Comment on "Strong Meissner screening change in superconducting radio frequency cavities due to mild baking" [Appl. Phys. Lett. 104, 072601 (2014)].

This document is a comment on a previous study that examined the Meissner screening properties of niobium (Nb) in a superconducting radio frequency (SRF) cavity. The authors of the comment re-analyzed the data from the original study and found no significant changes to the Meissner screening profile of Nb after mild baking. They also discovered a non-superconducting "dead layer" at the surface of the Nb sample, which may indicate spatial inhomogeneities in the screening properties. The authors recommend further high-resolution measurements to investigate this further. [Extracted from the article]