HALL-EFFECT OF POLYCRYSTALLINE CO-PD ALLOYS

Hall-effect measurements were carried out on a series of Co100-xPdx al loys from 4.2 to 255 K. The extraordinary Hall coefficient R(S) is ana lyzed. The side-jump mechanism is dominant for Co-Pd alloys with x les s than or equal to 65 at. %; however, when x>65 at. %, both the side-j ump and skew scattering mechanisms are equally effective. The Hall con ductivity gamma(H) changes its sign around x(H)=77 at. %. x(H) is shif ted to the right-hand side of the band-gap position x(G), as implied f rom the anisotropic magnetoresistance data and the split-band theory.