Die Temperaturabhängigkeit des Halleffektes von Palladium und Silber und ihre Beeinflussung durch Zusatzmetalle im Temperaturbereich von 50° bis 300°K

Hall effect measurements in the temperature range between 50 and 300°K are presented for Pd-alloys with Rh, Ag, Ti, Fe and Ag-alloys with Cd, In, Sn, Sb, Mg, Li and for the pure metals Pd and Ag too. They are compared with former measurements by other authors. Using the two band model for the Pd-alloys and Zimans eight cone model for the Ag-alloys the temperature dependence of the Hall constant is connected with a temperature dependent anisotropy of the relaxation time. For the Pd-alloys we use the free electron approximation for the s-electrons, which are the main current carriers. Since the s-band is coupled with the nearly occupied d-band by scattering processes, the relaxation time for the s-electrons may get anisotropic. This effect is stronger the lower the temperature. An anisotropic relaxation time may occur for the Ag-alloys too caused by large distortions of the Fermi surface towards the Brillouin zone faces.