Low‐Temperature Galvanomagnetic Effects in n‐Type PbS

The resistivity and Hall effect of lead sulphide single crystals containing 1016 to 1017 electrons cm−3 have been measured at temperatures down to 0.2 °K in magnetic fields up to 40 kG. The number of conduction electrons is independent of both magnetic field and temperature. A negative longitudinal magnetoresistance at low fields gives place to a positive effect at high fields and both are strongly dependent on electron concentration.