Annealing effects on fluctuation-induced conductivity of (Cu0.5Tl0.25Hg0.25)Ba2Ca3Cu4O12-δ superconductor

Babar Shabbir, Adnan Younis, Nawazish Ali Khan

Research output: Contribution to journalArticlepeer-review


In the light of the Aslamazov-Larkin theory of fluctuation-induced conductivity (FIC), the excess conductivities of as-prepared, nitrogen- post-annealed, oxygen-post-annealed, and air-post-annealed samples of (Cu0.5Tl0.25Hg0.25)Ba2Ca3Cu4O12-δ have been determined. It is observed from FIC measurements that the crossover of a three-dimensional (3D) to a two-dimensional (2D) behavior of fluctuations is shifted to higher temperatures by the postannealing of samples in nitrogen, oxygen, and air. We have accredited this behavior to an increase in the grain size and the improved carrier concentration in the conducting CuO2 planes. In addition, it is also noted that, after the post-annealing of samples in nitrogen, oxygen, and air, the width of the three-dimensional region of fluctuations is also enlarged. Furthermore, two distinct parameters (coherence length and interplanar coupling) are also estimated by the Lawrence-Doniach equations and found to be increased by the post annealing in nitrogen, oxygen, and air.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalUkrainian Journal of Physics
Issue number3
Publication statusPublished - 2011
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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