Il Nuovo Cimento D

, Volume 16, Issue 10–11, pp 1941–1946 | Cite as

Shielding current density in Mg-doped YBCO-123 as determined by a.c. magnetic-susceptibility measurements

  • L. Raffo
  • R. Caciuffo
  • D. Rinaldi
  • F. Licci
Article
  • 42 Downloads

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 currents J 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 of J s. At H 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 of J 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.

PACS

74.70 Superconducting materials 

PACS

74.30 General properties 

PACS

74.60.Jg Critical currents 

PACS

74.60.Mj Material effects on Tc, x, critical currents (including impurities, ion implantation etc.) 

PACS

01.30.Cc Conference proceedings 

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Copyright information

© Società Italiana di Fisica 1994

Authors and Affiliations

  • L. Raffo
    • 1
    • 2
  • R. Caciuffo
    • 1
  • D. Rinaldi
    • 1
  • F. Licci
    • 2
  1. 1.Dipartimento di Scienze dei Materiali e della Terra dell'UniversitàAnconaItaly
  2. 2.Istituto MASPECCNRParmaItaly

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