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Point contact tunneling (PCT) and low energy muon spin rotation (LE-muSR) areused to probe, on the same samples, the surface superconducting properties ofmicrometer thick niobium films deposited onto copper substrates using differentsputtereing techniques: diode, dc magnetron (dcMS) and HIPIMS. The combinedresults are compared to radio-frequency tests performances of RF cavities madewith the same processes. Degraded surface superconducting properties are foundto yield lower quality factors and stronger Q slope. In addition, bothtechniques find evidence for surface paramagnetism on all samples andparticularly on Nb films prepared by HIPIMS.

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