Role of mobile charge carriers and fluctuation induced conductivity in (Cu 0.5Tl 0.5-x K x )Ba 2Ca 3Cu 1Zn 3O 12-δ Superconductor

M. Mumtaz, Nawazish A. Khan, S. M. Hasnain, Adnan Younis

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The main role played by mobile carriers and fluctuation induced conductivity (FIC) in (Cu 0.5Tl 0.5-x K x )Ba 2Ca 3Cu 1Zn 3O 12-δ (x=0, 0.25) superconductor samples are analyzed in the light of the Aslamazov-Larken (AL) theory. The enhancement of three-dimensional (3D) conductivity and grain size is achieved with K-doping at Tl sites in the (Cu 0.5Tl 0.5-x K x )Ba 2O 4-δ charge reservoir layer, which are further improved by post-annealing the samples in oxygen. The improvement of these factors causes the increase in cross-over temperature (T o), zero resistivity critical temperature {T c(R=0)} and T c(onset) of diamagnetism to their higher values. We have also evaluated the exponents (λ 2D and λ 3D), zero temperature coherence lengths ξ c(0), and interlayer coupling (J) for these samples and tried to correlate them to the superconductivity order parameters.

Original languageEnglish
Pages (from-to)1939-1945
Number of pages7
JournalJournal of Superconductivity and Novel Magnetism
Volume24
Issue number6
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

Keywords

  • (Cu Tl K )Ba Ca Cu Zn O superconductor
  • Doping
  • Fluctuation induced conductivity
  • Post-annealing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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