Equilibrium states in multijunction superconducting quantum interferometers

Autor:	Pavlo Mikheenko, S. J. Lewandowski, Roberto Monaco, A. Konopka
Rok vydání:	1996
Předmět:	Superconductivity Physics Josephson effect Interferometry Condensed matter physics Condensed Matter::Superconductivity General Physics and Astronomy Superconducting tunnel junction Superconducting quantum computing Noise (electronics) Quantum Magnetic flux
Zdroj:	Journal of Applied Physics. 79:7871-7876
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.362397
Popis:	Multijunction superconducting quantum interferometers can be created spontaneously by intrinsic junctions in granular high‐Tc materials, and as a by‐product of step‐edge technology used to fabricate high‐Tc thin film dc superconducting quantum interference devices. The properties of such systems are relatively little known. The theory predicts multivalued dependence of critical current Ic on applied magnetic flux Φe and the appearance of different stationary ‘‘phase states’’ related to different possible relationships between the phases of superconducting order parameter in individual junctions. We report on the measurements performed on a (2×2) quantum interferometer, comprising a series array of two underdamped all‐niobium tunnel junctions in each parallel arm. Experimental results closely follow the theoretical predictions and reveal several instability regions, in which noise generation takes place. These findings can possibly be related to the random telegraph noise observed in high‐Tc materials.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::efc16fe1703e39c5adfefcb3f264d538 https://doi.org/10.1063/1.362397 Zobrazit plný text záznamu