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• W2022896955 endingPage "897" @default.
• W2022896955 startingPage "888" @default.
• W2022896955 abstract "Superconductivity in niobium-oxygen body-centered-cubic solid-solution alloys (oxygen content 0.024-3.50 at.%) was studied by calorimetric, magnetic, and resistive measurement techniques. These measurements included low-temperature-specific-heat capacity, superconducting-normal transition temperature ${T}_{c}$, direct-current magnetization, and electrical resistivity, as well as x-ray lattice parameter, microhardness, and optical metallography to characterize the samples. Oxygen in solid solution lowers the ${T}_{c}$ of niobium. In contrast to the prediction of DeSorbo, we found that $ensuremath{gamma}$, the electronic coefficient of low-temperature-specific-heat capacity, also decreases with oxygen concentration. Our data indicated that the band-structure electronic density of states at the Fermi level ${N}_{mathrm{bs}}(0)$ and the electron-phonon coupling constant $ensuremath{lambda}$ both decrease with oxygen content. Therefore, both the density of electronic states and the phonon spectrum may be controlling the magnitude of ${T}_{c}$ in the niobium-oxygen system. Additional superconducting parameters were calculated for the niobium-oxygen alloys from our calorimetric, magnetic, and resistive data. The Ginzburg-Landau parameter ${ensuremath{kappa}}_{mathrm{GL}}$ was found to increase from less than 1.0 for essentially pure Nb to about 10 for the Nb-3.5-at.%-O alloy. Calculated values of ${H}_{c2}(4.2 mathrm{K})$ versus atomic-percent oxygen exhibit a maximum at 2-at.% oxygen which was observed experimentally." @default.
• W2022896955 created "2016-06-24" @default.
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• W2022896955 date "1974-02-01" @default.
• W2022896955 modified "2023-09-26" @default.
• W2022896955 title "Effects of interstitial oxygen on the superconductivity of niobium" @default.
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• W2022896955 doi "https://doi.org/10.1103/physrevb.9.888" @default.
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