Abstract
We report the fabrication of graphene/YBa2Cu3O7−δ contacts and their superconducting proximity effect. Both the temperature dependence of resistance and the current bias dependence of resistance for the contacts are investigated, respectively. The results are compared with that of pure YBCO Hall bar. It is found that the differential resistance transits from a non-zero value to zero at high bias across graphene/YBCO junction below the transition temperature of YBCO, the phenomena indicate the tunneling of Cooper pairs from YBCO to graphene. As the YBCO film deposited by pulsed laser deposition has a rough surface, the graphene layer can contact with the edge of CuO2 planes. It allows that Cooper pairs could leak into graphene along the CuO2 planes.
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