Abstract
A model of a binary ferromagnetic alloy A 1− c B c is discussed in terms of a single band Hubbard type hamiltonian. It is shown by summing up contribution of single-site scattering to all orders, that the inverse life time of long-wavelength magnons due to disorder scattering is proportional to q 5 and, in the limit c ⪡ 1, to the concentration c .
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