Update on the method using nonlocal/noncontact differential conductance experimental data for direct probing Andreev reflections and for extracting the superconducting gap

TL;DR

This paper updates a nonlocal, contactless differential conductance method for directly probing Andreev reflections and extracting the superconducting gap, building on previous work with high-temperature superconductors and conventional superconductors.

Contribution

It introduces an improved nonlocal differential conductance technique for more accurate detection of superconducting gaps from experimental data.

Findings

Successful application to hydrogenated graphitic fibers

Extension of the method to conventional superconductors like Pb

Enhanced accuracy in identifying Andreev reflections

Abstract

In our previous work, high-temperature superconductivity (HTSC) was probed for the first time by using electrical differential conductance Gdiff(V) = dI/dV data as obtained from current-voltage V(I) measurements on a hydrogenated graphitic fiber [1]. While our nonlocal method for finding the superconducting (SC) gap was recently applied to a conventional SC (Pb [2]), the nonlocal Gdiff method was first proposed in [1]. Herein, we are bringing forth an update on the topic.