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

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.