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AbstractAbstract
[en] Short communication
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Israel Physical Society, Jerusalem (Israel); Bulletin of the IPS; v. 39; 175 p; Apr 1993; p. 44; Israel physical society 1993 annual meeting; Tel-Aviv (Israel); 4 Apr 1993
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No abstract available
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Journal of Low Temperature Physics; v. 18(1-2); p. 1-2
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[en] We have performed a linear stability analysis of two arrays of resistively shunted Josephson junctions: a ladder array and a so-called modified linear array. We find the periodic solutions to be linearly stable for a wide range of bias currents in the absence of a load. This is contrasted with the well-studied globally coupled linear array, where stability of the periodic solutions is a sensitive function of bias current and load parameters. For the ladder array, we have studied the nature of the mesh currents for the different decay modes. Numerical evidence leads us to conclude that the branches of the ladder parallel to the bias current play an important role in helping to damp out perturbed currents. We also compare the long-time dynamics of these Josephson-junction arrays with that of an RL network, which is a ladder of resistors and inductors, and for which the decay rates and mesh currents are calculated exactly. We find that at long times the dynamics of all three arrays are basically identical. copyright 1998 The American Physical Society
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No abstract available
Original Title
Phase slippage
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Journal Article
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Physical Review Letters; v. 31(14); p. 873-876
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[en] Critical current of inhomogeneous intergranular Josephson transition is calculated in the assumption concerning superconductivity suppression by local strains of boundary dislocations with random distribution
Original Title
Kriticheskij tok neodnorodnogo dzhozefsonovskogo perekhoda na mezhzerennoj granitse so sluchajnym raspredeleniem dislokatsij
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Journal Article
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Pis'ma v Zhurnal Ehksperimental'noj i Teoreticheskoj Fiziki; ISSN 0370-274X;
; CODEN PZETAB; v. 65(1-2); p. 32-37

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Devoret, M.H.; Esteve, D.; Martinis, J.; Urbina, C.; Collin, G.; Monod, P.; Ribault, M.; Revcolevschi, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Service de Physique du Solide et de Resonance Magnetique1987
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Service de Physique du Solide et de Resonance Magnetique1987
AbstractAbstract
[en] The experimental demonstration of the Josephson effect is a direct manifestation of the quantum phase of the superconductive order parameter and of the coupling of this phase to the electromagnetic field. The ac Josephson effect links the time evolution of the phase difference between two superconductors to the voltage between them. When this voltage is kept fixed externally, the phase difference increases linearly with time, giving rise to an oscillating supercurrent between the superconductors if they are coupled by a weak link such as a tunnel barrier. This effect depends only on the bose like character of the particles carrying the supercurrent. It was thus important to test if the Josephson effect could be observed with copper oxide based superconductors. This was achieved by our experiment performed at Saclay and by other experiments conducted independently. We will focus in this paper on our latest results and their discussion
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Source
1987; 6 p; International Symposium on High Temperature Superconducting Materials Preparations, Properties Processing; Chapel Hill, NC (USA); 17-19 Sep 1987
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Seifert, H.
Tuebingen Univ. (Germany, F.R.). Fakultaet fuer Physik1980
Tuebingen Univ. (Germany, F.R.). Fakultaet fuer Physik1980
AbstractAbstract
[en] The possibility of the occurrence of Josephson and flux-flow effects in microbridges, being manufactured from a type I superconductor and having got dimensions that are larger than the coherence length of the superconducting material is investigated. On account of theoretical considerations the Josephson effect as well as the existence of individual flux quanta should not be possible in such geometries, but exceeding of the critical current should be characterized by formation and motion of flux tubes containing a multitude of flux quanta. Based on earlier work, it could be shown at first by using different techniques of sample preparation and manipulation that the effects shown there have to be explained to a large extent by an intermediate layer in the samples caused by the manufacture process. If the bridge has got small dimensions (10-20 μm of width) formation of a Josephson element may be possible also in the range of the bridge. The sample characteristic depending on the high-frequency current applied for demonstration and on temperature, one has to assume that the high-frequency current makes the total region of the bridge normally conductive, a SNS contact thus being formed. The RSJ model as well as the characteristic-forming mechanisms described from it are discussed in detail by means of the results of an electronic Josephson effect-simulating device constructed within the scope of this work. (orig./HP)
[de]
Es wird die Moeglichkeit fuer das Auftreten von Josephson- und Flux-Flow-Effekten an Mikrobruecken untersucht, die aus einem Typ I Supraleiter hergestellt sind und die Dimensionen groesser als die Kohaerenzlaenge des supraleitenden Materials haben. Auf Grund theoretischer Ueberlegungen sollte Josephsoneffekt sowie die Existenz einzelner Flussquanten bei derartigen Geometrien nicht moeglich sein, sondern das Ueberschreiten des kritischen Stroms durch die Bildung und Bewegung von Flusschlaeuchen charakterisiert sein, die eine Vielzahl Flussquanten enthalten. Aufbauend auf fruehere Arbeiten konnte zunaechst durch verschiedenartige Techniken der Probenpraeparation und Manipulation gezeigt werden, dass die dort nachgewiesenen Effekte zum grossen Teil auf eine herstellungsbedingte Zwischenschicht der Proben zurueckgefuehrt werden muessen. Bei kleinen Brueckendimensionen (10-20 μm Breite) kann es zur Ausbildung eines Josephsonelements auch im Brueckenbereich kommen. Auf Grund der Abhaengigkeit der Probenkennlinie von dem zum Nachweis angelegten Hochfrequenzstrom und der Temperatur muss angenommen werden, dass der Hochfrequenzstrom den gesamten Brueckenbereich normalleitend macht und sich ein SNS-Kontakt ausbildet. Das RSJ-Modell, sowie die daraus ableitbaren Mechanismen bei der Bildung der Kennlinie, werden an Hand der Resultate einer elektronischen Josephsoneffekt-Simulationseinrichtung, die im Rahmen dieser Arbeit erstellt wurde, ausfuehrlich diskutiert. (orig./HP)Original Title
Josephsoneffekt an Mikrobruecken mit grossen Dimensionen
Source
9 Jul 1980; 105 p; Diss. (D.Sc.).
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Bretheau, L.
Ecole Polytechnique X Univ. (France); CEA, DSM-IRAMIS (France)2013
Ecole Polytechnique X Univ. (France); CEA, DSM-IRAMIS (France)2013
AbstractAbstract
[en] The Josephson effect describes the coherent coupling between superconductors and the resulting supercurrent. Microscopically, it arises from the existence of discrete quasiparticle states, localized at the weak link, the Andreev bound states. They come in doublets in each conduction channel of the weak link, with energies symmetric about the Fermi energy and opposite supercurrents. Each Andreev doublet gives rise to four states: the ground state |-> and the excited state |+>, with even parity, and the excited odd states |↑> and |↓>. Is it possible to address and control Andreev doublets? This thesis describes two sets of experiments designed to answer this question using the most basic Josephson element, a one-atom contact between two superconducting electrodes. In a first experiment, we have observed and characterized the excited odd states |↑> and |↓>. As expected for a spin-degenerate system, they do not carry supercurrent. In this experiment the excitation was uncontrolled and resulted from trapping of spurious quasiparticles. We have measured the lifetime of the odd states: under some condition, it is found to exceed 100 μs. The second experiment is a photon-absorption spectroscopy of the Andreev doublet. It was performed by using a Josephson junction as an integrated on-chip microwave emitter and detector. The observed Andreev transitions correspond to excitation from the ground state |->to the excited even state |+>, and are well accounted for by our quantum model. This result opens the way to coherent manipulation of this two level system. The direct observation of the excited Andreev state, either by quasiparticle-injection or photon-absorption, strongly supports the mesoscopic theory of the Josephson effect. It shows that in addition to the phase difference, each channel of a Josephson weak link possesses an internal fermionic degree of freedom. It could be used to code information in a novel type of superconducting qubit. (author)
[fr]
L'effet Josephson decrit le couplage coherent entre supraconducteurs et le supercourant qui en resulte. D'un point de vue microscopique, il decoule de l'existence d'etats de quasiparticules discrets, localises au niveau du lien faible, les etats lies d'Andreev. Ils viennent en doublets dans chaque canal de conduction du lien faible, avec des energies et supercourants opposes. Chaque doublet d'Andreev donne lieu a quatre etats: l'etat fondamental |-> et l'etat excite |+>, avec une parite paire, et les etats excites impairs |↑> et |↓>. Est-il possible d'exciter les doublets Andreev? Cette these decrit deux series d'experiences concues pour repondre a cette question en utilisant l'element Josephson le plus elementaire, un contact atomique entre deux electrodes supraconductrices. Dans une premiere experience, nous avons observe et caracterise les etats excites impairs |↑> et |↓>. Comme attendu pour un systeme degenere en spin, ils ne portent pas de supercourant. Dans cette experience, l'excitation n'etait pas controlee mais du au piegeage spontanee de quasi-particules parasites dans l'un des etats d'Andreev. Sous certaines conditions, le temps de vie mesure de ces etats impairs peut depasser 100 μs. La deuxieme experience est une spectroscopie photonique des etats d'Andreev. Elle a ete effectuee en utilisant une junction Josephson en tant qu'emetteur et detecteur microonde. Les transitions d'Andreev observees correspondent a des excitations depuis l'etat fondamental |-> vers l'etat excite paire |+>, et sont bien decrites par notre modele quantique. Ce resultat ouvre la voie a la manipulation coherente de ce systeme a deux niveaux. L'observation directe de l'etat excite d'Andreev, soit par injection de quasiparticules soit par absorption de photons, conforte la theorie mesoscopique de l'effet Josephson. Cela demontre que, en plus de la difference de phase, chaque canal d'un lien faible Josephson possede un degre de liberte fermionique interne similaire a un spin un-demiOriginal Title
Excitations localisees dans les contacts ponctuels supraconducteurs: verification du doublet d'Andreev
Source
1 Feb 2013; 306 p; 132 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS-NKM website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; Physique
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[en] We demonstrate that the well known phase-locking mechanism leading to Shapiro steps in ac-driven Josephson junctions is always accompanied by a higher-order phase-locking mechanism similar to that of the parametrically driven pendulum. This effect, resulting in a π-periodic effective potential for the phase, manifests itself clearly in the parameter regions where the usual Shapiro steps are expected to vanish. copyright 1999 The American Physical Society
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Yamada, Takahiro; Yamamori, Hirotake; Sasaki, Hitoshi; Shoji, Akira; Urano, Chiharu; Nishinaka, Hidefumi; Murayama, Yasushi; Iwasa, Akio; Nakamura, Yasuhiro, E-mail: yamada-takahiro@aist.go.jp2009
AbstractAbstract
[en] A multi-chip 10 V programmable Josephson voltage standard (PJVS) system was demonstrated using a closed-cycle refrigerator. We precisely measured the PJVS by a direct comparison measurement with a conventional Josephson voltage standard. The result agreed within a combined standard uncertainty of 3.9 x 10-10 at 10 V.
Source
S0953-2048(09)20530-6; Available from http://dx.doi.org/10.1088/0953-2048/22/9/095010; Country of input: International Atomic Energy Agency (IAEA)
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