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  • Articles  (11)
  • superconductivity  (11)
  • 1985-1989  (11)
  • Electrical Engineering, Measurement and Control Technology  (11)
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  • Articles  (11)
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  • Electrical Engineering, Measurement and Control Technology  (11)
  • Physics  (11)
  • 1
    Electronic Resource
    Electronic Resource
    Optical differentiation of orthorhombic superconductors such as YBa2Cu3O7 from their tetragonal precursor material (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 35-44 
    Details
    ISSN: 1572-9605
    Keywords: ErBa2Cu3O7 ; superconductivity ; optical microscopy ; phase differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The orthorhombic superconducting phase of YBa2Cu3O7 is shown to be differentiable from its tetragonal precursor by optical microscopy. Individual grains 1 μm in diameter or larger are found to either exhibit the color of the compensator in reflected polarized light (tetragonal material) or to change colors from the compensator (orthorhombic material). By using color differences, retained tetragonal material and the orthorhombic nature of untwinned areas of grains are identified. The advantage to producing better superconducting single crystals and sintered polycrystalline materials is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617949
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  • 2
    Electronic Resource
    Electronic Resource
    Band structure and electron-phonon interaction of LaAgO3 (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 175-180 
    Details
    ISSN: 1572-9605
    Keywords: band structure ; electron-phonon interaction ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A comparison is made between the band structure of LaAgO3 and LaCuO3, which is the cubic counterpart of the high-T c superconducting oxides. The electron-phonon parameterη is also calculated and is found to be larger for Ag and O in LaAgO3 than for Cu and O in LaCuO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617661
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  • 3
    Electronic Resource
    Electronic Resource
    Novel technique for crystal growth of superconducting ErBa2Cu3O7 (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 181-190 
    Details
    ISSN: 1572-9605
    Keywords: ErBa2Cu3O7 ; crystal growth ; microscopy ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Millimeter-sized crystals of ErBa2Cu3O7 were fortuitously grown while sintering a flat disk. It was possible to separate individual crystals from the sintered mass and measure their properties. The resistive transition and onset of magnetic transition of a single crystal was 93 K and the resistive transition width was 〈 1 K. Flux expulsion was observed and individual crystals could be levitated by a magnetic field. Crystals showed unusual growth features. They were heavily corrugated along the part of the crystal that grew parallel to the top surface of the disk and that coincided with thec axis of the unit cell. Crystals were characterized by X-rays, electron microscopy, and optical microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617662
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  • 4
    Electronic Resource
    Electronic Resource
    Growth and characterization of evaporated thin films of Y1Ba2Cu3Ox (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 303-311 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3Ox ; evaporation ; films ; superconductivity ; elastic backscattering spectroscopy (EBS)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We have prepared thin films of Y-Ba-Cu-O by coevaporation in the presence of oxygen onto room-temperature substrates, followed by postannealing in oxygen. Films have been grown on (100) SrTiO3, (100) MgO, and LiNbO3. The films have been characterized by electrical resistivity, X-ray diffraction, and elastic backscattering (EBS) measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617719
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  • 5
    Electronic Resource
    Electronic Resource
    The interminable adolescence of superconductivity (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 339-348 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; magnetic separation ; magnetic levitation ; supercritical helium ; magneplane ; maglev ; technology crisis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Seventy-seven years after its discovery, superconductivity has failed to mature into a practical technology because we in America have lacked the curiosity to understand it, the imagination to appreciate it, and the spirit of enterprise to develop it. We are about to miss our last chance to regain technical leadership and economic security if we continue to pretend that higher-T c materials alone will change the situation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618592
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  • 6
    Electronic Resource
    Electronic Resource
    Studies of magnetic flux penetration in a chemically synthesized Bi(Pb)SrCaCuO superconductor (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 273-279 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; flux penetration ; bismuth-lead ; hysteresis loops ; a.c. susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Magnetic measurements were conducted on a sample of chemically synthesized Bi1.5Pb0.5Sr1.5Ca1.75Cu2O x using an a.c. susceptometer and a vibrating sample magnetometer. The sample showed a large fraction of the phase with a superconducting onset temperature of 110K. This high-temperature superconducting phase appears to have extremely narrow hysteresis loops above liquid-nitrogen temperatures, showing a small number of eflective flux pinning sites. Below 40 K, a dimpling can be observed in the hysteresis loop under certain conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617878
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  • 7
    Electronic Resource
    Electronic Resource
    Thermoelectric effects in superconductors (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 323-328 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; theory ; thermoelectric effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The possibility of observing thermoelectric effects in high-temperature superconductors (HTS) is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617883
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  • 8
    Electronic Resource
    Electronic Resource
    Color indicator of cuprate superconductivity observed by polarized light microscopy (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 351-359 
    Details
    ISSN: 1572-9605
    Keywords: Cuprates ; superconductivity ; optical microscopy ; phase differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A common mineralogical technique for identifying individual crystals in a heterogeneous, polycrystalline sample involves the observation at room temperature of their colors in reflected polarized light (colors of polarization). Here we present the observation that a brownish yellow (golden) color of polarization is not only characteristic of the YBa2Cu3O7 superconductor, but of the cuprate superconductors in general and is correlated with the occurrence of superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618522
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  • 9
    Electronic Resource
    Electronic Resource
    Zero resistance at 117 K in Bi1.6Pb0.4Sr2Ca2Cu2+xOy compounds (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 329-335 
    Details
    ISSN: 1572-9605
    Keywords: superconductivity ; Bi1.6Pb0.4Sr2Ca2Cu2+x O y ; microstructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In the Pb-doped Bi-Sr-Ca-Cu-O system, optimization of the composition and heat treatment conditions at which a greater amount of the high-T c phase forms has been reported in our early paper [1], where the temperature of zero resistance was 107K. Recently, we have achieved zero resistance at 117 K and observed an a.c. susceptibility step at around 150 K by changing the Cu composition in the Bi1.6Pb0.4Sr2Ca2Cu2+x O y system (x=0, 0.4, 0.8, 1.2, and 1.6).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617884
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  • 10
    Electronic Resource
    Electronic Resource
    CO2 laser annealing of plasma-deposited high-T c superconducting thick films (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 293-304 
    Details
    ISSN: 1572-9605
    Keywords: laser annealing ; Y-Ba-Cu-O ; plasma spray ; thick films ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Recent advances in the fabrication of high-T c superconducting thick films demand processing techniques which can eliminate film/substrate interdifiusion that occurs during subsequent post-annealing heat treatment after the film is deposited, thereby limiting the application of the thick films for devices. The present study evaluates laser annealing techniques for plasma-deposited Y-Ba-Cu-O thick films using a high-energy CO2 laser (10.6Μm) in a continuous wave mode. The results are compared with those obtained by conventional furnace annealing techniques necessary for post-heat treatment of as-deposited superconducting thick films. The high-T c superconducting phase is recovered by cationic diffusion during subsequent post-annealing heat treatment. Crystallographic phases and microstructural characterization have been performed using XRD, SEM, and EPMA analytical techniques. The significance of the technology lies in the elimination of film/substrate interdiffusion problems, thereby resulting in high-quality superconducting thick films. The technology will significantly reduce the post-annealing times usually required by conventional furnace annealing techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617880
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