Self-Shunted NbN Junctions With ${\rm NbN}_{x}/{\rm AlN}$ Bilayered Barriers for 4 K Operation

Autor:	Hiroyuki Akaike, Akira Fujimaki, Yuki Nagai, R. Kanada
Rok vydání:	2009
Předmět:	Josephson effect Materials science Fabrication Condensed matter physics Electrode High voltage Critical current Electrical and Electronic Engineering Condensed Matter Physics Superconducting integrated circuits Electronic Optical and Magnetic Materials Electronic circuit Voltage
Zdroj:	IEEE Transactions on Applied Superconductivity. 19:249-252
ISSN:	1558-2515 1051-8223
DOI:	10.1109/tasc.2009.2017854
Popis:	We report the fabrication and electrical characteristics of self-shunted Josephson junctions consisting of NbN electrodes, an AlN barrier, and an NbNx normal layer for an SFQ circuit application. To fabricate such junctions with a high characteristic voltage V c, we have studied their preparation conditions including the surface treatments of MgO substrates. Junction characteristics at 4 K were dependent on the electrical properties and film thickness of the NbNx layer; the underdamped junctions changed into overdamped ones with an increase in the film thickness. The overdamped junctions showed a characteristic voltage Vc of 0.8 mV and a critical current density Jc of 22 A/cm2 at 4.2 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6c4998fec2577f0324b020a9fa4a7b89 https://doi.org/10.1109/tasc.2009.2017854 Zobrazit plný text záznamu