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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 會議論文  >  Anisotropic superconducting properties for c-axis aligned powders of the (2223) compound (Bi,Pb)2Ca2Sr2Cu3O10+δ

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/56032

    Title: Anisotropic superconducting properties for c-axis aligned powders of the (2223) compound (Bi,Pb)2Ca2Sr2Cu3O10+δ
    Authors: Ku, H.C.;Shi, J.B.
    教師: 古煥球
    Date: 1992
    Publisher: American Institute of Physics
    Relation: Superconductivity and its Applications. 5th Annual Conference, Buffalo, NY, USA, 24-26 Sept. 1991, Pages 467-476
    Keywords: high temperature superconductor
    c-axis aligned powders
    anisotropy ratios
    initial magnetization
    hysteresis measurements
    Abstract: Anisotropic superconducting properties of aligned powders of the bismuth-2223 (Bi,Pb)2Ca2Sr2Cu3O10+δ compound are reported. The c-axis aligned powders embedded in epoxy are prepared in a 9.4 tesla applied magnetic field at room temperature. Temperature dependence of the anisotropy ratio χc(T)/χab(T) is derived from zero-field-cooled (ZFC) susceptibility measurements using small applied fields parallel or perpendicular to the orthorhombic c-axis. Large anisotropy ratios of 17.9 near Tc of 108 K and 9.8 at 5 K are observed. Field dependence of the anisotropy ratio χc(H)/χab(H) is derived from the initial magnetization Mi(H) in the hysteresis measurements for H⊥c and H∥c at 5 K. Anisotropic intragrain critical current densities Jc up to 4 kG are estimated. Anisotropic irreversibility lines Hr(T) due to thermal fluctuation are determined from the merging point of ZFC and FC susceptibility measurements in various applied fields with H⊥c and H∥c. The anisotropy ratio Hr(⊥c)/Hr(∥c) decreases sharply from 13.6 at 100 K to a low value of 3.2 at 80 K and 3.1 at 70 K. The 3D-like power law Hr=a·(1-T/Tc)n is valid only in the low field region (⩽200 G) with n=2.19 for H⊥c and 2.99 for H∥c. In the higher field region up to 4 kG, the temperature dependence of Hr(T) lines changes into a 2D-like exponential function Hr=b·exp(-T/T0) due to the breakdown of the interlayer and/or intralayer coupling of the conduction channel, with T0=14.2 K for H⊥c and 13.7 K for H∥c
    URI: http://www.aip.org/
    Appears in Collections:[物理系] 會議論文

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