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Synthesis and Para-conductivity Analyses of TlBa2(Ca 3 − y Mg y )Cu4 O 1 2 − δ Superconductors

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Abstract

TlBa 2(Ca 3−yMg y)Cu 4 O 12−δ (y=0,0.5,1.0, 1.5,2) superconductors are synthesized at normal pressure, and the influence of doped Mg atoms on the superconductivity parameters at the microscopic level is investigated by carrying out para-conductivity analyses of conductivity data. The samples have shown tetragonal structure, and the unit cell volume decreases with increased Mg doping. The onset temperature of superconductivity [ T c(onset)] and zero resistivity critical temperature [ T c(R=0)] decreases with Mg. Maximum magnitude of diamagnetism is observed in the samples with Mg of y=2. The apical oxygen mode of the type Tl-O A-Cu(2) and CuO 2 planar oxygen modes are softened as observed in fourier transform infrared spectrometer (FTIR) absorption measurements. The fluctuation-induced conductivity (FIC) analyses of conductivity data have shown the enhancement of inter-plane coupling and coherence length along the c-axis. These analyses have shown an increase in the coherence length along the c-axis and the inter-layer coupling J. The enhancement of inter-plane may possibly be arising due to a small decrease in the value of the order parameter of the carriers from ∣ψ∣ 2=1 in the CuO 2 planes in Mg-doped samples. The values of B c0(T), B c1(T), J c(0) are suppressed with the increased incorporation of Mg, which most likely arises due to the weak coupling of the grains induced by Mg doping.

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Acknowledgments

The Higher Education Commission (HEC) of Pakistan through project no. 20-1482/R&D/09-1472 is acknowledged for their financial support.

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Authors and Affiliations

  1. Materials Science Laboratory, Department of Physics, Quaid-i-Azam University, Islamabad, 45320, Pakistan

    Nawazish A. Khan, M. Shamraiz & Saleem Abbass

  2. Department of Electronics, Quaid-i-Azam University, Islamabad, 45320, Pakistan

    Azhar A. Rizvi

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  1. Nawazish A. Khan
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  2. M. Shamraiz
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  3. Saleem Abbass
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  4. Azhar A. Rizvi
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Correspondence to Nawazish A. Khan.

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Khan, N.A., Shamraiz, M., Abbass, S. et al. Synthesis and Para-conductivity Analyses of TlBa2(Ca 3 − y Mg y )Cu4 O 1 2 − δ Superconductors. J Supercond Nov Magn 27, 2005–2010 (2014). https://doi.org/10.1007/s10948-014-2569-1

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  • DOI: https://doi.org/10.1007/s10948-014-2569-1

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