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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of high-temperature superconducting wires on the basis of YBa2Cu3Ox (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 882-884 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the powder-in-tube technique, superconducting monocore and multicore wires have been produced with several outer diameters (the thinnest one was (1)/(10) mm) and a length of more than 1000 m. The procedure was optimized for achieving high-transport current density. Three parameters were varied, namely, wire diameter, sinter duration, and sinter temperature. The most powerful wire prepared had a critical transport current density of 750 A/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346778
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  • 2
    Electronic Resource
    Electronic Resource
    Flux pinning in high-temperature superconducting multicore wires based on Bi2Sr2CaCu2Ox (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1030-1032 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the powder-in-tube technique superconducting 19-core wires have been produced with several diameters (down to 1/10 mm) and a length of some hundred meters. These wires show critical current densities of about 13500 A/cm2 in zero magnetic field and 6000 A/cm2 in a parallel field of 10 T at 4.2 K, respectively. For high magnetic field application it is necessary to understand the flux pinning mechanism. For this purpose the dissipative flux motion below Tc has been studied. The results of dc measurements were parametrized in the framework of flux creep. Using the Anderson model [published in Phys. Rev. Lett. 9, 309 (1962)], we find an activation energy inversely proportional to the square root of the magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351828
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  • 3
    Electronic Resource
    Electronic Resource
    Scaling of the volume pinning force in superconducting wires and tapes based on Bi2Sr2CaCu2Ox (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7446-7451 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Silver-sheathed Bi2Sr2CaCu2Ox wires and tapes were fabricated by the powder-in-tube method. The wires show critical current densities of about 18 000 A/cm2 in zero magnetic field and 5300 A/cm2 in a field of 23 T at 4.2 K, respectively. A detailed study of the critical current density as a function of the temperature and the magnetic field resulted in a scaling behavior of the derived volume pinning force FV, which approximately obeys the formula FV≈H*h0.75(1−h)2.75. Here H* represents the irreversible field and h=H/H* is the scaling field. Further, the critical current densities of our textured tapes were measured. In zero magnetic field they reach critical current densities of about 43 000 A/cm2. In a magnetic field applied perpendicularly to the current direction the critical current density shows an anisotropic behavior with respect to the direction of the magnetic field. For a magnetic field of 23 T applied parallel to the tape plane the tapes reached critical current densities of about 15 000 A/cm2 at 4.2 K. In the unfavorable direction, the magnetic field is applied perpendicularly to the tape plane, the current density was reduced to 10 000 A/cm2. The volume pinning force in the tapes was investigated versus the magnetic field at 4.2 K and a power-law behavior FV≈Hp with p=0.75 for H parallel and p=0.55 for H perpendicular to the tape plane was found. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357971
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  • 4
    Electronic Resource
    Electronic Resource
    Single crystals of Hg-12(n−1)n and infinite layer-CaCuO2 obtained at gas pressure P=10kbar (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 515-518 
    Details
    ISSN: 1572-9605
    Keywords: Single crystals ; high pressure synthesis ; structure ; HgBaCaCuO, CaCuO2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single crystals of Hgl-xPbxBa2Can-lCunO2n+2+ς(x=0,0.2,0.5; n=2,3,4,5) and infinite layer CaCuO2 compounds have been grown using a high gas pressure. Resistivity measurements have been performed in fields up to 10 T. The Hg0.8Pb0.2-1234 single crystals of a size up to 0.5×0.5 mm2 have a T c onset of 130 K. Single crystals of CaCuO2 of a size up to 2×1 mm2 have a T c onset between 70 and 100 K. X-ray structural refinements have been performed on the CaCuO2 and HgPb-12(n−1)n single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722844
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