Depth-Resolved Measurements of the Meissner Screening Profile in Surface-Treated Nb
Ryan M. L. McFadden, Md. Asaduzzaman, Thomas Prokscha, Zaher Salman, Andreas Suter, Tobias Junginger
DOI 10.1103/PhysRevApplied.19.044018 · Physical Review Applied
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Abstract
We report depth-resolved measurements of the Meissner screening profile in several surface-treated Nb samples using low-energy muon spin rotation. In these experiments, implanted positive muons, whose stopping depths below Nb’s surface are adjusted between approximately 10nm and 150nm, reveal the field distribution inside the superconducting element via their spin precession (communicated through their radioactive decay products). We compare how the field screening is modified by different surface treatments commonly used to prepare superconducting radio-frequency cavities used in accelerator beamlines. In contrast to an earlier report [A. Romanenko et al., Appl. Phys. Lett. 104, 072601 (2014)], we find no evidence for any “anomalous” modifications to the Meissner profiles, with all data being well described by a London model. Differences in screening properties between surface treatments can be explained by changes to the carrier mean free paths resulting from dopant profiles near the material’s surface.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.25 | Pressure unresolved | unknown |
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