Hall Effect and Resistance of Dilute Gold-Chromium Alloys at Low Temperatures

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Abstract
The temperature dependence of the Hall effect and of the electrical resistance has been investigated in pure gold and in gold containing 0.03 and 0.05 atomic percent chromium, principally at temperatures in the liquid helium region. For these compositions the temperature dependence of the resistance is abnormal at low temperatures, exhibiting a resistance minimum. No corresponding anomaly was observed in the Hall effect, but neither was it constant as one might expect in terms of a simple theory. Instead, a monotonic increase of the Hall constant with decrease in temperature was obtained below room temperature. This behavior is not influenced by the presence of a resistivity minimum to any appreciable extent. The experimental results favor the interpretation of the resistance minimum as a scattering phenomenon. The specimens were in the form of annealed foils, approximately 20×10×0.04 mm. A special circuit permitted measurement of the Hall voltages to 0.01 μv, or about 1 part in 1000.