We have investigated the electrical conduction properties of very thin NbN films whose sheet resistance is near the critical resistance . The superconducting energy gaps of the films were measured using NbN/MgO/NbN double-tunnel junctions with a very thin NbN intermediate electrode. The results show that the energy gap disappears when the superconductor - insulator transition occurs, retaining the BCS relationship between the energy gap and the critical temperature. The insulating transition in highly resistive films is thought to be due to the charging effect in intergrain tunnel junctions.
No takes yet. Share an insight, caveat, or question.
Su et al. (1996) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: