المشروع الصيفي
تخصص تحول الطاقة · دفعة 2026
Structure-Property Correlation for Nitride Superconductors for Use in Ultra Low Energy Applications
Niobium nitride (NbN) is a strongly-coupled s-wave superconductor central to many technologies where a high and reproducible transition temperature (𝑇c) is essential. Prior work showed that 𝑇c in pulsed-laser-deposited 𝛿 NbNcan be tuned through nitrogen partial pressure via lattice-strain and carrier-density effects, but did not analyse normal- state resistivity directly as a predictor of 𝑇c. Here we combine published transport data for epitaxial NbN films grown on MgO(001) at 0–70 mTorr with atomic force microscopy performed in this work (32 scans, 3–4 positions per film, analysed in Gwyddion). Resistivity correlates strongly with 𝑇c (r = 0.88), comparable to the lattice parameter (r = +0.96), while surface roughness shows no significant relationship with either. Resistivity varies parabolically with pressure (R² = 0.98) falling with pressure below 25 mTorr and rising above 30 mTorr., independently reproducing the growth mode crossover previously observed in X-ray diffraction. Comparison with seven thicker reactively sputtered NbN films reveals the same qualitative trend (r = 0.96 against ln 𝜌) but an offset ranging between 3–6K at matched resistivity, indicating that resistivity-based 𝑇c calibration is deposition-technique specific.
مع أكاديمية كاوست
- دفعة 2026
إمبريال كوليدج لندن · التدريب الصيفي في تحول الطاقة
هل تريد تحديث بياناتك أو حذفها؟ تواصل معنا.