AN ADAPTATION OF THE AUGMENTED SPACE APPROACH TO RANDOM MAGNETIC ALLOYS: AN APPLICATION TO Ni1−xFex

An application of CPA and cluster CPA to Ni rich Ni 1−x Fe x ferromagnetic alloy on the basis of multiband tight binding model is discussed. The augmented space method of Mookerjee1 has been extended to include the case where the potential is generated self-consistently. The tight binding Anderson Hamiltonian incorporates a term to account for the opposite Coulomb repulsion of electrons. The resulting Anderson-Hubbard Hamiltonian is used to consider the spin fluctuations and moment formation, on alloying, of the transition metal Ni with Fe.