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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Tl-based "2234'' superconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2347-2350 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nearly single-phase samples of superconducting Tl–Ba–Ca–Cu–O "2234'' were successfully synthesized. The sample sintered in air had Tc of 112 K. Post-annealing of the sintered sample in a high-pressure oxygen gas made its Tc increase up to 115 K. The sample sintered in argon gas had Tc of 90 K. The thermoelectric power (TEP) of the sample was also measured. All the samples showed positive TEP signals. The magnitude of TEP signal decreased as Tc increased. Thus, it was likely that the as-sintered 2234 phase was in an under-doped state with respect to the optimum carrier concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351087
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  • 2
    Electronic Resource
    Electronic Resource
    Irreversibility line for a Pb-doped Hg-Ba-Ca-Cu-O superconductor (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1301-1303 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By measuring the magnetization hysteresis, we studied the critical current density, Jc, and irreversibility fields, Hirr, of a c-axis aligned Hg-Ba-Ca-Cu-O sample doped with Pb containing the Hg-1223 phase as the main phase. Anisotropy in ΔM was clearly observed in two different magnetic field directions. Even though the Hg-1223 phase contains three CuO2 sheets, the Hirr vs [1-(T/Tc)] curve was located at roughly the same positions as those reported for the Hg-1201 and Hg-1212 phases, indicating that the higher Tc phase, i.e., Hg-1223, is advantageous to the other phases in practical uses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111941
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  • 3
    Electronic Resource
    Electronic Resource
    Pb-doping effect on irreversibility fields of HgBa2Ca2Cu3O8+δ superconductors (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2105-2107 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We prepared nearly single-phase polycrystalline samples of HgBa2Ca2Cu3O8+δ(Hg-1223) without and with Pb doping, i.e., Pb-free Hg-1223 and (Hg0.8Pb0.2)-1223, by means of a sample encapsulation technique. According to quantitative energy dispersive x-ray spectroscopy analyses and iodometric oxygen titration, the Pb-free Hg-1223 and the (Hg0.8Pb0.2)-1223 sample were identified to be Hg0.97Ba2.00Ca2.04Cu3.00O8.33 and (Hg0.79Pb0.29)Ba2.00Ca1.98Cu2.94O8.42, respectively. The highest Meissner-signal onset temperatures for the Pb-free Hg-1223 (after post-annealing in O2 gas) and the (Hg,Pb)-1223 (as-sintered) sample were observed at 135.4 and 132.0 K, respectively. The difference in the irreversibility fields (Hirr) for both samples was very small at temperatures above 80 K, while, at temperatures below 70 K, the Hirr versus T curve for the (Hg,Pb)-1223 sample shifted toward the higher field side. Thus, Pb doping was effective for the improvement of magnetic property of Hg-1223 superconductors, at least, at temperatures below 70 K. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112807
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  • 4
    Electronic Resource
    Electronic Resource
    New high-pressure Sr-Ca-Cu-O compounds and their superconducting properties (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 55-58 
    Details
    ISSN: 1572-9605
    Keywords: Sr-Ca-Cu-O superconductor ; high-pressure synthesis ; oxidizer ; “0223” structure ; “infinite-layer” structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract It is shown for (Sr, Ca)1−y CuO2.00+z (nominal composition) superconductors fabricated under a high pressure of 5 GPa and at 930°C that, as z increases, the Meissner fraction increases from a few percent to 20% and then starts to decrease. In the X-ray powder diffraction pattern for the sample with the maximum Meissner fraction, it is obvious that the “infinite-layer” structure has been decomposed and a new structure becomes the major phase. It appears that the new structure is the “0223” structure which consists of rock-salt and the “infinite-layer” type blocks. This material is likely to be a new superconducting cuprate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730368
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  • 5
    Electronic Resource
    Electronic Resource
    Transport and Cu NMR studies of charge and spin dynamics in PrBa2Cu4O8 (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 437-442 
    Details
    ISSN: 1573-7357
    Keywords: 74.72.Bk ; 72.15.−v ; 76.60.−k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The charge and spin dynamics in PrBa2Cu4O8 are investigated by means of transport and Cu NMR measurements. The magnetoresistance was found to be very small at high temperatures and increase rapidly with decreasing temperature below ∼100 K, which may be ascribed to the dimensional crossover from one to two dimensions in the charge transport in the CuO double chains. While the NMR signal from the chain Cu sites persists down to 4.2 K without any appreciable line broadening, the signal from the planar Ce sites disappears below ∼250 K indicating the long-range antiferromagnetic order of plane Cu moments. This is consistent with the view of metallic conduction along the quasi one-dimensional CuO chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768425
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