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  • 1
    Electronic Resource
    Electronic Resource
    Critical Current Anisotropy of Tl-1223 Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 21-22 
    Details
    ISSN: 1572-9605
    Keywords: Critical current anisotriopy ; thallium ; superconductor ; conductor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A comparative study of the critical current anisotropy of Tl-1223 conductors manufactured by different techniques, prepared from different compositions and originating from different research laboratories is presented and discussed. For highly oriented layers, with the magnetic field (B) parallel to the ab plane, the normalised critical current density (j) versus magnetic field characteristic shows very little drop of j value due to the intrinsic properties of the Tl-1223 phase, while all powder-in-tube conductors show a rapid drop of j value in fields as low as 10 mT. For all powder-in-tube conductors the anisotropy coefficient k shows a very pronounced minima at fields up to 30 mT followed by a monotonic decrease of anisotropy with increase of the magnetic field. This is due to poor grain alignment and a demagnetising effect in the powder-in-tube Tl-1223 tapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022605123242
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enhancement of Microstructural and Magnetic Properties by Li-doping in Tl,Pb-1223 Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 143-144 
    Details
    ISSN: 1572-9605
    Keywords: Tl based high Tc superconductors ; synthesis ; Li doping ; microstructure ; magnetization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Polycrystalline Tl0.5Pb0.5Sr2Ca2Cu3LiyOx samples were synthesized. After processing under the same conditions, the Li-doped samples (y = 0.2) showed an average grain size three times larger than that of a typical undoped Tl,Pb-1223 sample (y = 0), and a 30% increase in sample density. The irreversibility line has significantly shifted to higher field with Birr ( 77K) ≅ 12 tesla. The intragranular critical current densities, estimated through the Bean model, are higher in Li-doped samples in temperatures below 77K and external magnetic fields greater than 2 tesla. The Tc,onset, of the Li-doped samples are lowered by typically 2-5 K compared with the undoped samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022643626393
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Transport and Magnetic AC Losses in Ag/Tl-1223 Tape and the Effect of Mechanical Damage (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 145-146 
    Details
    ISSN: 1572-9605
    Keywords: HTc superconductors ; thallium tapes ; AC losses ; critical currents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In this paper we present the results of AC loss measurements on silver clad monocore tapes of Tl-1223 prepared by the powder-in-tube method. Losses arising from an external AC magnetic field are compared with those generated by AC transport currents (self-field losses). Critical current densities are derived from magnetic loss data and compared with those measured by the four point transport method. It was found that mechanically induced stresses (introduced by bending) only have a significant effect on the transport losses, via the critical current degradation. Such changes are not seen in measured magnetic losses, which are independent of mechanical stress, and remain unchanged, at least in the stress range used in our experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022695610463
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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