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• W2074764669 abstract "Nous avons effectué des mesures de résistivité sous pression sur le l'Yb pur (99,95%) et sur des alliages Yb-Ba dont la concentration atomique en Baryum varie jusqu'à 14,5% de Baryum. La phase c.f.c. est stable en solution solide jusqu'à 20% de Ba dans Yb. On constate que l'adjonction de Ba au sein du réseau c.f.c. de Yb sous forme d'alliage augmente le caractère métallique de celui-ci. Dans l'Yb pur la résistivité croît en T2 de 4,2°K à 30°K et le taux de croissance augmente avec la pression tant que l'Yb reste semi-métal (0–11 kbar). La diminution de la résistivité à température croissante observée dans les alliages est attribuée à une mobilité indépendante de la température fixée par la diffusion sur les sites divalents du Ba et à l'excitation thermique des porteurs dans le petit ‘overlap’. Le nombre de porteurs libres par atome des alliages est déduit de la loi de Nordheim, les résultats sont extrapolés au cas d'une phase hypothétique c.f.c. du Ba. Le caractère métallique de Yb est sans doute dû à la forte hybridation des bandes s-p et d près du niveau de Fermi. Cette hypothèse parait en accord avec le calcul de bande R.A.P.W. de Johansen et Mackintosh. Resistivity measurements have been performed under pressure in 99,95% pure Yb and Yb alloys with Ba concentration ranging from 1 to 14.5 at%. It has been found that the f.c.c. phase is stable in the solid solution up to ∼ 20 at%. From resistivity measurements we have found that alloying with Ba increases the metallic character of Yb. The strong quadratic temperature dependence of the resistivity in pure Yb from 4.2 to 35°K increases with pressure as long as Yb remains a semi-metal (0–11 kbar). The negative temperature coefficient observed in the alloys is attributed to a temperature independent mobility governed by the scattering against divalent Ba atoms and to the excitation of the carriers in the small overlap semi-metal. The density vs. pressure for the residual free carriers is obtained from Matthiessen's rule and is in agreement with direct estimation given by the transport properties measurements under pressure. The density of carriers for the alloys has been deduced from Nordheim's rule and allows us to give predictions about the hypothetical f.c.c. phase of Ba. We suggest that the metallic character of Yb is connected with the strong hybridization between the s-p and d bands near the Fermi level. This fact is in good qualitative agreement with the R.A.P.W. band calculation of Johansen and Mackintosh." @default.
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• W2074764669 date "1971-01-01" @default.
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• W2074764669 title "Etude De l'Ytterbium Et Des Alliages Ytterbium-Baryum Sous Haute Pression A Basse Temperature" @default.
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• W2074764669 doi "https://doi.org/10.1016/s0022-3697(71)80028-8" @default.
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