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  • 1985-1989  (5)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Growth of high Tc superconducting Bi4(Ca,Sr)6Cu4O16+x crystals (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 249-251 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To determine intrinsic properties of the newly discovered Bi-Ca-Sr-Cu-O high Tc superconductors, single crystals are necessary. Compositions in this system have been heat treated to survey the melting temperatures and phase field in which superconductivity is detected. The nucleation and growth of the 85 K phase from the melted composition Bi4Ca3Sr3Cu4O16+x is observed to be a kinetically slow process which can be precluded by a sufficiently rapid quench, but post-anneals produce the 85 and 110 K phases in the quenched material. The melted composition (23% Bi2O3-46% CaO,SrO-31% CuO), after subsequent slow cooling, results in large discrete crystals of the 85 K superconducting phase and a residual flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100590
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Plasma oxidation of the high Tc superconducting perovskites (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 622-624 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A near room-temperature plasma oxidation process is shown to restore superconductivity and metalliclike behavior in oxygen deficient La2−x Srx CuO4−y and YBa2Cu3O7−x compounds. In the YBa2Cu3O7−x compound the conversion from an oxygen deficient n-type tetragonal to the p-type orthorhombic phase with a concomitant factor of 5×105 increase in room-temperature conductivity is also accomplished. This process is of technological importance because oxygen can be restored in these materials at temperatures compatible with device processing. Of scientific interest, the process allows us to carefully control the oxidation state and thereby systematically study the 90 and 55 K superconducting transitions in YBa2Cu3O7−x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98367
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of the dilute magnetic semiconductor Mn:CuInTe2 (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 2051-2053 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The properties of bulk polycrystalline p-type Mn:CuInTe2 (with up to 12% Mn substitution) have been examined using polarized light microscopy, x-ray energy dispersive analysis, optical spectrometry, van der Pauw technique, and superconducting quantum interference device magnetometer measurements. The compound (Cu1−xMnx)InTe2 is a tetragonal chalcopyrite with lattice constants nearly equal to that of CuInTe2. On the other hand, attempted substitution of Mn in In sites produces a second phase composed of Cu and Te. The band gap of Mn:CuInTe2 is larger than 0.92 eV. Most samples show phonon-limited mobility, with the highest mobilities occurring at ≈75 K. Samples with 3% Mn substitution in Cu sites are paramagnetic. At higher Mn concentration (9%〈x〈12%), the (Cu1−xMnx)InTe2 samples show antiferromagnetic coupling and a measured effective magnetic moment up to ≈5.4μB/Mn atom. Samples with attempted Mn substitution in In sites (from 3% to 9%) show anomalous magnetic behavior at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98289
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Study of liquid-infiltrated Nb-Sn superconducting composite wire by specific-heat measurements (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3978-3981 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of specific-heat and inductive Tc measurements on reacted liquid-infiltrated superconducting composite wires with an overall composition of Nb-8 at. % Sn are presented. It is found that approximately 23 wt. % of the reacted wire is high Tc A15 phase, a result not expected from the accepted equilibrium phase diagram. The relatively sharp superconducting transition at 18 K is indicative of a uniform stoichiometric Nb-25 at. % Sn composition in the A15 phase. The large fraction of high Tc material in these wires is due to taking advantage of the rapid diffusion of Nb in liquid Sn. From a detailed analysis of the specific heat, comments on the reaction process are made. Implications for the equilibrium phase diagram are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337520
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Bulk and thick films of the superconducting phase YBa2Cu3O7−y made by controlled precipitation and sol-gel processes (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2725-2729 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The synthesis of high-temperature superconducting oxides using solution chemistry has been investigated and physical properties are compared to ceramics obtained by conventional solid-state reactions. We report on controlled precipitation and sol-gel processes, both of which produce materials with particle sizes smaller than 5 μm. We find that the superconducting properties of the high Tc ceramics are affected by their manner of preparation, such that the transitions are slightly lower in temperature, but sharper, for samples made by solution rather than solid-state chemistry. The ability to prepare stable viscous gels provides an opportunity for obtaining large areas of superconducting coatings. For thick films on alumina or silicon substrates, contamination from the substrate is shown to be a problem. Finally, we observe that the sol-gel process lowers the synthesis temperature by 100 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340967
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    Paper (German National Licenses)
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