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  • 1995-1999  (2)
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  • 1995-1999  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Irreversibility line and granularity in Chevrel phase superconducting wires (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 2181-2183 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Chevrel phase monofilamentary wire was hot isostatically pressed (HIPed) under 2 kbar of argon pressure at 940 °C for 1.5 h. Transport critical current densities (Jc) were measured from 2.7 to 11 K, in magnetic fields up to 15.5 T. Compared to previous results for a sample HIPed at 900 °C for 0.5 h, the irreversibility field [Birr(T)] has been improved by 3 T to 34.5 T at 4.2 K. The Jc has also been enhanced at 14 T and 4.2 K to the highest reported value of 6.7×108 A/m2. The reduced pinning force data show excellent temperature scaling. Resistivity measurements in high magnetic fields confirm an improvement in Birr(T) and provide evidence that the improved properties are due to better superconducting properties at the grain boundaries. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368358
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  • 2
    Electronic Resource
    Electronic Resource
    Enhancement of the critical current density in Chevrel phase superconducting wires (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 6277-6284 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The critical current densities Jc of Chevrel phase wires with niobium as an antidiffusion barrier were measured in magnetic fields up to 24 T. At 20 T and 1.9 K, Jc reaches 5.4×108 A/m2 and decreases slightly down to 3.1×108 A/m2 at 24 T. A wire with a 20% superconducting cross section has been successfully drawn and its overall critical current density Jcov exceeds 100 A/mm2 at 1.9 K up to a magnetic field slightly above 20 T. This demonstrates the ability of Chevrel phase wires to be used in high magnetic field applications. Moreover, some parts of the coil have certainly higher Jc, since Jc is very often limited by a thermal excursion of the entire coil. The effective upper critical field μ0Hc2*, deduced from the magnetic field dependence of Jc, is too low compared to the expected bulk value, indicating that superconducting properties at the grain boundaries are still degraded. If the bulk μ0Hc2 can be restored at the grain surfaces, Jcov should be higher than 100 A/mm2 up to at least 30 T. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364416
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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