower (T TCP + ) tricritical temperatures against the probability p. For p = 1/2 the upper temperature equals 2/3, whereas the lower vanishes as in Ref [6]…”

Mean field renormalization group: A theoretical approach to the Fe1−qAlq in the bcc lattice

“…In recent years, the pure and disordered magnetic systems have been a source of active research, highlighting the potential for technological applications and also of relevant importance as a prototype for theoretical and experimental studies. [1][2][3][4][5] In this context, many disordered magnetic systems have been of a particular interest because it is possible to induce novel kinds of critical behavior, e.g., one can mention the FeAl alloy for the study of theoretical models involving phase transitions. The FeAl alloy has drawn the attention of many researchers due to promising high-tech properties such as resistance to oxidation and corrosion, good ductility at room temperature, relatively low density, magnetic permeability as well as vibration damping and insulating properties.…”

The random field Ising model with an asymmetric trimodal probability distribution

“…However, for some p-and q-values two tricritical temperatures (upper and lower ones) occur, see Fig. 1(b) [39,40], since both temperatures are solutions to the simultaneous equations αF 2 = 1, F 4 = 0. Fig.…”