Stable superconducting niobium ultrathin films
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ABSTRACTWe report on a combined structural and electronic analysis of niobium ultrathin films (from 2.5 to 10 nm) epitaxially grown in ultra-high vacuum on atomically flat sapphire wafers. We demonstrate a structural transition in the early stages of Nb growth, which coincides with the onset of a superconducting-metallic transition (SMT). The SMT takes place on a very narrow thickness range (1 ML). The thinnest superconducting sample (3 nm/ 9ML) has an offset critical temperature above 4.2K and allows to be processed by standard nanofabrication techniques to generate air and time stable superconducting nanostructures.
1995 ◽
Vol 53
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pp. 610-611
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1971 ◽
Vol 29
◽
pp. 226-227
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1971 ◽
Vol 29
◽
pp. 212-213