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. 2022 Nov 22;12(23):4109. doi: 10.3390/nano12234109

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Thickness dependence of the superconducting transition temperature of NbN films deposited on MgO (MO), SiO $_{2}$ (SO) and Al $_{2}$ O $_{3}$ substrates, both c-cut (SC) and r-cut (SR) types. For comparison, $T_{c}$ data of films deposited on Al $_{2}$ O $_{3}$ r-cut substrates by Soldatenkova et al. [37] were plotted.