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

2); (2) TRIUMF Canada's National Laboratory for Particle; (3) European Organisation for Nuclear Research (Cern); (4) Paul Scherrer Institut (PSI); (5) Argonne National Laboratory; A. Sublet (3); Chicago; Commissariat de l'energie atomique et aux energies renouvelables; France (6) Illinois Institute of Technology; Geneva Switzerland

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

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arxiv 1703.08635 v3 pith:US7LLKHF submitted 2017-03-25 cond-mat.supr-con

T. Junginger (1 , 2) , S. Calatroni (3) , A. Sublet (3) , G. Terenziani (3) , T. Prokscha (4) , Z. Salman (4) , T. Proslier (5)

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J. Zasadzinski (6) ((1) Helmholtz-Zentrum Berlin fuer Materialien und Energie (HZB) Germany (2) TRIUMF Canada's National Laboratory for Particle Nuclear Physics Vancouver (3) European Organisation for Nuclear Research (Cern) Geneva Switzerland (4) Paul Scherrer Institut (PSI) Villigen Switzerland (5) Argonne National Laboratory USA Commissariat de l'energie atomique et aux energies renouvelables France (6) Illinois Institute of Technology Chicago USA)

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classification cond-mat.supr-con

keywords filmssuperconductingsurfacecavitiescontactenergyhipimsmuon

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Point contact tunneling (PCT) and low energy muon spin rotation (LE-muSR) are used to probe, on the same samples, the surface superconducting properties of micrometer thick niobium films deposited onto copper substrates using different sputtereing techniques: diode, dc magnetron (dcMS) 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 yield 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.

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