TY  - JOUR
AU  - Beebe, M. R.
AU  - Beringer, D. B.
AU  - Burton, M. C.
AU  - Yang, K.
AU  - Lukaszew, R. A.
PY  - 2016
DA  - 2016//
TI  - Stoichiometry and thickness dependence of superconducting properties of niobium nitride thin films
T2  - Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
JO  - Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
SP  - 021510 (1 to 4)
VL  - 34
IS  - 2
KW  - potential plagiarism
KW  - possible plagiarism
KW  - NbN films
AB  - The current technology used in linear particle accelerators is based on superconducting radio frequency (SRF) cavities fabricated from bulk niobium (Nb), which have smaller surface resistance and therefore dissipate less energy than traditional nonsuperconducting copper cavities. Using bulk Nb for the cavities has several advantages, which are discussed elsewhere; however, such SRF cavities have a material-dependent accelerating gradient limit. In order to overcome this fundamental limit, a multilayered coating has been proposed using layers of insulating and superconducting material applied to the interior surface of the cavity. The key to this multilayered model is to use superconducting thin films to exploit the potential field enhancement when these films are thinner than their London penetration depth. Such field enhancement has been demonstrated in MgB2 thin films; here, the authors consider films of another type-II superconductor, niobium nitride (NbN). The authors present their work correlating stoichiometry and superconducting properties in NbN thin films and discuss the thickness dependence of their superconducting properties, which is important for their potential use in the proposed multilayer structure. While there are some previous studies on the relationship between stoichiometry and critical temperature TC, the authors are the first to report on the correlation between stoichiometry and the lower critical field HC1.
SN  - 0734-2101
UR  - http://avs.scitation.org/doi/10.1116/1.4940132
UR  - https://doi.org/10.1116/1.4940132
DO  - 10.1116/1.4940132
N1  - Potential plagiarism for 1503
ID  - Beebe_etal2016
ER  -