HALL EFFECT AND ELECTRICAL CONDUCTIVITY OF GOLD-ZINC AND GOLD-PALLADIUM-ZINC ALLOYS.

The specific electrical resistivity rho and the Hall coefficient R//H of beta prime -phase alloys Au//1//0//0// minus //xZn//x, 47 less than equivalent to x less than equivalent to 52, and Au//5//0// minus //xPd//xZn//5//0, 0 less than equivalent to x less than equivalent to 15. 02 were studied in the temperature range 1. 8 less than equivalent to T/K less than equivalent to 298. Alloys of the binary system and of the ternary system at small x undergo martensitic transformations. The influence of sample treatment on R//H and rho was investigated. The dependences of R//H and rho from temperature and valence electron concentration are discussed within the framework of a two-band model. The martensitic transformation is characterized by changes of the electron relaxation times and the concentration of the carriers. Besides the strong change of R//H during martensitic transformation, marked magnetoresistance is observed. At small concentrations of Pd, the magnetoresistivity is negative.