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.
@article{arxiv.1408.5679,
title = {Superconducting properties in tantalum decorated three-dimensional graphene and carbon structures},
author = {Cayetano S. F. Cobaleda and Xiaoyin Xiao and D. Bruce Burckel and Ronen Polsky and Duanni Huang and Enrique Diez and W. Pan},
journal= {arXiv preprint arXiv:1408.5679},
year = {2014}
}