Hall-effect measurements were carried out on a series of Co100−xPdx alloys from 4.2 to 255 K. The extraordinary Hall coefficient RS is analyzed. The side-jump mechanism is dominant for Co-Pd alloys with x≤65 at. %; however, when x≳65 at. %, both the side-jump and skew scattering mechanisms are equally effective. The Hall conductivity γH changes its sign around xH=77 at. %. xH is shifted to the right-hand side of the band-gap position xG, as implied from the anisotropic magnetoresistance data and the split-band theory.
A series of Co]op Pt"alloys were made in an induction furnace. To make the the alloys in a disordered state, they were heated up to 950'C, and then quenched in salt water. Experimental quantities measured include saturation moment, specific heat, residual resistivity, and anisotropic magnetoresistance at low temperatures.By comparing those data with those for the Feloo Cr", Fe&oo "Mo, Fe&oo "W", Co, oo "Ni, and Co&oo "Pd"alloys, we are able to have a complete discussion from the framework of the split-band model. For Co-Pt alloys, the electronic-specific-heat coe%cient has no minimum, and the anisotropic magnetoresistance shows no global maximum either.
Magnetostriction of polycrystalline Co100−xPdx alloys was measured by the strain gauge method from 4 to 300 K. The saturation magnetostriction λs=(2/3)[(ΔL/L)s∥−(ΔL/L)s⊥], where (ΔL/L)s∥ and (ΔL/L)s⊥ are the saturated values (when HE≳5 kG) of ΔL/L in fields parallel and perpendicular to sample’s length (L). λs at 4 K is found to change sign from positive to negative value as x is increased from below x0=50 at. % Pd to above. This phenomenon can be understood from the split-band theory for Co-Pd alloy. However, since some experimental facts indicate that unquenched orbital moments may exist in the x≳50 at. % Pd alloys it is necessary to consider λs = λsband+ λsion, where λsband is due to the split-band theory and λsion is from the one-ion mechanism. Under this proposal, it is possible to explain why λs(4 K) is not antisymmetric with respect to x0. Finally, two different origins of temperature dependence of λs are discussed.
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