含30—42at.％Ni合金的电阻极小理论

含30—42at.％Ni合金的电阻极小理论 THEORY OF ELECTRICAL RESISTANCE MINIMA OF ALLOYS CONTAINING 30-42at.%Ni 杨振凡 Yang Zenfan 1 2 3 first-author 刘福绥 1 2 3 武汉大学物理系 武汉大学物理系 Physics Departmant, Wuhan University) Liu Fusui Physics Departmant, Wuhan University) Liu Fusui 北京大学物理系 北京大学物理系 武汉大学物理系北京大学物理系 武汉大学物理系北京大学物理系 对于含30—42at.%Ni的AuNi合金和CuNi合金,观察到以低温电阻极小形式出现的反常特性。为了解释合金中电阻率的这个反常温度关系,本文应用无序自旋集团模型,分别在孤立自旋集团和耦合自旋集团情况下,讨论了sd相互怍用对电阻率的贡献。导出的电阻率表式为ρ , kond 0 =nρ 0 -nρ 1 log T和p , RKKY=A。这两个表示式与Kondo电阻率表示式和耦合磁性杂质电阻率表示式形式相同。与声子贡献结合起来,总电阻率写为ρ=ρL（T）+ρ 0 （0）-nρ 1 logT+A。应用这个结果能够定量地解释实验中观察到的电阻极小。 Anomalous behaviors in the forms of low-temperature electrical resistance minima were observed for Au—Ni and Cu—Ni alloys containing 30—42at.% Ni.To explain the anomalous temperature dependence of the resistivity in alloys, the contributions of sd interaction to the electrical resistivity are considered in the case of single spin-clusters and coupling spin cllsters separately by using the disordered spin-cluster model.The derived equations for resistivity are σ cluster,kondo =nσ 0 -nσ 1 log T and ρ cluster, RKKY=A n 2 /T. Both expressions are the same forms as the expressions of the Kondo resistivity and coupling magnetic impurities resistivity. Together with the phonon contribution, the total resistivity can be written as ρ=ρ L （T）+σ 0 （0）-nρ 1 logT+A n 2 /T.The resistance minima that was observed in the experiments can explain quantitativly by using the results. 1985-02-01 2021-04-01 2