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  • 1
    Digitale Medien
    Digitale Medien
    Shielding current density in Mg-doped YBCO-123 as determined by a.c. magnetic-susceptibility measurements (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1941-1946 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Superconducting materials ; General properties ; Critical currents ; Material effects onT c,x, critical currents (including impurities, ion implantation etc.) ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary High-resolution a.c. magnetic-susceptibility measurements have been performed on sintered samples of Mg-doped YBCO superconductors YBa2(Cu1−x Mg x )3O7−δ (δ≤0.08, 0≤x≤0.1). An estimation of the intergranular shielding currentsJ s (T, H d.c.) has been obtained by separating the grains and coupling-junctions contributions to the measured susceptibility. The results show that Mg doping increases the weak links weight and reduces the values ofJ s. AtH d.c.=0,J s (T, 0) follows a power law of the type (1−T/T c)β, with β varying from 2 (undoped sample) to about 5 (x=2.5%). The dependence ofJ s on the applied d.c. magnetic field can be fitted to a Lorentzian lineshape whose width appears to be independent of the substitution level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462197
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Correlations between microstructure and a.c. magnetic response of bulk superconducting YBa2Cu3O7−x (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 381-391 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Superconducting materials ; General properties ; Critical currents
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary The magnetic response of granular superconducting YBCO samples with different grain sizes is reported. The analysis is carried out by measuring the low-frequency a.c. magnetic susceptibility as a function of the temperature with an applied magnetic field of amplitude ranging between 0.4 and 800 A/m. The observed magnetic behaviour is interpreted in terms of grain size and weak-links properties. The experimental results evidence the influence of the sample microstructure on the magnetic susceptibility. The intergranular and intragranular onset temperatures are compared with the critical temperature of the samples obtained by means of electrical-resistivity measurements. The temperature dependence of the intergranular critical current density is derived from the susceptibility data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02457340
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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