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  • 1
    Electronic Resource
    Electronic Resource
    Influence of the idle region on the dynamic properties of window Josephson tunnel junctions (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2073-2080 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The processes developed in the last years for the fabrication of high quality, reliable all-refractory Josephson tunnel junctions open a window in an insulating region, called the idle region, which provides the passivation of the base electrode all around the junction itself. We report experimental data showing that the phase velocity of electromagnetic waves in the junction barrier can be considerably modified by the presence of the insulating region surrounding the window Josephson tunnel junctions. We have investigated this phenomenon in unidimensional junctions, measuring the asymptotic voltage of the Fiske resonances in the presence of an externally applied magnetic field. We have considered the effect of an idle region: (i) along the long junction dimension and (ii) at the extremities of the junction. When comparing the behavior to that of a bare junction, in the first case the phase velocity has been found to increase and to be affected by dispersion, while in the latter case it decreased and was frequency independent. In order to interpret the main features of the phenomena observed experimentally in terms of basic mechanisms, we propose two simple models for the two different geometrical configurations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358848
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  • 2
    Electronic Resource
    Electronic Resource
    Static properties and current steps in one-dimensional parallel arrays of Josephson tunnel junctions in the presence of a magnetic field (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 322-326 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Static and dynamical states in one-dimensional parallel arrays of small, all refractory Josephson tunnel junctions, are experimentally investigated at 4.2 K. The dependence of the maximum Josephson current on the applied magnetic field in parallel arrays shows asymmetric behavior around secondary maxima which are discussed in terms of a nonuniform applied magnetic field. Current steps and linear branches induced by the applied magnetic field are observed together in the current-voltage characteristics for the first time in the strongly underdamped regime. The resonant structures appearing in the current-voltage characteristics of the arrays show features similar to high-order Fiske modes in a long Josephson junction. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360833
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  • 3
    Electronic Resource
    Electronic Resource
    Flux flow steps in a triangular cell of long Josephson junctions (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 90-92 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Flux flow steps are experimentally found in a triangular cell of long Josephson junctions that we successfully fabricated. Their behavior at the relevant values of the magnetic flux linked to the cell (Φ=0 and Φ=Φ0/2) is compared with the one predicted by numerical simulations of the coupled sine-Gordon equations that model the system. Qualitative agreement between numerical and experimental results is found. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122961
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  • 4
    Electronic Resource
    Electronic Resource
    Phase locked fluxon-antifluxon states in stacked Josephson junctions (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1300-1302 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements were made on a two-stack long Josephson junction with very similar parameters and electrical access to the thin middle electrode. Mutually phase-locked fluxon-antifluxon states were observed. The observed propagation velocity is in agreement with the theoretical prediction. The I-V curves recorded using the bias current in one of the junctions as fixed parameter show that these states continue to also exist when the other junction is oppositely biased. This is found in numerical simulations based on the experimental junction parameters as well. We propose a model in which waves in the junctions coexist with fluxons. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117398
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  • 5
    Electronic Resource
    Electronic Resource
    Series array of highly hysteretic Josephson junctions coupled to a microstrip resonator (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1072-1074 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have tested a new device based on a 12 junction array coupled to a resonator. We have explored the feasibility of the phase lock for all the junctions at the same biasing current, which yields voltage quantization across each junction, eliminating the need to individually bias the junctions. The whole rf structure has been realized by stripline technology. The resonator is fed by a 50-Ω line and is decoupled from the dc circuit by elliptical low-pass filters inserted in the bias leads.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336221
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  • 6
    Electronic Resource
    Electronic Resource
    rf-induced steps in intermediate length Josephson-tunnel junctions (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5406-5410 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the behavior of the rf-induced steps in unidimensional Josephson-tunnel junctions having overlap geometry and length L≈λj. We have investigated the response of the junctions to the rf current in a range of frequency covering the geometrical resonance of the junctions. The experimental data are compared with the predictions of a model based on a multimode expansion of the junction phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340359
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  • 7
    Electronic Resource
    Electronic Resource
    Automatic recording of direct current singularity amplitudes in Josephson junctions (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1623-1625 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have designed and tested an electronic circuit to record the amplitude of any current singularity in the current-voltage characteristic of a Josephson tunnel junction. The detection of the peak current occurs only when the junction voltage is within a range that can be centered and narrowed conveniently. We describe the circuit in detail and illustrate its operation in the recording of some typical dc singularities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138112
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  • 8
    Electronic Resource
    Electronic Resource
    Computer-assisted data acquisition on Josephson junctions (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2958-2963 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An automatic digital data-acquisition system for the test and characterization of superconducting Josephson tunnel junctions is presented. The key feature is represented by the high degree of interaction of the measurement system with the device under test. This is accomplished by an iterated sequence of data acquisitions, automatic analysis, and subsequent modifications of the control signals in the device. In this way, the basic calibration and the value of the relevant quantities involved with the Josephson junction are automatically determined. A connection with a host computer makes possible more complex data analysis, while the full control of the experiment by a dedicated computer allows the operator to perform nonroutine procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140635
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  • 9
    Electronic Resource
    Electronic Resource
    Observation of voltage-locked states in strongly coupled stacked Josephson junctions (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 377-379 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and tested two stacks of strongly coupled long Josephson junctions with access to the intermediate electrode so that they can be independently biased. In these samples, we find four families of voltage-locked states in zero external magnetic field. One of these families is identified with the zero field steps already observed and interpreted in the case of weaker coupling; the others appear to be new phenomena. The voltage spacing of one of them suggests the necessity of a refinement of the current model to obtain a full description of the dynamical states in stacked junctions. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120742
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  • 10
    Electronic Resource
    Electronic Resource
    Mutual phase locking on resonant flux-flow steps in stacked long Josephson junctions (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3412-3414 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate that, independently biasing the junctions in a two stack in the resonant flux-flow regime, we can obtain mutual locking in four different states. Two of them possibly consist of out-of-phase Josephson oscillations and two consist of in-phase oscillations. They are found experimentally to be very stable for a quite large range of applied magnetic field. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120351
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