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• W1984143695 abstract "Thorium disilicide is dimorphic and both forms are superconducting (β-ThSi2 of AlB2-type with Tcr = 2.41 K and α-ThSi2 tetragonal with Tcr = 3.16 K). New materials have been obtained substituting either Rh or Ir for Si in α-ThSi2. With increasing x, Tcr decreases in both solid solutions for 0<x<0.25 but increases sharply for x > 0.75 attaining 6.50 K for x = 1. In the intermediate composition range 0.25<x<0.75 the corresponding compounds have not been found to be superconducting above 1.7 K. Low-temperature heat capacity measurements carried out between 1.7 K and 20 K have shown that α-ThSi2 and ThIrSi are strong-coupled superconductors. The density of states at the Fermi level N(0) is the lowest for the compound having the highest Tcr i.e. for ThIrSi. Such a behavior could be explained by an electron-phonon interaction stronger in ThIrSi than in α-ThSi2. X-ray photoelectron measurements carried out on ThIrxSi2−x silicides show that electrons are transfered from thorium to silicon and iridium atoms. The spectra of the valence bands of α-ThSi2 and α-ThIrxSi2−x show a predominant character of the thorium 6d states at the Fermi level. A band centered at around 3.2 eV below the Fermi level appears in α-ThIrxSi2−x. It has been attributed to the iridium 5d states." @default.
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• W1984143695 date "1986-02-01" @default.
• W1984143695 modified "2023-09-26" @default.
• W1984143695 title "Etude de nouveaux supraconducteurs ThIrxSi2−x (0≦x≦1) par chaleur specifique a basse temperature et spectroscopie XPS" @default.
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• W1984143695 doi "https://doi.org/10.1016/0025-5408(86)90205-9" @default.
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