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Excess Conductivity and Superconducting Fluctuation Analysis of Cr-Substituted Tl-1223 Type Phase (Tl1−x Cr x )Ba2Ca2Cu3O9−δ (x = 0.4–0.8)

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Abstract

The Tl-1223 type phase superconductor with starting compositions (Tl1−x Cr x )Ba2Ca2Cu3O9−δ (x = 0.4–0.8) has been prepared by the solid-state reaction method. The Aslamazov–Larkin (AL) theory was used to investigate the dimension of fluctuation-induced conductivity λ. The coherence length \(\xi _{\mathrm {c}}\left (0 \right )\) Josephson coupling J, and anisotropy γ of the samples were calculated by using the Lawrence–Doniach (LD) theory. The highest T c onset and T c zero were observed in the x = 0.6 sample. All samples showed the Tl-1223 as the dominant phase. Cr substitution induced 2D to 3D conductivity transition, and the highest transition temperature, T 2D-3D, was observed for x = 0.5. The LD model showed a decrease in the coherence length, \(\xi _{\mathrm {c}}\left (0 \right )\) and interlayer coupling for x = 0.6 and 0.7 samples These results showed that factors other than J and ξ c(0) are more important in optimizing the superconducting transition temperature. Our results showed that excess conductivity occurs at a higher temperature for a higher- T c superconductor.

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Acknowledgments

The authors thank the Ministry of Higher Education of Malaysia (grant no. FRGS/2/2013/SG02/UKM/01/1) and Universiti Kebangsaan Malaysia under grant no. UKM-AP-2015-006.

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Authors and Affiliations

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

    M. G. Ranjbar & R. Abd-Shukor

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

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Ranjbar, M.G., Abd-Shukor, R. Excess Conductivity and Superconducting Fluctuation Analysis of Cr-Substituted Tl-1223 Type Phase (Tl1−x Cr x )Ba2Ca2Cu3O9−δ (x = 0.4–0.8). J Supercond Nov Magn 29, 2235–2240 (2016). https://doi.org/10.1007/s10948-016-3539-6

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