Abstract
An earlier calculation (see ibid., vol.6, p.221 (1976)) based on the generalized Landau theory of phase transitions is extended to ferromagnetic disordered alloys for which the cubic term in the Landau equation is essential. To be tractable the cubic term is linearized and the linearization is tested for an ordered system where numerical solutions of the full cubic equation are available. The Green's function analogy is applied to the linearized equation to derive a general self-consistent system of equations for the susceptibility and magnetization of weakly ferromagnetic disordered alloys. This general system is solved in CPA for PdNi alloys in an applied field and the concentration and field dependences of the susceptibility and magnetization are calculated.
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