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. 2018 Jun 16;8(6):442. doi: 10.3390/nano8060442

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© 2018 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 (http://creativecommons.org/licenses/by/4.0/).

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Measurements of sample NbN25/A1. (a) $R (T)$ , found by fitting to $I (V)$ taken with $| I | \leq 10$ nA. (b) $I (V)$ at 330 mK. (c) Low-bias sweep at 330 mK, showing a critical voltage feature.