Superconductivity in thin films of RuN

A. S. Ilin; A. O. Strugova; I. A. Cohn; V. V. Pavlovskiy; A. V. Sadakov; O. A. Sobolevskiy; L. A. Morgun; V. P. Matrovitskii; G. V. Rybalchenko; S. V. Zaitsev-Zotov

arXiv · 2310.09526

Superconductivity in thin films of RuN

A. S. Ilin·A. O. Strugova·I. A. Cohn·V. V. Pavlovskiy·A. V. Sadakov·O. A. Sobolevskiy·L. A. Morgun·V. P. Matrovitskii·G. V. Rybalchenko·S. V. Zaitsev-Zotov

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Abstract

Superconductivity has been found in RuN films obtained by reactive magnetron sputtering. This is a novel member of the metal nitride superconductors family. The critical temperature of the superconducting transition varies depending on the substrate and ranges from 0.77 K to 1.29 K. The parameters of the crystal lattice of superconducting films have been determined: the lattice is distorted cubic with parameters $a = b = c = 4.5586$ \AA , $\alpha =\beta =\gamma =87.96^\circ$. A zero temperature upper critical magnetic field $H_{c2}(0)$ and the coherence length were found from the experimental data using WHH model. $H_{c2}(0) = 2.3$ T- 4.1 T for different substrates and exceeds the upper paramagnetic limit, as well as $\xi = 12$ nm. An s-wave single band energy gap $\Delta(0) = 0.19$ meV was revealed by self-field critical current experiment at temperatures down to 10 mK, $2\Delta /kT_c =5.5$ exceeding the BCS ratio 3.5.

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A. S. Ilin, A. O. Strugova, I. A. Cohn, V. V. Pavlovskiy, A. V. Sadakov, O. A. Sobolevskiy, L. A. Morgun, V. P. Matrovitskii, G. V. Rybalchenko, S. V. Zaitsev-Zotov. 2023-10-14. Superconductivity in thin films of RuN. https://arxiv.org/abs/2310.09526

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