Effect of Co2N impurity on the superconducting properties of d-MoN thin films grown by polymer assisted deposition

N. HABERKORN; Y. Y. ZHANG; Z. BI; B. H. PARK; L. CIVALE; Q. X. JIA

MATERIALS CHEMISTRY AND PHYSICS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2021 vol. 259 p. 124184 - 124189

0254-0584

We report the effect of Co2N impurity on the superconducting properties of delta-MoN thin films grown by polymer-assisted deposition on c-cut sapphire (Al2O3). The films show a superconducting transition temperature of 10.4 K and an upper critical field Hc2 (0) perpendicular to the film surface around 3 T. The latter corresponds to a relatively large coherence length , which enhances the two-dimensional limit when the magnetic field is applied parallel to the film surface. In comparison with pure -MoN films, the inclusion of Co2N impurity in the delta-MoN films could significantly modify the critical current density at the vortex-free state. The ability to tune the superconducting properties of metal-nitride superconductors by introducing chemically and structurally compatible impurity may find potential applications for superconducting single-photon detectors.