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The electrical resistivity of Ni-Cu alloys has been measured in the temperature range from 4.2 to 1100 K. By using the numbers of conduction electrons and hole-carriers estimated in this study, the anomalous magnetic resistivity in ferromagnetic Ni-Cu alloys, which has a maximum around 25 at %Cu notwithstanding the linear decrease of magnetization or Curie temperature with increasing Cu content, is explained as a result of the coexistence of scattering processes of spin disorder and s-d transitions. The anomalous variation of the residual resistivity. with concentration in Ni-Cu alloys is due mainly to the magnetic clusters, which have the maximum influence at the critical concentration for ferromagnetism.

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