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Valence instability of uranium in U(Al1−x Gex)3

  • Metals. Superconductors
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Abstract

The electronic structure of U and Ge in the solid solutions U(Al1−x Gex)3 is investigated by measuring x-ray line shifts. It is shown that uranium has the mixed valence U3+ [Rn](5f 3)-U4+ [Rn](5f 2) over the entire composition range (0⩽x⩽1) and that the population of the uranium 5f shell increases by ∼0.28 5f electrons/U atom from UAl3 (x=0) to UGe3 (x=1). The electronic structure of Ge is close to the electronic structure of Ge metal over the entire composition range 0<x⩽1. No variation of the population of the Ge 4p shell is detected to within the experimental error (∼0.1 4p electrons/Ge atom) as the composition varies from x=0.2 to 1. It is established that the delocalization of a U 5f electron occurs as a result of its transition to the s or d band of the same uranium atom.

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Authors and Affiliations

  1. B. P. Konstantinov St. Petersburg Institute of Nuclear Physics, Russian Academy of Sciences, 188350, Gatchina, Leningrad Region, Russia

    A. V. Tyunis, V. A. Shaburov, Yu. P. Smirnov & A. E. Sovestnov

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  1. A. V. Tyunis
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  2. V. A. Shaburov
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  3. Yu. P. Smirnov
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  4. A. E. Sovestnov
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Fiz. Tverd. Tela (St. Petersburg) 39, 1505–1508 (September 1997)

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Tyunis, A.V., Shaburov, V.A., Smirnov, Y.P. et al. Valence instability of uranium in U(Al1−x Gex)3 . Phys. Solid State 39, 1337–1340 (1997). https://doi.org/10.1134/1.1130075

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  • DOI: https://doi.org/10.1134/1.1130075

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