Field-tuned superconductor-insulator transitions and Hall resistance in thin polycrystalline MoN films.

We report on the superconductor-insulator transitions (SITs) of disordered molybdenum nitride (MoN) thin films on (1 0 0) MgO substrates as a function of the film thickness and magnetic fields. The T of the superconducting MoN films, which exhibit a sharp superconducting transition, monotonically decreases as the normal state R increases with a decreasing film thickness. For several films with different thicknesses, we estimate the critical field H and the product zν  ≃  0.

Localization and pair breaking parameter in superconducting molybdenum nitride thin films.

We have investigated the superconductor-insulator transition in molybdenum nitride films prepared by deposition onto MgO substrates. It is indicated that the T depression from [Formula: see text] for thick films with increase of the normal state sheet resistance [Formula: see text] was well explained by the Finkel'stein formula from the localization theory. Present analysis suggests that the superconducting-insulator transition occurs at a critical sheet resistance [Formula: see text].