ISSN:
0392-6737
Keywords:
Superconducting materials
;
General properties
;
Critical currents
;
Material effects onT c,x, critical currents (including impurities, ion implantation etc.)
;
Conference proceedings
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02462197
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