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Optimal formation and enhanced superconductivity of Tl-1212 phase (Tl0.6Pb0.4)(Ba,Sr)CaCu2O7

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Abstract

The effect of heating temperature on the formation of Tl-1212 phase with nominal starting composition (Tl0.6Pb0.4)(Ba,Sr)CaCu2O7 (Tl-1212) is reported. The Ba-bearing Tl-1212 phase is normally prepared at around 900 °C while with Sr-bearing sample is prepared at a much higher temperature of around 1000 °C. This work was conducted to determine the optimal temperature to synthesis the Tl-1212 phase when the sample contains Ba and Sr with 1:1 ratio. (Tl0.6Pb0.4)(Ba,Sr)CaCu2O7 samples were prepared using the solid-state reaction method via the precursor route. In the final preparation stage, the samples were heated at 850, 870, 900, 920, 950, 970 and 1000 °C in oxygen flow. X-Ray diffraction patterns showed that most samples consisted of a mixed (Tl0.6Pb0.4)(Ba,Sr)Ca2Cu3O9 (Tl-1223) and Tl-1212 phase except for the sample heated at 970 °C which showed a single Tl-1212 phase and the sample heated at 850 °C which showed the Tl-1223 phase. The transition temperature measured by four-probe method showed that the sample heated at 970 °C exhibited the highest onset temperature of 118 K and zero-resistance temperature of 100 K. This transition temperature is higher than the usually reported value for the Tl-1212 phase. AC susceptibility measurements also showed the 970 °C heated sample with the highest transition temperature Tcχ′ = 109 K. The interplay of ionic radius (Ba2+ and Sr2+) decreases of the unit cell volume and changes in the internal lattice strain enhanced the transition temperature and the formation of the Tl-1212 phase.

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Acknowledgements

We thank Nur Raihan Mohd Suib (UKM) for the assistance with the laboratory work. This research has been supported by the National Institute of Elite of Iran and Science and Research Branch, Islamic Azad University, Tehran, Iran. We thank Sharif University of Technology for the assistance with some of the measurements. RAS wishes to thank the Ministry of Higher Education of Malaysia for the Grant number FRGS/1/2017/STG02/UKM/01/1.

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Authors and Affiliations

  1. Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran

    M. G. Ranjbar & Mahmood Ghoranneviss

  2. School of Applied Physics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

    R. Abd-Shukor

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  1. M. G. Ranjbar
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  2. Mahmood Ghoranneviss
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  3. R. Abd-Shukor
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Correspondence to Mahmood Ghoranneviss.

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Ranjbar, M.G., Ghoranneviss, M. & Abd-Shukor, R. Optimal formation and enhanced superconductivity of Tl-1212 phase (Tl0.6Pb0.4)(Ba,Sr)CaCu2O7. Appl. Phys. A 124, 456 (2018). https://doi.org/10.1007/s00339-018-1838-4

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  • DOI: https://doi.org/10.1007/s00339-018-1838-4

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