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- W3045245359 abstract "Abstract The study of the high critical temperature ( T c ) of hydrogen compounds under high pressure has resulted in a considerable focus on Bardeen–Cooper–Schrieffer superconductors. Nb has the highest T c among the elemental metals at ambient pressure, so reviewing Nb films again is worthwhile. In this study, we investigated the factors that determine the T c of Nb films by strain introduction and carrier doping. We deposited Nb films of various thicknesses onto Si substrates and evaluated the T c variation with thickness. In-plane compressive strain in the (110) plane due to residual stress reduced the T c . First-principles calculations showed that adjusting the density of states at the Fermi level is key for both strain-induced suppression and doping-induced enhancement of the Nb T c . The application of hydrostatic pressure compensated for the intrinsic strain of the film and increased its T c , which could also be enhanced by increasing the hole concentration with an electric double-layer transistor. A liquid electrolyte should be used as a pressure medium for applying hydrostatic pressure to increase the T c of correlated materials, where this increase results from changes in material structure and carrier concentration." @default.
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- W3045245359 date "2020-07-01" @default.
- W3045245359 modified "2023-09-25" @default.
- W3045245359 title "Enhancing the critical temperature of strained Niobium films" @default.
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- W3045245359 doi "https://doi.org/10.1088/2053-1591/aba84a" @default.
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