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  • 1
    Electronic Resource
    Electronic Resource
    A compact, bipolar, constant–current-voltage source for superconducting junction characterization (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3822-3824 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A versatile, compact, constant current-voltage, bipolar power source for quasi-static or derivative measurements of the characteristics of superconducting junctions has been developed. The circuitry is based on a negative feedback strategy that is effective in maintaining constant current-voltage behavior at the junction itself and all lead resistances are included in the feedback loop. Constant currents and voltages can be delivered of up to ±0.5 A and ±0.75 V, respectively. Both fast and slow sweeps, as well as a single sweep mode, are available in variable ranges. The single sweep feature is used to avoid heating effects in low resistance junctions which are not in good thermal contact with a thermal reservoir (e.g., liquid 4 He).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140449
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Computer-controlled four-gun multisubstrate sputtering system for the preparation of composition-modulated structures (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 607-612 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a four-gun sputtering system which has been used successfully to prepare composition-modulated structures consisting of amorphous semiconductors and superconducting alloys or binary compounds. The substrates are mounted in ovens which can be individually heated to over 1000 °C. The ovens are mounted on a wheel which is driven by a computer-controlled stepping motor. With appropriate programming of the movement of the stepping motor, the deposition sequence is determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138297
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  • 3
    Electronic Resource
    Electronic Resource
    Superconducting properties of layered Nb0.53Ti0.47/Ge structures prepared by dc sputtering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 2543-2549 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sandwich and superlattice structures composed of the high critical field superconducting alloy Nb0.53Ti0.47 (where the compositions refer to weight percent) and amorphous Ge were sputter-deposited on sapphire substrates using a novel multi-sputter-gun system. The thicknesses of both the superconducting Nb0.53Ti0.47 and the insulating Ge layers were varied over a wide range in order to study the two-dimensional (2D) and three-dimensional (3D) superconducting properties of these structures. The observed suppression of the measured resistive superconducting transition temperature Tc with increasing sheet resistance is tentatively interpreted using the Maekawa–Fukuyama theory which incorporates contributions from localization and Coulomb interaction effects. The upper critical fields, with the field both normal Hc2⊥ and parallel Hc2(parallel) to the film, were measured up to 50 kG. Hc2(parallel) exhibited 2D behavior when the thickness of the superconducting layer was less than 200 A(ring). The zero temperature values of Hc2(parallel)(0) were estimated using the Rickayzen formula, which is valid in the regime l(very-much-less-than)(lξ0)1/2(very-much-less-than)Ds (where l, ξ0, and Ds are the mean free path, pure material coherence length, and film thickness, respectively). The estimated Hc2(parallel)(0) peaks at about 400 kG for a superconducting layer thickness of 144 A(ring). This rather high upper critical field, which is considerably above the bulk value of 145 kG, likely has its origin in flux line accommodation within the insulating Ge layers. Since the Rickayzen expression neglects paramagnetic limiting, the true Hc2(parallel)(0) is expected to be somewhat lower; localization/interaction and spin orbit coupling effects are also neglected in this treatment. The situation is none the less encouraging and suggests multilayer superconductors may have a place in high-field magnet technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335443
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Y-Ba-Cu-O thin films on MgO by dc magnetron sputtering from a stoichiometric Y1Ba2Cu3O7−δ target (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1194-1196 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Y-Ba-Cu-O thin films have been deposited on MgO substrates by dc magnetron sputtering from a stoichiometric YBa2Cu3O7−δ target, after which they are subjected to a short heat treatment. Zero resistance is routinely achieved near 60 K, and one film shows zero resistance at 68.0 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98730
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  • 5
    Electronic Resource
    Electronic Resource
    Anisotropic upper critical fields of disordered Nb0.53Ti0.47-Ge multilayers (1987)
    Springer
    Journal of low temperature physics 69 (1987), S. 39-50 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies are reported of the upper critical fields of Nb0.53Ti0.47-Ge multilayers consisting of thick Ge layers and varying-thickness Nb0.53Ti0.47 layers. Both the angular dependence and the temperature dependence of the upper critical fields indicate a dimensional crossover at a Nb0.53Ti0.47 layer thickness near 200 Å. All the 2D samples display a cusplike upper critical field angular dependence with a sharper cusp for thinner Nb0.53Ti0.47 layers. The parallel upper critical fields are tentatively fitted with an expression combining the 2D field dependence of Rickayzen, the paramagnetic limiting behavior of Maki, and the disorder-related Coulomb interaction effects of Maekawa and Fukuyama. The perpendicular fields are fitted with the Maekawa, Ebisawa, and Fukuyama theory; better agreement is obtained for thinner Nb0.53Ti0.47 sublayers when the paramagnetic limiting effect is included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681622
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Search for muon neutrino and antineutrino oscillations in the mass range 15〈Δm 2〈1,000 eV2/c4 (1985)
    Springer
    The European physical journal 27 (1985), S. 53-56 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A search for inclusive muon-neutrino (v µ) and muon-antineutrino $$(\bar v_\mu )$$ oscillations has been performed in the Fermilab narrow band neutrino beam using two detectors running simultanously at two distances from the neutrino source. The data show no evidence for either neutrino or antineutrino oscillations and rule out oscillations ofv µ or $$\bar v_\mu $$ into any other single type of neutrino for 15〈Δm 2〈1,000 eV2/c4 and sin2(2θ)〉0.02–0.40.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01642480
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  • 7
    Electronic Resource
    Electronic Resource
    Superconducting properties of V/Fe superlattices (1986)
    Springer
    Journal of low temperature physics 63 (1986), S. 307-315 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements are reported on the superconducting properties of V/Fe superlatitices showing the interplay between ferromagnetism and superconductivity. When the V layer thickness is on the order of the BCS coherence length and the Fe layer is only a few atomic planes thick, a 2D–3D crossover is observed in the temperature dependence of the parallel upper critical field Hc2‖. This implies the coexistence of superconductivity and ferromagnetism in the Fe layers. Three-dimensional behavior for thinner Fe layers is observed (∼1 atomic plane) and 2D behavior for thicker Fe layers (〉10 atomic planes).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683770
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A sequential product of geminals and its applications (1988)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 34 (1988), S. 15-23 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this paper, an SPG function, which is associated with an extreme point of the set of N-representable second-order reduced density matrices, is used to perform the calculation of the ground state energy of LiH with the variation of internuclear separation. The result of our calculation essentially is in accordance with that of AGP function.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560340104
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  • 9
    Electronic Resource
    Electronic Resource
    The sequential product of geminals and the ground states of some atoms (1988)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 34 (1988), S. 9-14 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By means of the SPG function which is associated with an extreme point of the set of N-representable second-order reduced density matrices, an attempt is made to perform the calculations of the ground states of some atoms with four electrons such as Be. The results show that the SPG function is as suitable as the well-known AGP function for approximating the ground states of atoms and molecules.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560340103
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