Hall Effect and Resistivity of Ni-Pd Alloys

Abstract

The two Hall coefficients and the resistivity of Ni-Pd alloys have been measured from 4\ifmmode^\circ\else\textdegree\fi{}K to room temperature using fields up to 3.1 webers/${\mathrm{m}}^{2}$. The ordinary Hall coefficient is found to decrease in magnitude for small additions of Pd in Ni, but to increase as more Pd is added. It is also found that the ordinary Hall coefficient varies more slowly with composition for these alloys than it does for the Ni-Cu alloys. It is shown that a simple treatment successfully correlates the ordinary Hall coefficient, the resistivity, and the saturation magnetization of these alloys. The results indicate that the parallel half of the $d$ band in pure Ni is not quite full at the absolute zero of temperature, and that the relaxation time is not a function only of the energy for the thermal scattering in these alloys. The extraordinary Hall coefficient is found to obey none of the variously proposed theoretical relations.