Resistivity of Iron from 0.3° to 4.2°K

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Abstract
Measurement of the temperature dependence of resistance and magnetoresistance in single crystals of iron have been made in the temperature range 0.3° to 4.2°K. Samples with residual resistivity ratios of 1000–4000 were used. In the temperature range 1° to 4.2°K measurements have been made in applied magnetic fields up to 50 kOe. The data have been fitted by computer to expressions for the resistance and in all cases both T and T2 terms are present. In the range 1° to 4.2°K a strong linear term is present as was previously reported.1 Below 1°K the T2 term appears to become more dominant and at temperatures less than 0.8°K the data appear to fit an exponential down to the lowest points measured. The coefficients are strongly affected by applied magnetic fields up to 1200 Oe. However, for 50 kOe fields the changes are much smaller than might be expected. The data will be discussed in terms of electron‐magnon scattering, electron‐electron scattering, and other possible contributions to the temperature dependence of resistance in the helium range of temperature.