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Theses
Etude de nanojonctions Josephson à haute température critique en vue d'applications térahertz
Etude de nanojonctions Josephson à haute température critique en vue d'applications térahertz
Abstract : We developed a novel way to design high temperature Josephson junctions using oxygen ion implantation of a high temperature superconductor. These junctions were electrically characterized and theoretically studied using a quasi classical model based on the Usadel equation. Following the development of a measurement set-up in the 4 to 8 GHz frequency range, the microwave mixing properties of these junctions were studied. Results showed a high amplitude non linear term not explained by the common RSJ model (resistively shunted junction). A phenomenological model was developed, based on a non linearity arising from a varying normal resistance, and was successfully compared to experiments. The previous model paves the way for future improvements in the design of these junctions as microwave mixers and detectors.
Cited literature [158 references]
https://pastel.archives-ouvertes.fr/pastel-00575929
Contributor : Ecole Espci Paristech <>
Submitted on : Friday, March 11, 2011 - 2:23:57 PM
Last modification on : Wednesday, December 9, 2020 - 3:12:37 PM
Long-term archiving on: : Thursday, November 8, 2012 - 11:35:40 AM
Contributor : Ecole Espci Paristech <>
Submitted on : Friday, March 11, 2011 - 2:23:57 PM
Last modification on : Wednesday, December 9, 2020 - 3:12:37 PM
Long-term archiving on: : Thursday, November 8, 2012 - 11:35:40 AM