Temperature and concentration dependences of the electrical resistivity for alloys of plutonium with americium under normal conditions |
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Authors: | 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 and A O Shorikov |
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Institution: | 1.Eltsin Ural Federal University,Yekaterinburg,Russia;2.Russian Federal Nuclear Center-Zababakhin All-Russian Research Institute of Technical Physics,Snezhinsk, Chelyabinsk oblast,Russia;3.Institute of Metal Physics,Russian Academy of Sciences, Ural Division,Yekaterinburg,Russia |
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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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