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Volumn 276, Issue 5313, 1997, Pages 770-773

High critical-current density in the heavily Pb-doped Bi2Sr2CaCu2O(8+δ) superconductor: Generation of efficient pinning centers

Author keywords

[No Author keywords available]

Indexed keywords

BISMUTH COMPOUNDS; COPPER OXIDES; CRITICAL CURRENT DENSITY (SUPERCONDUCTIVITY); CRYSTAL MICROSTRUCTURE; ELECTRON MICROSCOPY; HIGH TEMPERATURE EFFECTS; LEAD; MAGNETIC FIELD EFFECTS; SINGLE CRYSTALS;

EID: 0031547974     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.276.5313.770     Document Type: Article
Times cited : (199)

References (37)
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    • Y. Kotaka et al., Physica C 235, 1529 (1994).
    • (1994) Physica C , vol.235 , pp. 1529
    • Kotaka, Y.1
  • 7
    • 1842332219 scopus 로고    scopus 로고
    • note
    • Two types of pinning centers have been characterized: point disorders (for example, neutron-or electron irradiation-induced defects, impurities, or oxygen vacancies) and correlated defects (for example, twin boundaries or columnar defects generated by heavy-ion irradiation). The former is effective at low temperature, whereas the latter plays a crucial role at high temperature.
  • 17
    • 0040991951 scopus 로고
    • Y. Ikeda et al., ibid. 165, 189 (1989).
    • (1989) Physica C , vol.165 , pp. 189
    • Ikeda, Y.1
  • 27
    • 1842401198 scopus 로고    scopus 로고
    • note
    • For the x = 0.4 crystal, about 10 fragments were examined in a microscope, and only one fragment exhibited a microstructure similar to that found in the x = 0.6 crystal. However, the domains in the x = 0.4 crystal were much smaller along the a axis (a few tens of nanometers) and were connected to each other to form meandering strings around the a axis.
  • 28
    • 1842287203 scopus 로고    scopus 로고
    • note
    • Recently, cross-sectional HREM observations with an incident beam parallel to the a axis were performed on the x = 0.6 crystal. The results indicated that the typical length of the modulation-free domains along the c axis is a few micrometers, which means that the domains have a thin, platelike shape.
  • 29
  • 32
    • 1842287443 scopus 로고    scopus 로고
    • note
    • It would be important to measure the angular dependence of pinning forces, because the domains have an anisotropic shape within the basal plane. The largest flux pinning should occur when the applied magnetic field is perpendicular to the b axis.
  • 33
    • 1842325689 scopus 로고    scopus 로고
    • in preparation
    • J. Shimoyama et al., in preparation.
    • Shimoyama, J.1
  • 34
    • 1842286651 scopus 로고    scopus 로고
    • note
    • Recently, we detected a significant difference in the Pb content by using analytical electron microscopy.
  • 35
    • 1842404902 scopus 로고    scopus 로고
    • note
    • 7-δ, where the coherence length may be reduced due to electron scattering.
  • 37
    • 1842406705 scopus 로고    scopus 로고
    • note
    • We thank Y. Matsuda (Hokkaido University) for reviewing the manuscript and Rigaku Industrial Corporation for help with the fluorescence x-ray composition analysis. Supported in part by CREST (Core Research for Evolutional Science and Technology) of Japan Science and Technology Corporation (JST) and by the Original Industrial Technology R&D Promotion Program from the New Energy and Industrial Technology Development Organization (NEDO) of Japan.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.