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  • Articles  (28)
  • superconductivity  (28)
  • 1990-1994  (17)
  • 1985-1989  (11)
  • Electrical Engineering, Measurement and Control Technology  (28)
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  • Articles  (28)
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  • 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
    60-Hz AC losses in Ag-doped high-temperature superconductors (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 25-27 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7(Ag) ; superconductivity ; ac losses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract 60-Hz ac lossesP were measured at temperature 77 K for sintered powder (YBa2Cu3O7)1-x Ag x samples as a function of applied magnetic fieldh. Rod-shaped samples were cut from pellets forx= 0 and 0.05. The losses were measured in a uniform ac magnetic fieldh applied parallel to the sample surface. Measurements were made in fields up toh= 1000 A/cm rms at temperature 4.2 K and up toh=600 A/cm rms at temperature 77 K. The results may indicate an increase of the intergranular current density and are discussed in relation to the grain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617992
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of silver on the phase formation of the Bi-Pb-Sr-Ca-Cu-O superconductors (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 301-311 
    Details
    ISSN: 1572-9605
    Keywords: Ag substitution ; BPSCCO ; bismuth ; Raman spectroscopy ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effects of Ag substitution on the formation of the superconducting phases in the BPSCCO system have been investigated by Raman spectroscopy and XRD. The silver was found either to accelerate the formation of the 2212 phase or to reduce the formation temperature of the 2212 phase. Moreover, addition of even a small amount of silver (Bi∶Pb∶Ag=8∶2∶1) poisons or inhibits the formation of the 2223 phase. However, there is no apparent effect on theT c of both the 2212 and 2223 phases. In addition, the presence of silver does not alter the mechanism for the formation of the PBSCCO superconducting phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617631
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  • 8
    Electronic Resource
    Electronic Resource
    High-T c superconductivity and electronic band structure (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 547-553 
    Details
    ISSN: 1572-9605
    Keywords: van Hove singularities ; superconductivity ; cuprates ; doped fullerenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We review the main results of the van Hove scenario applied to superconducting cuprates. It is based on the assumption that in these materials, the Fermi level lies near a singularity in the density of states (DOS). This hypothesis has recently been confirmed experimentally. We show that this model explains many properties of the high-T c superconductors. We show that an anaogous model with a peak in the DOS may also be applied to the superconducting doped fullerenes. A general feature of the model is a very short coherence length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728457
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  • 9
    Electronic Resource
    Electronic Resource
    Two-band mechanism of superconductivity in dimeric hubbard models (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 589-591 
    Details
    ISSN: 1572-9605
    Keywords: Two-band ; pair transfer ; superconductivity ; dimer ; Hubbard model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In the two-chain Hubbard model the on-site Coulomb repulsion generates a remarkably large pair-transfer coupling constant between bonding and antibonding orbitals of a dimer made of the two sites lying on the opposite chains and linked by a transfer energy. It leads to a pair-transfer interaction between two bands composed of these orbitals, promoting superconductivity (SC). Since it is found to be as large as intraband Coulomb coupling constants, our previous work suggests that SC can occur in this model. In fact we have obtained a clear indication of SC in restricted-size systems carrying out the exact-diagonalization with 6 electrons and a variational diagonalization with up to 14. The SC occurs in suitable band situations for a wide range of on-site Coulomb energies. We also obtained such an SC indication in a two-dimensional Hubbard model. We mention some candidate materials substantiating the present mechanism and suggest it to be quite general.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728465
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  • 10
    Electronic Resource
    Electronic Resource
    Normal-state transport properties of fullerene superconductors (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 639-642 
    Details
    ISSN: 1572-9605
    Keywords: Alkali-metal-doped fullerenes ; normal-state transport ; superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The normal-state transport properties of alkali-metal-doped fullerene crystals are explored. The Hall effect has been measured in KxC60 from room temperature toT c . The electrical resistivityρ for K3C60 and Rb3C60 has been measured over a wide temperature range (20–650 K), and notable differences are observed for the materials at both low and high temperatures. The electrical resistivity of Rb3C60 has been measured in hydrostatic pressures up to 9 kbar. The resistivity is highly pressure sensitive. The transport results give an insight into the normal-state conduction mechanism and thus have consequences for the superconductivity mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728476
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