Abstract
The electrical resistivity of Pt–Ni alloys containing approximately 30, 35, 37, 40, 45, and 50 at.% Ni has been measured between 1.4° and 4.2°K. A clear resistance minimum is found for the two ferromagnetic samples, 45 and 50 at.% Ni, at 3.6° and 2.7°K, respectively. Although no minimum was found for the paramagnetic alloys, there was evidence of a turnup at low temperatures. All of the data could be fitted by the equation ρ = ρ0+AT2−B In T. Both coefficients, A and B, increase rapidly as the critical concentration for ferromagnetism is approached from both the paramagnetic and ferromagnetic sides. The application of a 20-kG field to the 50 at.% Ni sample produced no detectable change in the temperature dependence of the resistivity. Ordering of this sample (by annealing at 600°C) yielded a paramagnetic state for which the coefficient A increased by a factor of three and the In T term was no longer observed. Although the T2 term originates from electron-electron scattering, the origin of the In T term is not clear at the present.
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