Double‐barrier tunnel junctions for quasiparticle mixers

Autor:	D. Billon-Pierron, M. Rosengarten, T. Lehnert, H. Rothermel, Alexandre Karpov, K. H. Gundlach
Rok vydání:	1994
Předmět:	Materials science Condensed matter physics Annealing (metallurgy) London penetration depth Niobium General Physics and Astronomy chemistry.chemical_element Magnetic field Tunnel effect chemistry Condensed Matter::Superconductivity Electrode Quasiparticle Irradiation
Zdroj:	Journal of Applied Physics. 75:4097-4102
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.355988
Popis:	Double‐barrier niobium tunnel junctions with the middle electrode thinner than the London penetration depth were fabricated. Their I‐V curves, annealing behavior, response to external magnetic field, and response to 230 and 350 GHz irradiation in mixer experiments is discussed. Junctions with an integrated tuning circuit designed for the 230 GHz frequency range gave double‐sideband receiver noise temperatures of 100 K. Vertically stack arrays can be attractive for various applications. Compared to single‐barrier devices possible drawbacks were noted. The I‐V curve indicates heating and/or nonequilibrium effects. Double‐barrier devices became nonuniform after thermal annealing at 200 °C. The response to the external magnetic field is more complex and considerably larger flux densities are needed to suppress Josephson effects.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b5eaca68d76b6e8338b0194c137dfee0 https://doi.org/10.1063/1.355988 Zobrazit plný text záznamu