Abstract
We report on well characterized a-axis trilayers made of NdBa 2Cu 3O 7− δ and PrBa 2(Cu,Co) 3O 7− δ films with smooth surface morphology and high crystallinity. The thin films were grown on (100) SrTiO 3 substrates by rf+dc hybrid sputtering. X-ray diffraction and Rutherford backscattering spectrometry analyses provided evidence of well-equilibrated and relaxed crystal. Planar junctions were fabricated from these a-axis oriented NdBa 2Cu 3O 7− δ /PrBa 2(Cu,Co) 3O 7− δ /NdBa 2Cu 3O 7− δ trilayers. The current–voltage characteristics exhibited Josephson current. Well developed Shapiro steps for 7–20 GHz microwave irradiation were observed. The dependence of the maximum amplitude of the Josephson current under applied magnetic field made evident spatial variations of the critical current over the PrBa 2(Cu,Co) 3O 7− δ barrier layer. The current–voltage characteristics were qualitatively consistent with the resistively-shunted-junction model.
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