Conductance behavior with temperature and magnetic field in the disordered films of titanium nitride

TL;DR

This study investigates how temperature and magnetic field affect conductance in polycrystalline titanium nitride films, revealing disorder-induced suppression of the superconducting gap and zero bias anomaly behavior.

Contribution

It provides new insights into the effects of disorder and heating on the conductance and superconducting properties of titanium nitride thin films.

Findings

Heated film shows smaller superconducting gap.

Both films exhibit Altshuler-Aronov zero bias anomaly.

Normal state behavior resembles quasi-2D disordered metal.

Abstract

We report in this paper the temperature and mangetic field dependence of the conductance in the polycrystalline film of titanium nitride, before and after heating at ambient conditions. The difference between the two films is the room temperature sheet resistance which remains within 15 percent and both the films show superconducting transition at lower temperatures. The zero field and the high field data, respectively, corresponds to the superconducting and the normal states. Both the films display Atshuler-Aronov zero bias anamoly in their normal states, and the superconducting gap openeing up at low fields. However the heated film has a smaller gap owing to more pronounced zero bias suppression of the density of states. The normal states in both the films are similar to the quasi-2d-disordered metal and its behavior is studied with temperature. Our data suggests that the zero bias anamoly suppresses the superconducting gap with increase in the disorder.