High Upper Critical Field and Type II Superconductivity in Epitaxial Cubic W₂N Thin Films

Transition Metal Nitrides (TMNs) are a versatile class of materials, combining chemical robustness, high hardness, and superconducting behaviour with critical temperatures between 2-10 K. While several binary TMNs have been explored, superconductivity in stoichiometric W₂N has remained largely unexplored. Here, we report on superconducting thin films of stoichiometric W₂N, demonstrating a distinctly high upper critical field (H_c2) of ∼ 8.5 T, uncommon among binary TMNs. This robust superconducting response under high magnetic fields highlights the technological relevance of W₂N for integrated quantum and cryogenic electronic platforms. Overall, these results position stoichiometric W₂N as a promising addition to the TMN superconducting landscape, opening new avenues for functional materials design based on chemically stable and mechanically resilient nitrides.