1. High-quality epitaxial NbN/AlN/NbN tunnel junctions with a wide range of current density.
- Author
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Wang, Z., Terai, H., Qiu, W., Makise, K., Uzawa, Y., Kimoto, K., and Nakamura, Y.
- Subjects
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TUNNEL junctions (Materials science) , *CURRENT density (Electromagnetism) , *QUANTUM tunneling , *CRYSTAL structure , *SCANNING transmission electron microscopy , *PHYSICS research - Abstract
We have developed high-quality epitaxial NbN/AlN/NbN Josephson tunnel junctions with a wide range of current density Jc. The junctions show excellent tunneling properties with a large gap voltage of 5.6 mV and a large IcRN product of 3.5 mV. The quality factor Rsg/RN is about 60 for the junctions with a Jc of 2.2 A/cm2, and above 10 for the junctions with a Jc of 25 kA/cm2. The crystal structures across the junction barrier are investigated using x-ray diffraction and cross-sectional scanning transmission electron microscopy, and demonstrate epitaxial growth of the NbN/AlN/NbN trilayers for the wide range of Jc. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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