Variation of Hall Coefficient of Some Non-ferromagnetic Superlattice Alloys

概要

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The temperature dependence of Hall coefficient of five superlattice alloys of Cu_3Pd, CuZn, Ni_3Cr, Au_3Cu and Ag_3Mg was measured to find the effect of order-disorder transformation upon it. At the transition temperature, the Hall coefficient of Cu_3Pd and Ag_3Mg showed a discontinuous change, while the change of Hall coefficient of other three alloys (CuZn, Ni_3Cr, Au_3Cu) are very small. Applying Muto's theory, the qualitative discussion was made, and it was found that the general features of the temperature dependence of CuZn and Ni_3Cr are well understood by the theory. For Au_3Cu, the result of the experiment is explained by adopting the assumption of Schubert that each Au atom affords more than one electrons into the conduction band. The assumption also explains why the temperature dependence of Hall coefficient of Au_3Cu differs from that of Cu_3Au. It remains unknown why Hall coefficient of Cu_3Pd takes strong minimum at transition temperature, while the abrupt increase of the Hall coefficient with the decreasing temperature below Tc can be explained by the existence of a superzone in the ordered state. In addition, the result Ag_3Mg is contrary with that which Nicholas's theory suggested.
社団法人日本物理学会の論文
1958-09-05