Abstract
The temperature and concentration dependences of the electrical resistivity for alloys of americium with plutonium are analyzed in terms of the multiband conductivity model for binary disordered substitution-type alloys. For the case of high temperatures (T > ΘD, ΘD is the Debye temperature), a system of self-consistent equations of the coherent potential approximation has been derived for the scattering of conduction electrons by impurities and phonons without any constraints on the interaction intensity. The definitions of the shift and broadening operator for a single-electron level are used to show qualitatively and quantitatively that the pattern of the temperature dependence of the electrical resistivity for alloys is determined by the balance between the coherent and incoherent contributions to the electron-phonon scattering and that the interference conduction electron scattering mechanism can be the main cause of the negative temperature coefficient of resistivity observed in some alloys involving actinides. It is shown that the great values of the observed resistivity may be attributable to interband transitions of charge carriers and renormalization of their effective mass through strong s-d band hybridization. The concentration and temperature dependences of the resistivity for alloys of plutonium and americium calculated in terms of the derived conductivity model are compared with the available experimental data.
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Original Russian Text © Yu.Yu. Tsiovkin, A.A. Povzner, L.Yu. Tsiovkina, V.V. Dremov, L.R. Kabirova, A.A. Dyachenko, V.B. Bystrushkin, M.V. Ryabukhina, A.V. Lukoyanov, A.O. Shorikov, 2010, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 138, No. 6, pp. 1153–1162.
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Tsiovkin, Y.Y., Povzner, A.A., Tsiovkina, L.Y. et al. Temperature and concentration dependences of the electrical resistivity for alloys of plutonium with americium under normal conditions. J. Exp. Theor. Phys. 111, 1019–1027 (2010). https://doi.org/10.1134/S1063776110120150
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DOI: https://doi.org/10.1134/S1063776110120150