Critical Current Characteristics of Step-Edge YBa2Cu3Oy Weak Links
YBa2Cu3Oy (YBCO) junctions were fabricated across the step-edge on MgO (001) substrates. The line of the step-edge made an angle, a, of 90°, 45°, or 22.5°° with the crystal a-axis. The step heights were 120–350 nm. YBCO films were grown onto the MgO (001) (the step-edge substrate) using an off axis rf magnetron sputtering system. The YBCO films were patterned to a 10 jam narrow strip crossing the edges. The critical current densities of YBCO junctions at T/Tc = 0.9 varied from 103 — 105 A/cm2 depending on ratio of the step height to the film thickness. The I-V curves under microwave irradiation showed Shapiro steps, indicating weak-link behavior. Using the step-edge junctions, we fabricated and characterized junctions and SQUIDs.
KeywordsMicrowave Irradiation Critical Current Density Josephson Junction Step Height Step Edge
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- 1.A.H. Miklich, D. Koelle, F. Ludwig, D.T. Nemeth, E. Dantsker, and John Clarke, Appl. Phys. Lett. 66:9(1995).Google Scholar
- 12.G.I. Cui, K. Herrmann, Y. Zang, C.L Jia, Ch. Buchal, J. Schubert, W. Zander, A.I. Braginski, and Ch. Heiden, in Nonlinear Superconductive Electronics and Josephson Devices, N.F. Pedersen, M. Russo, A. Davidson, G. Costabile, and S. Pagano. ed.. Plennum, New York, 1991.Google Scholar