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Physica C Superconductivity

Ka-band performance of step-edge Josephson junctions using Tl2Ba2CaCu2Ox films on MgO substrates

Shuichi Yoshikawa, Masaaki Nemoto, Kazuhiro Shimaoka, Kazuya Niki, Isao Yoshida, Yorinobu Yoshisato

Published Dec 1, 1996• 3 citations
Publisher
DOI
10.1016/s0921-4534(96)00615-6

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We have prepared high-Tc superconducting heterostructures for DC SQUIDs with graphoepitaxial step edge Josephson junctions on single crystal MgO substrates and investigated them using complementary characterization techniques, including atomic force microscopy, scanning electron microscopy and high-resolution transmission electron microscopy. Combined epitaxial (out-of-plane) and graphoepitaxial (in-plane) growth of YBa2Cu3O7-x (YBCO) films on the tilted surfaces of step edges on MgO substrates was observed. The high-Tc step-edge Josephson junctions demonstrated a good reproducibility and an IcRn product of about 600 μV at 77 K. The DC SQUIDs with step edge junctions showed voltage swings δVpp of up to about 60 μV at 77 K. High values of Rn of the graphoepitaxial step edge Josephson junctions can be advantageous for their applications as qubits.