S. Basu et Sk. Ghatak, EFFECT OF DISORDER ON THE CRITICAL-BEHAVIOR OF A FERROMAGNETIC BINARYISING ALLOY, Journal of magnetism and magnetic materials, 127(1-2), 1993, pp. 52-56
The effect of site and exchange disorders on the critical behaviour of
a disordered ferromagnetic Ising binary alloy is studied by evaluatin
g the magnetization and the susceptibility with the help of a cluster-
variational method. The critical exponents gamma and gamma describing
, respectively, the linear and nonlinear scaling of the susceptibility
exhibit a non-monotonic temperature dependence for T > T(c). Gamma i
ncreases with increasing disorder. The critical exponent beta increase
s with disorder, whereas delta remains unaffected. A rapid shrinking o
f the asymptotic critical region and variation of the limiting (T >> T
(c)) values of gamma = THETA(p)/T(c) with the increase in disorder are
observed.