Characteristics of NdBa_2Cu_3O_<7-δ>/PrBa_2Cu_3O_<7-δ>/NdBa_2Cu_3O_<7-δ> Planar Josephson Junctions

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We report on the well-characterized properties of a-axis oriented trilayer Josephson junctions made of NdBa_2Cu_3O_<7-δ> and Characteristics of NdBa_2Cu_3O_<7-δ>/PrBa_2Cu_3O_<7-δ> films, and c-axis oriented trilayer Josephson junctions made of NdBa_2Cu_3O_<7-δ> and PrBa_2Cu_3O_<7-δ> films with smooth surface morphology and good crystallinity. a-Axis oriented NdBa_2Cu_3O_<7-δ>4PrBa2(Cu,Co_3O O_<7-δ>/NdBa_2Cu_3O_<7-δ> trilayers and c-axis oriented NdBa_2Cu_3O_<7-δ>/PrBa_2Cu_3O_<7-δ> trilayers were prepared on (100) SrTiO_3 substrates to obtain planar junctions. Their current-voltage characteristics are of the resistively-shunted-junction type at 4.2 K. They showed well-developed Shapiro steps corresponding to 5-20 GHz microwave irradiation. Moreover, the power dependences of the maximum amplitudes of the Shapiro steps were clearly obtained and consistent with the theoretical values expressed as J_n(2eV/hf). The magnetic field dependence of the Josephson current for a-axis oriented trilayer Josephson junctions showed a Fraunbofer-like pattern, suggesting the spatial uniformity of the critical current flowing over the PrBa_2Cu_3O_<7-δ> barrier layer.
社団法人応用物理学会の論文
2002-09-15