Measurement of Specific Capacitance for Nb/Al–AlO $_{x}$/Nb Josephson Junctions in Single-Flux Quantum Circuit Applications
| Autor: | Wei Peng, Yu Wu, Liliang Ying, Zhen Wang, Guanqun Li, Jie Ren, Wanning Xu, Wei Xiong |
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| Rok vydání: | 2018 |
| Předmět: |
Josephson effect
Materials science Condensed matter physics Measure (physics) Resonance Condensed Matter Physics Capacitance Electronic Optical and Magnetic Materials law.invention SQUID Quantum circuit law Condensed Matter::Superconductivity Magnetic flux quantum Critical current Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 28:1-5 |
| ISSN: | 2378-7074 1051-8223 |
| DOI: | 10.1109/tasc.2018.2812737 |
| Popis: | In this study, we investigate different technologies to measure the specific capacitances C 8 of Nb/Al-AlO x /Nb Josephson junctions. They involve measuring Fiske mode resonance in long Josephson junctions, superconducting quantum interference device (SQUID) resonance, and Josephson plasma resonance. We find a logarithmic relationship between the junction C 8 and its critical current density J c in the range 0.1-2 kA/cm 2 using the Fiske mode resonance method. Our measured C 8 values using SQUID resonance and Josephson plasma resonance are compared with the results obtained by other groups via analyzing the major errors in the C 8 calculation. We discuss the accuracy in evaluating C 8 for all three techniques and suggest using Fiske mode resonance as a relatively stable method for C 8 extraction for the future design of our single-flux quantum circuit. |
| Databáze: | OpenAIRE |
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