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Electron localization during an electronic-topological transition in Mo-Re alloys

  • Metals and Superconductors
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Abstract

Oscillations in the superconducting transition temperature ΔT c (P), in the critical magnetic field ΔH c (P), in the thermopower α / T (T 2), and in electrical resistivity ρ(T) (P is pressure) of Mo1−x -Re x alloys are observed at low temperatures against the background of specific features related to an electronic-topological transition (ETT) in these alloys. The oscillations are sensitive to the impurity concentration: they increase when the Re impurity concentration is close to the critical concentration C c at which the ETT occurs. Oscillations are also detected in the concentration dependences of the temperature coefficient of resistivity (∂ρ / ∂T (C)) and the thermopower derivative (∂(α/T) / ∂T 2 (C)) of Mo1−x -Re x alloys at low temperatures. The former and latter oscillations are shown to correlate with each other. These specific features are assumed to result from the ETT and to be related to the localization of the part of the electrons that fill a new cavity in the Fermi surface during this transition.

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Original Russian Text © T.A. Ignat’eva, 2007, published in Fizika Tverdogo Tela, 2007, Vol. 49, No. 3, pp. 389–397.

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Ignat’eva, T.A. Electron localization during an electronic-topological transition in Mo-Re alloys. Phys. Solid State 49, 403–412 (2007). https://doi.org/10.1134/S106378340703002X

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