Magnetoresistivity studies of Zr-Mamorphous alloys (M=Ni, Co, and Fe): From superconductivity to ferromagnetism

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Abstract
Magnetoresistivity studies of three-dimensional (3D) amorphous transition-metal alloys have demonstrated that although a qualitative understanding is possible, a quantitative agreement between experimental data and quantum theories of the conductivity is often difficult. This lack of a good quantitative comparison arises mainly from the failure to take into account all the different effects involved. In this work we present a comprehensive study of the magnetoresistivity of the Zr-M (M=Ni,Co,Fe) amorphous alloys and demonstrate concretely the importance of exchange enhancement for the nearly magnetic alloys and superconducting fluctuations for the superconducting alloys. By correctly taking into account both of these contributions, we achieve a quantitative description of the experimental results for the complete range of alloys, from superconducting to ferromagnetic.