Superconducting properties in tantalum decorated three-dimensional graphene and carbon structures

TL;DR

This study investigates superconducting properties in tantalum thin films deposited on three-dimensional graphene and carbon structures, revealing superconductivity at around 1K, high critical magnetic fields, and notable cooling effects, with potential applications in flexible electronics.

Contribution

It demonstrates the emergence of superconductivity in tantalum films on 3D graphene and carbon structures, highlighting their high critical magnetic fields and unique cooling effects, which are novel findings in this context.

Findings

Superconducting transition temperatures of 1.2K and 1.0K in the films.

Critical magnetic fields of approximately 2 Tesla with linear temperature dependence.

Observation of an anomalously large cooling effect in the 3DG-tantalum device.

Abstract

We present here the results on superconducting properties in tantalum thin films (100nm thick) deposited on three-dimensional graphene (3DG) and carbon structures. A superconducting transition is observed in both composite thin films with a superconducting transition temperature of 1.2K and 1.0K, respectively. We have further measured the magnetoresistance at various temperatures and differential resistance dV/dI at different magnetic fields in these two composite thin films. In both samples, a much large critical magnetic field (~ 2 Tesla) is observed and this critical magnetic field shows linear temperature dependence. Finally, an anomalously large cooling effect was observed in the differential resistance measurements in our 3DG-tantalum device when the sample turns superconducting. Our results may have important implications in flexible superconducting electronic device applications.