Influence of growth parameters on the superconducting transition temperature in granular aluminum films

TL;DR

This paper explores how different growth parameters, such as oxygen flow and evaporation rate, affect the resistivity and superconducting transition temperature of granular aluminum films, aiming to optimize their superconducting properties.

Contribution

It provides a systematic analysis of how specific growth conditions influence superconducting properties in granular aluminum films, offering guidance for optimization.

Findings

Higher oxygen flow increases resistivity and Tc.

Lower substrate temperature enhances superconducting transition temperature.

Optimal growth parameters improve superconducting characteristics.

Abstract

This study investigates the influence of various growth parameters on normal-state resistivity and superconducting transition temperature Tc of granular aluminum films. Specifically, we focus on the effects of oxygen flow and aluminum evaporation rate during the growth process conducted at different substrate temperatures, from 300 K down to 25 K. We report systematic correlations between the growth conditions, the normal-state resistivity, and Tc. Furthermore our findings provide insights into optimizing the superconducting characteristics of granular aluminum.