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Research Article | Open Access

Superconducting parameter determination for (Co0.5Zn0.5Fe2O4)x/Cu0.5Tl0.5-1223 composite

M. ME. BARAKATa( ), N. AL-SAYYEDb, R. AWADb, A. I. ABOU-ALYa
Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt
Physics Department, Faculty of Science, Beirut Arab University, Beirut, Lebanon
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Abstract

The addition of magnetic Co0.5Zn0.5Fe2O4 nanoparticles to the superconducting Cu0.5Tl0.5-1223 phase has been used to investigate the electrical resistivity behavior of the composite above the superconducting transition temperature Tc. This was studied according to the opening of spin gap and fluctuation conductivity. The results indicated that the pseudogap temperature (T*) and superconducting fluctuation temperature (Tscf) change by increasing the addition of Co0.5Zn0.5Fe2O4 nanoparticles. It was found that T* is related to hole carrier concentration P and it also depends on the antiferromagnetic fluctuation affected by magnetic nanoparticles. The excess-conductivity analysis showed four different fluctuation regions started from high temperature up to Tc, and they were denoted by short wave (sw), two-dimensional (2D), three-dimensional (3D), and critical (cr) fluctuations. The crossover temperature between 3D and 2D (T3D–2D) in the mean field region was decreased by increasing the addition of Co0.5Zn0.5Fe2O4 nanoparticles, in accordance with the decrease in Tscf with x. The coherence length at 0 K along c-axis ξc(0), effective layer thickness of the 2D system d, and inter-layer coupling strength J were estimated as a function of Co0.5Zn0.5Fe2O4 nanoparticle addition. Moreover, the thermodynamics, lower and upper critical magnetic fields, as well as critical current density have been calculated from the Ginzburg number NG. It was found that the low concentration of Co0.5Zn0.5Fe2O4 nanoparticles up to x = 0.08 wt% improves the superconducting parameters of Cu0.5Tl0.5-1223 phase. On the contrary, these parameters were deteriorated for (Co0.5Zn0.5Fe2O4)x/Cu0.5Tl0.5-1223 composite with x > 0.08 wt%.

Keywords

Co0.5Zn0.5Fe2O4 nanoparticlesCu0.5Tl0.5-1223 phasepseudogap temperaturefluctuation conductivity

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Journal of Advanced Ceramics
Volume 5 Issue 3,
September 2016
Pages 210-218
DOI: 10.1007/s40145-016-0192-2
Cite this article:
BARAKAT MM, AL-SAYYED N, AWAD R, et al. Superconducting parameter determination for (Co0.5Zn0.5Fe2O4)x/Cu0.5Tl0.5-1223 composite. Journal of Advanced Ceramics, 2016, 5(3): 210-218. https://doi.org/10.1007/s40145-016-0192-2

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Received: 27 February 2016
Revised: 10 May 2016
Accepted: 15 May 2016
Published: 21 August 2016
© The author(s) 2016

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