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    Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in Superconductor Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.1088/1361-6668/aa8926

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A low energy muon spin rotation and point contact tunneling study of niobium films prepared for superconducting cavities

Research output: Contribution to journalJournal articlepeer-review

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  • Tobias Junginger
  • S. Calatroni
  • A. Sublet
  • G. Terenziani
  • T. Prokscha
  • Z. Salman
  • A. Suter
  • T. Proslier
  • J. Zasadzinski
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Article number125013
<mark>Journal publication date</mark>7/11/2017
<mark>Journal</mark>Superconductor Science and Technology
Issue number12
Volume30
Number of pages14
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Point contact tunneling and low energy muon spin rotation are used to probe, on the same samples, the surface superconducting properties of micrometer thick niobium films deposited onto copper substrates using different sputtering techniques: diode, dc magnetron and HIPIMS. The combined results are compared to radio-frequency tests performances of RF cavities made with the same processes. Degraded surface superconducting properties are found to correlate to lower quality factors and stronger Q-slope. In addition, both techniques find evidence for surface paramagnetism on all samples and particularly on Nb films prepared by HIPIMS.

Bibliographic note

This is an author-created, un-copyedited version of an article accepted for publication/published in Superconductor Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.1088/1361-6668/aa8926