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  • American Institute of Physics (AIP)  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of the performance of superconducting nonequilibrium devices (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 533-539 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The performance of a superconducting three-terminal nonequilibrium device utilizing quasiparticle-injection phenomena is investigated. The switching time is derived from the transient solution of the rate equations, whereas the gains are calculated from the steady-state solution. For Nb and Pb, the switching times are estimated to be order of 10 ps for sufficiently thin films provided that only the first-half rapid rise part of the transient behavior is used. The gains are weakly dependent on film thickness because of a high phonon trapping factor. For an appropriate magnitude of load resistance, the current and power gains are calculated to be ∼30 and ∼0.5, respectively. These values are considerably increased by taking the double-junction-acceptor geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336664
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Josephson effects in YBa2Cu3Oy grain boundary junctions on (100)MgO bicrystal substrates (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 769-771 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The grain boundary YBa2Cu3Oy(YBCO) Josephson junctions are fabricated on (100)MgO bicrystal substrates with a misorientation angle of 24° and the microwave properties of Josephson effects are studied up to millimeter-wave range. Strong [100]//[010] and [010]//[100] in-plane orientations are observed at the junction interface of a YBCO film, whose microscopic geometries are discussed in connection with the observed Josephson effects. The directly observed maximum Josephson microwave self-radiation powers from the junction at receiver frequencies of fREC=22 GHz and 47 GHz are 3.2×10−12 W and 5.6×10−14 W, respectively. The observed characteristic voltage (Vc) is 4.4 mV, corresponding to the frequency of about 2 THz at 4.2 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114088
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  • 3
    Electronic Resource
    Electronic Resource
    Direct observation of Josephson self-radiation in Bi2Sr2Ca2Cu3Oy break junctions above 77 K (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1729-1731 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have directly observed the Josephson self-radiation emitted from a Bi2Sr2Ca2Cu3Oy break junction at receiver frequencies fREC=11 and 47 GHz above liquid-nitrogen temperature. The results on the current-voltage characteristics, the dV/dI vs I curves, the harmonic Josephson self-radiation, and the dependence of critical current on microwave self-radiation power are well interpreted in terms of the current biased resistively shunted junction model. The maximum first-harmonic self-radiation powers at receiver frequencies fREC=11 and 47 GHz were P(I) =3×10−13 and P(I)=1×10−13 W at 77 K, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111792
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  • 4
    Electronic Resource
    Electronic Resource
    Supercurrent distribution in high-TC superconducting YBa2Cu3O7−y thin films by scanning superconducting quantum interference device microscopy (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3069-3071 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The two-dimensional vector mapping of current distributions in high-TC superconducting YBa2Cu3O7−y thin films obtained by converting magnetic-field data measured by scanning superconducting quantum interference device (SQUID) microscopy is reported. The current distribution contains the contributions from both transport supercurrent and vortex current. The transport supercurrent is found to flow mainly along the edge of a stripline, and the numerical calculation based on the simple London model by taking the specific sample-detector geometry into account is given. The agreement between the experimental data and the calculated results is good, demonstrating that the scanning SQUID microscope provides a useful tool for studying the current distribution in a superconductor. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323991
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  • 5
    Electronic Resource
    Electronic Resource
    Spin-polarized quasiparticle tunnel injection in a YBa2Cu3Oy/Au/Co junction (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1149-1151 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the strong suppression of YBa2Cu3Oy (YBCO) supercurrent by injection of spin-polarized quasiparticles (QP) using a cobalt ferromagnetic injector. The injection of spin-polarized QP generates a substantially larger nonequilibrium population as compared with that of an unpolarized injection current. The observed current gain depends on the thickness of Au interlayer (dAu) and is directly related to the nonequilibrium magnetization due to spin relaxation effects. For dAu=15 nm, the tunnel characteristic a YBCO/Au/Co junction exhibited a zero bias conductance peak, which may be interpreted by spin scattering processes at a ferromagnetic/d-wave superconductor junction. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124625
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