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  • 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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  • 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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  • 6
    Electronic Resource
    Electronic Resource
    Diamagnetic activity above T c as a precursor to superconductivity in La 2- x Sr x CuO 4 thin films (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 420-423 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Superconductors show zero resistance to electric current, and expel magnetic flux (the Meissner effect) below the transition temperature (Tc). In conventional superconductors, the ‘Cooper pairs’ of electrons that are responsible for superconductivity form only below ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35086540
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  • 7
    Electronic Resource
    Electronic Resource
    Nonequilibrium gap instability and phase transition under intense tunnel injection in superconducting lead films (1978)
    Springer
    Journal of low temperature physics 33 (1978), S. 439-457 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We report on lead energy gap measurements made under intense tunnel current injection near the gap edge at various temperatures in terms of the differential tunnel resistance at zero bias voltage using the double-junction configuration. It is shown that the behavior is significantly different below T λ and above T λ. For T 〈 T λ, a first-order transition occurs and the result is close to the prediction by the Μ * model, although the estimated phonon trapping factor may be large. For T 〉 T λ, an instability similar to that of Chang and Scalapino is observed. The gap reduction behavior, however, is complicated, and cannot be interpreted in terms of present theories. In addition, a new structure which indicates an abrupt enhancement of the gap is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115569
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  • 8
    Electronic Resource
    Electronic Resource
    Model for quantum scattering of rotons. I. Hard-sphere interaction (1971)
    Springer
    Journal of low temperature physics 4 (1971), S. 637-656 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new model is proposed for the behavior of rotons. We postulate a linear Schrödinger equation with a hypothetical Hamiltonian fit to the dispersion relation and treat the three-dimensional scattering problem. All calculations are done in closed form. As an example, we study scattering by a hard sphere, which yields the same result as that obtained in the high-energy limit of the usual Schrödinger equation. The calculated mobility gives a reasonable fit to the radii of both positive and negative ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628298
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  • 9
    Electronic Resource
    Electronic Resource
    Anomalous temperature dependence of the quasiparticle-injection-induced voltage onset in superconducting lead films (1978)
    Springer
    Journal of low temperature physics 31 (1978), S. 605-612 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: The large quasiparticle injection through a tunnel barrier is studied, in particular when the bias tunnel voltage is close to the gap edge. It is shown that the quasiparticle-injection-induced voltage threshold in a superconducting lead film has an anomalous temperature dependence above Tλ. The effect cannot be accounted for by simple heating. Below Tλ, a first-order transition of the lead film is observed. A possible explanation based on a nonequilibrium model is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115106
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  • 10
    Electronic Resource
    Electronic Resource
    Model for quantum scattering of rotons. II. Two-dimensional interaction (1971)
    Springer
    Journal of low temperature physics 5 (1971), S. 353-362 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A speculative roton Hamiltonian is used to calculate scattering cross sections in the two-dimensional problem. For the hard-cylinder interaction, one gets the same result as that obtained by the usual wave scattering in the high-energy limit. The variational calculation for the roton-vortex interactionP ·v s yields the temperature-independent momentum-transfer cross section σT ≈ 8 Å, improving the results obtained before by other methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00629710
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