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Structural and electrical properties of biepitaxial Josephson junctions of YBa2Cu3O7−δ

✍ Scribed by K. Petersen; C. Stölzel; M. Schmitt; C. Krimmer; W. Wilkens; J. Söllner; H.W. Grueninger; H. Adrian

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
149 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

Biepitaxial Josephson junctions were prepared on MgO and SrTiOa substrates. The obtained electrical properties as superconducting critical temperature To, critical current density Jc ~ 104A/cm2(30 K), specific junction conductance ~N ~ 50/(pf~cm 2) and the IcRn-product ~ 0.1 mV (30 K) are similar on both substrates. Stability against thermal cycling is only observed for junctions on MgO-substrates. The junctions can be well described by the resistively-shunted-junction (RSJ) model, regarding I-Vcharacteristics and Shapiro step oscillations. Thermal activated phase slippage (TAPS) yields a significant broadening of the superconducting transition. However, SQUID performance at 77 K was obtained on both substrates.

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✍ Floriana Lombardi; Thilo Bauch; Karin Cedergren; Jesper Johansson; Tobias Lindst 📂 Article 📅 2007 🏛 Elsevier Science 🌐 English ⚖ 437 KB

We have observed energy level quantization in an all high critical temperature superconductor d-wave Josephson junction. From the measurements we have also extracted the quality factor Q of the junction which is of the order of 40. These results indicate that the role of dissipation mechanisms in hi