Enhanced Magnetic Properties in Cu0.5Tl0.5Ba2Ca2Cu3O10−δ Superconductor Doped with Carbon Nanotubes

M. Aftab Rafique, Sadaf Aziz, Najmul Hassan, Nawazish A. Khan

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Fluctuation-induced conductivity (FIC) analysis in the critical fluctuation region (cr), three-dimensional (3D), two-dimensional (2D), and zero-dimensional (0D) regions is reported for undoped and carbon nanotubes (CNT)-doped Cu0.5Tl0.5Ba2Ca2Cu3O10−δ (CuTl-1223) superconductors. Samples were synthesized by well-known solid-state reaction method by adding CNT up to 7 wt %. The X-ray diffraction data confirms the single-phase orthorhombic structures following PMMM space group for all the samples. The scanning electron microscope (SEM) images reveal that the carbon nanotubes are present in the spaces between the grains and connect the grains electrically to help the intergranular current flow. From FIC analysis, it was found that the width of critical and 3D regimes are shrunken with the increased CNT doping in the final compound. Also, the coherence length (ξc(0)), the Fermi velocity (VF), and the coupling constant (J) are suppressed with increased CNT doping except for the 0.25 wt % doped sample. The decrease in important superconductivity parameters most likely arises due to low CNT doping which indeed functions as columnar defects that are produced by heavy ion irradiation. In this analysis, we also found that the critical magnetic fields (Bc(0), Bc1(0)) and critical current density (Jc(0)) were found to increase with increased CNT concentration. These observations suggest that addition of CNT (efficient pinning centers) to CuTl-1223 compounds improve the electrical connection between the superconducting grains to result in the improvement of magnetic properties of the final compound.

Original languageEnglish
Pages (from-to)2427-2434
Number of pages8
JournalJournal of Superconductivity and Novel Magnetism
Issue number11
StatePublished - 19 Oct 2014
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgments The Higher Education Commission of Pakistan (HEC) through project no. 20-1482/R&D/09-1472 and International Center for Theoretical Physics (ICTP) through project number PRJ-27 are acknowledged for their financial supports.

Publisher Copyright:
© 2014, Springer Science+Business Media New York.


  • Chemical synthesis
  • Magnetic properties
  • Superconductors
  • X-ray diffraction


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