Abstract
New ultra-high precision (0.1 ppm) measurements of the resistivity of potassium down to 70 mK are discussed. Between 0.35 and 1.2 K. the resistivity has a T2 temperature dependence which is independent of the sample parameters and the room temperature treatment of the samples. This behavior is consistent with the predictions for simple electron–electron scattering, but such a simple model cannot adequately explain previous data. Below 0.35 K the data are anomalous in that the temperature variation is slower than T2.
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