Bibliographic Details
| Title: |
Tunneling study of cavity grade Nb: possible magnetic scattering at the surface |
| 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 |
