Tunneling study of cavity grade Nb: possible magnetic scattering at the surface
| Title: | Tunneling study of cavity grade Nb: possible magnetic scattering at the surface |
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| Authors: | Proslier, T., Zasadzinski, J. F., Cooley, L., Antoine, C., Moore, J., Pellin, M., Norem, J., Gray, K. E. |
| Publication Year: | 2008 |
| Collection: | Condensed Matter |
| Subject Terms: | Condensed Matter - Superconductivity, Condensed Matter - Materials Science |
| More Details: | Tunneling spectroscopy was performed on Nb pieces prepared by the same processes used to etch and clean superconducting radio frequency (SRF) cavities. Air exposed, electropolished Nb exhibited a surface superconducting gap delta=1.55 meV, characteristic of clean, bulk Nb. However the tunneling density of states (DOS) was broadened significantly. The Nb pieces treated with the same mild baking used to improve the Q-slope in SRF cavities, reveal a sharper DOS. Good fits to the DOS were obtained using Shiba theory, suggesting that magnetic scattering of quasiparticles is the origin of the gapless surface superconductivity and a heretofore unrecognized contributor to the Q-slope problem of Nb SRF cavities. Comment: 3 pages, 3 figures |
| Document Type: | Working Paper |
| DOI: | 10.1063/1.2913764 |
| Access URL: | http://arxiv.org/abs/0803.2852 |
| Accession Number: | edsarx.0803.2852 |
| Database: | arXiv |
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