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• W1969955844 abstract "In situ resistive measurements of the ratio of surface to bulk critical fields in thoroughly degassed pure niobium foils are found to agree well with theory over the temperature range 0.69 less than or equal to t less than or equal to 0.99. This result is unchanged after reheating the samples above 2000 K, in oxygen atmospheres of up to 0.96 x 10$sup -7$ Torr. We have also observed a considerable increase in H/subc/$sub 3$ and H/subc/$sub 2$ in samples reheated at above 0.96 x 10$sup -7$ Torr, with the Ginzburg-Landau parameter kappa rising to 3.04 after reheating at 5.0 x 10$sup -7$ Torr. Nonetheless, the ratio of critical fields remains 1.7 to t=0.97. The increased critical fields can be attributed to increased surface roughness and faceting which occurs on heating in oxygen, resulting in a considerably diminished mean free path. An enhancement of H/subc/$sub 3$ above the value 1.7H/subc/$sub 2$ was observed above t=0.97 in these samples. The cause of this behavior has yet to be understood, although we suggest the presence of carbides at the surface as an explanation. (AIP)" @default.
• W1969955844 created "2016-06-24" @default.
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• W1969955844 date "1975-11-01" @default.
• W1969955844 modified "2023-09-26" @default.
• W1969955844 title "Superconducting critical fields in niobium and niobium containing oxygen" @default.
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• W1969955844 doi "https://doi.org/10.1103/physrevb.12.3690" @default.
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