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Effect of hydrogen uptake and substrate orientation on the flux penetration in NbHx thin films

✍ Scribed by M.S. Welling; C.M. Aegerter; R.J. Westerwaal; S. Enache; R.J. Wijngaarden; R. Griessen

Publisher: Elsevier Science
Year: 2004
Tongue: English
Weight: 383 KB
Volume: 406
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2004.03.236

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✦ Synopsis

By absorbing various amounts of hydrogen in the same niobium sample we are able to change the local superconducting properties thus introducing quenched disorder in a controlled manner. Its effect on the magnetic flux penetration in NbH x thin films on A-plane (1 1 2 0) and R-plane (1 1 0 2) sapphire substrates is systematically investigated using a magneto-optical technique. With increasing hydrogen content, flux penetration patterns are observed to become more irregular. At high hydrogen concentrations non-superconducting inclusions are formed. The substrate orientation also has a strong influence on the observed behavior, revealing line-shaped avalanches at 4.2 K for A-plane substrates and a more continuous but spatially irregular behavior for R-plane substrates.

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