On the problem of galvanomagnetic properties of α-uranium at low temperatures

Magnetic resistance and Hall effect of polycrystal α -U were investigated in the temperature range 4.2-77 K in transverse fields B up to 4 T. It is found that below 43 K the Hall coefficient RH of a- uranium depends on magnetic field. It has been confirmed that below 43 K RH is in strong temperature dependence conditioned by three transitions of 'charge density wave' type. Above 43 K the Hall coefficient is slightly dependent on temperature and is independent of magnetic field. Magnetic resistance was about parabolic and did not show any signs of saturation even in the strong fields. Application of the isotropic two-zone model allowed us to estimate the dependence of charge carriers n and their mobility μ on magnetic field (up to 4 T) and temperature in the range 4.2-77 K. It is shown that the transitions of 'charge density wave' type at T < 43 K are accompanied by a substantial change of n and μ. It is found that at T = 4.2 K n and μ are strongly dependent on magnetic field for fields between 0 and 4 T. At T ≥ 50 K such a dependence is not observed.