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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of asymmetric superconducting quantum interference devices (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5145-5150 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct current-superconducting quantum interference devices (SQUIDs) characterized by asymmetric Josephson junctions have never been used for applications. In order to demonstrate their potential advantages, a throughout numerical analysis of different asymmetric configurations has been carried out. A damping resistance has been included in the SQUID circuit and the thermal noise associated with junction and damping resistances has been considered in the numerical model. Magnetic modulations and flux noise spectral densities have been computed as a function of many parameters (bias current, asymmetry, SQUID inductance, and damping resistance) and the performance of symmetric and asymmetric devices have been compared. The results show that, by properly optimizing the SQUID design, asymmetric SQUIDs are characterized by higher magnetic flux to voltage transfer coefficient and lower flux noise. As a result, asymmetric configurations can be very useful in all the applications where high sensitivity is required. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1360219
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of the loop capacitance on resonant modes in superconducting two-junction interferometers (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 1987-1991 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Self-resonant current steps in superconducting interferometers are investigated. The case of interferometers with non-negligible loop capacitance is considered. A theoretical analysis based on an equivalent electrical circuit is performed to get the resonance frequencies in the current-controlled case. Careful measurements on a slightly asymmetrical (C1≠C2) interferometer are reported. The magnetic field dependence of the maximum amplitude of the resonant steps and their voltage position have been studied. A good agreement between theory and experiments is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345578
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  • 3
    Electronic Resource
    Electronic Resource
    Low 1/f flux noise in sputtered YBa2Cu3O7−x bicrystal dc-superconducting quantum interference devices (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3922-3927 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: YBa2Cu3O7−x bicrystal dc-superconducting quantum interference devices (SQUIDs) and single layer magnetometers working at 77 K have been fabricated and analyzed. Samples have been made in situ by cylindrical magnetron dc sputtering on [001] SrTiO3 bicrystal substrates. Magnetic flux noise levels and magnetic field sensitivities by standard flux-locked-loop electronics have been measured out on dc-SQUIDs and magnetometers, respectively. Flux noise levels as low as a few μΦ0Hz−1/2 in the white noise regime have been measured in SQUIDs, whereas the magnetic field sensitivity of the magnetometers was influenced by external sources. A comparison of experimental data with analytical expressions modelling the behavior of high Tc SQUIDs has been carried out, with special reference to the flux-to-voltage transfer parameter and noise characteristics. Finally, a reduction of 1/f noise of the SQUIDs has been achieved by a wide band bias reversal electronics. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365698
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  • 4
    Electronic Resource
    Electronic Resource
    Low-noise magnetometers with asymmetric superconducting quantum interference devices (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3989-3991 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fully integrated low-critical-temperature magnetometers based on asymmetric superconducting quantum interference devices have been designed, fabricated, and characterized. The large value of the flux to voltage transfer coefficient, typical of such configurations, allow a direct coupling to an external preamplifier without the need of an impedance matching flux transformer or additional positive feedback circuitry. This simplifies the read-out electronics, as required in multichannel systems for low-noise measurements. The values of the magnetic flux noise and field sensitivity, obtained so far, are 3–5 μΦ0/Hz1/2 and 6–7 fT/Hz1/2, respectively. These results are already suitable for biomagnetic applications and can be further improved by properly optimizing the device parameters. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1421226
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  • 5
    Electronic Resource
    Electronic Resource
    Improved superconducting quantum interference devices by resistance asymmetry (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2943-2945 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct current superconducting quantum interference devices made by Josephson junctions with asymmetric shunt resistances have been numerically investigated in the low temperature regime. When combined with a damping resistance, the asymmetry leads to a flux to voltage transfer coefficient several times larger than the one typical of symmetric devices, together with a lower magnetic flux noise. These results show that this type of asymmetric device may replace the standard ones in a large number of magnetometric applications, improving the sensitivity performance. The large transfer coefficient may also simplify the readout electronics allowing a direct coupling of asymmetric devices to an external preamplifier, without the need of an impedance matching flux transformer. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1413733
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  • 6
    Electronic Resource
    Electronic Resource
    Weak link behavior of grain boundaries in Nd-, Bi-, and Tl-based cuprate superconductors (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 417-419 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied single-grain-boundary junctions in the neodymium-, bismuth-, and thallium-based cuprate superconductors and find that they behave as weak links, qualitatively similar to the YBa2Cu3O7−δ superconductor. In general, the grain boundary critical current is determined by flux flow for small misorientation angles and by Josephson junctionlike coupling for large angles. The latter is verified by the observation of voltage oscillations with an external magnetic field in superconducting quantum interference devices built using single-grain-boundary junctions of these materials. The commonality of behavior of grain boundaries in all of the high temperature cuprate superconductors suggests that the weak link is most likely associated with the structure of the grain boundary and the evidence points increasingly to dislocations, which describe the topology of the boundary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108920
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  • 7
    Electronic Resource
    Electronic Resource
    Residual critical current in high Tc bicrystal grain boundary junctions (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 777-779 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have recently reported on the persistence of a significant zero voltage current across bicrystal grain boundary junctions of YBa2Cu3O7−δ in an external magnetic field of several Tesla. In this note we present data on the dependence of this residual current on temperature and orientation of the grain boundary. A description of the grain boundary as being comprised of superconducting microbridges separated by normal regions is consistent with the experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108576
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  • 8
    Electronic Resource
    Electronic Resource
    Transport properties in Tl-Ba-Ca-Cu-O grain boundary junctions on SrTiO3 bicrystal substrates (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 362-364 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the electrical properties of Tl-Ba-Ca-Cu-O high-Tc superconductor bicrystal grain boundary junctions. The behavior of the transport parameters is very similar to those obtained in YBaCuO7−δ junctions. In particular, the temperature dependence of the critical current and the scaling behavior of the critical current density as a function of the misorientation angle were analyzed. Relatively good control of the transport parameters as a function of the misorientation angle has been achieved. The current-voltage characteristics showed a resistively shunted junction model-like behavior at large angles (θ≥20°); at lower angles, the characteristics were more flux-flow like. Preliminary results on noise characteristics are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112376
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  • 9
    Electronic Resource
    Electronic Resource
    Critical current of a high Tc Josephson grain boundary junction in high magnetic field (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1355-1357 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The critical current (Ic) of YBa2Cu3O7−δ grain boundary Josephson junctions was measured up to magnetic fields of 5 T. Magnetic field history dependent Ic values were observed even after correction for self-field effects stemming from hysteretic shielding currents in the grain adjacent to the boundary. A novel feature observed is an anomalous increase in Ic in high magnetic fields of several Telsa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107590
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  • 10
    Electronic Resource
    Electronic Resource
    a-axis tilt grain boundaries for YBa2Cu3O7−x superconducting quantum interference devices (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3542-3544 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting quantum interference devices (SQUIDs) have been fabricated using YBa2Cu3O7−x [100] 45°-tilt grain-boundary Josephson junctions based on a controllable biepitaxial technique. These devices are characterized by large characteristic voltages, desirable magnetic-flux-to-voltage transfer parameters and low flux noise. An energy resolution of 1.6×10−30 J/Hz at liquid helium has been measured, which is the lowest value reported for biepitaxial SQUIDs. These junctions exhibit a phenomenology different from traditional [001] 45°-tilt biepitaxials probably due to the absence of π junctions. The performance of the presented SQUIDs demonstrates that significant improvements in the biepitaxial technique are possible, and the resulting devices have potential for applications. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125382
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