High-Field Magnetoresistance in Dilute Alloys

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Abstract
Results of high-field magnetoresistance measurements are summarized for dilute alloys1 of Cu(Mn), Cu(Fe), Cu(Cr), and Rh(Fe). The temperatures range from 1.3°–20°K and fields extend to 200 kG. The general features show a negative contribution to the magnetoresistance for Fe, Mn, and Cr in Cu and a positive one for Fe in Rh. This is consistent with the temperature dependence of the resistance for those alloys. The magnetoresistance data for Cu(Fe) and Rh(Fe) demonstrate that the magnetic moment is not fully developed at 200 kG as expected from (our unpublished) high-field magnetic moment data and from microscopic Mössbauer measurements.2 The approach to magnetic saturation in Cu(Mn) is examined in detail by means of the magnetoresistance data. We also construct μ(B, T) for the other alloys. The results are compared with our magnetic moment measurements and with related studies of the spin-compensated state. The detailed results of these experiments will be published elsewhere.

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