Abstract
A novel high-Tc superconducting (HTS) buffered step-edge Josephson junction is fabricated. A 250 nmPrBa2Cu3O7 (PBCO) layer was epitaxially grown on a (001) MgO substrate by PLD, which acts as a bufferedtemplate for a step-edge. Argon-ion milling was used to obtain a step-edge with a step angle of25°. The step-edge is analysed in terms of an extended Wu and Chen model (Wu and Chen2006 Rev. Sci. Instrum. 77 1). The model validity is confirmed by the correspondencebetween the theoretically proposed and experimentally observed step angles. A 150 nmYBa2Cu3O7−δ (YBCO)thin film was accordingly grown over the PBCO step-edge and patterned by standard photolithography.I–V characteristics were obtained by DC and AC excitation of the patterned junctions. TheIcRn product values are of the order of 1.6 mV and 0.36 mV at 53 K and 77 K, respectively. Thesevalues are higher than typical values found in the literature. The observation of Shapirosteps confirms the presence of the Josephson effect in this novel junction topology.
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