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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Anisotropy and irreversibility line of iodine intercalated Bi2Sr2CaCu2O8+δ single crystals (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 3284-3286 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A comparative study of the superconducting properties of pristine and stage 1 iodine intercalated Bi2Sr2CaCu2O8+δ single crystals is presented. We find the anisotropy of the penetration depth to be significantly reduced after intercalation. Specifically, the penetration depth perpendicular to the CuO2 planes is dramatically decreased, by about 60%. Reducing the anisotropy improves the position of the irreversibility line in the low field region where pinning is weak. However, in high fields the position of the irreversibility line is depressed. This can be explained by the influence of strong flux pinning. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112438
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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
    Postmortem MRI of the spinal cord in multiple sclerosis (1994)
    Springer
    Neuroradiology 36 (1994), S. 625-626 
    Details
    ISSN: 1432-1920
    Keywords: MRI-Spinal cord-Brain stem ; Demyelination ; Multiple sclerosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Postmortem magnetic resonance imaging (MRI) of the spinal cord and the brainstem in a patient with multiple sclerosis are compared with the histopathological findings. Abnormal high signal intensity areas on T2-weighted images correspond precisely to demyelinated areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00600425
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Application of151Eu Mössbauer spectroscopy to studies of electric field gradients in high-temperature superconductors (1994)
    Springer
    Hyperfine interactions 93 (1994), S. 1635-1639 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The rare-earth site of samples having the compositions (Fe,Cu)Sr2(Eu,Ce) n Cu2O4+2n+z (n=2 and 3) were studied by151Eu Mössbauer spectroscopy. The results obtained are compared with measurements of EuBa2Cu3O7−δ (1∶2∶3) and Bi2Sr2(Ca1−yEuy)Cu2O8+E (2∶2∶1∶2) samples. The full quadrupole Hamiltonian of the 21.5-keV γ-transition was applied in analyzing the measured spectra. Simultaneous fitting of spectra recorded from crystallites oriented in various directions was used to determine the hyperfine parameters of then= 2 and 3 samples. Two different electric field gradients, not discernible in simple random crystallite measurements, were obtained for then=3 series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072920
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