The Effect of Anisotropy in Electron Scatterings on the Hall Coefficients for Pd Metal and Its Alloys

抄録

It is shown that an anisotropy in relaxation times of current carriers plays an essential part in the Hall effect for Pd alloys. An expression for the Hall coefficient, containing parameters A which describe anisotropies in the relaxation times, is derived in the two-band model. A relation between A and scattering mechanisms for carriers is derived by a simple approximation. Using these expressions, it is shown that the temperature dependences of the Hall coefficients for dilute alloys can be explained qualitatively. The Hall coefficients of Pd-Ag system at room temperature are calculated as a function of Ag content c, using the anisotropy parameter determined for dilute alloys, and compared with experimental data. Agreements between the calculated and the observed results are quite satisfactory in region c≤0.5.