XXVIII International Symposium ''Nanophysics and Nanoelectronics'', Nizhny Novgorod, March 11-15, 2024
Superconductivity

Effect of low doses of ion irradiation on the superconducting properties of thin NbN films

G. Yu. Golubev^a, K. E. Prikhod'ko^ab, B. A. Gurovich^a, D. A. Komarov^a, E. M. Malieva^a, B. V. Goncharov^a, D. A. Goncharova^a, V. L. Stolyarov<sup>a

a</sup> National Research Centre "Kurchatov Institute", Moscow, Russia
^b National Engineering Physics Institute "MEPhI", Moscow, Russia

Abstract: For the first time, experiments have been carried out on the effect of low fluences ($\sim$ 2.7 $\cdot$ 10$^{14}$ cm$^{-2}$) of mixed ion irradiation on the superconducting characteristics of an NbN film. The critical transition currents (obtained from static current-voltage characteristics) and the $R(T)$ dependences were measured for the initial film and after irradiation with a low fluence. It was found that at such a fluence, an increase in the critical current for the transition of NbN from the superconducting state to the normal state is observed. It was established that such a small fluence does not influence the critical transition temperature.

Keywords: NbN thin films, mixed ion irradiation, critical currents of superconducting films, effect of irradiation on the superconducting properties of films.

Received: 18.04.2024
Revised: 18.04.2024
Accepted: 08.05.2024

DOI: 10.61011/FTT.2024.06.58237.23HH

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