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Regular version of the site

Article

NbN films on vicinal to the X-cut of LiNbO3 surfaces

Materials Letters. 2020. Vol. 260. P. 1-4.
Chichkov V., Shamrai A., IIl’ichev I., Ksenz A., Orlov V., Egorov S., Orlova N., Shvets I., Bozhko S., Ионов А. М.

We report a study of epitaxial superconductive NbN films on vicinal to the X-cut of single crystal LiNbO3 substrates grown using reactive magnetron sputtering of Nb target in Ar -N2 atmosphere. It is found that the NbN films reveal sharp superconductive transition at TC= 15.2 K and anisotropy of critical current. Critical current measured along the Z direction exceeds JC along the Y direction regardless of the orientation of step edges of the vicinal surfaces. The anisotropy effect is attributed to NbN film uniaxial stress due to the lattice mismatch of NbN (0 0 1) layer along the Z direction of LiNbO3.