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

作者：Cobaleda Cayetano S F^*; Xiao Xiaoyin; Burckel D Bruce; Polsky Ronen; Huang Duanni; Diez Enrique; Pan W

来源：Applied Physics Letters, 2014, 105(5): 053508.

DOI：10.1063/1.4892574

We present here the results on superconducting properties in tantalum thin films (100 nm 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 1.0 K, 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 (similar to 2 T) 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.

• 出版日期2014-8-4