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

Junginger, Tobias and Calatroni, S. and Sublet, A. and Terenziani, G. and Prokscha, T. and Salman, Z. and Suter, A. and Proslier, T. and Zasadzinski, J. (2017) A low energy muon spin rotation and point contact tunneling study of niobium films prepared for superconducting cavities. Superconductor Science and Technology, 30 (12). ISSN 0953-2048

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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.

Item Type:
Journal Article
Journal or Publication Title:
Superconductor Science and Technology
Additional Information:
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
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500/2505
Subjects:
ID Code:
124280
Deposited By:
Deposited On:
11 Apr 2018 15:26
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 04:11