Abstract
In this study, Na-substituted Bi2Sr2Ca0.9Na0.1 Cu2O superconductor samples were prepared by a polymer solution method. Three different sintering temperatures (850, 860, and 870 °C) were used to study the effect of Na substitution. The samples have been characterized using X-ray diffraction, scanning electron microscopy (SEM), DC electrical resistivity, and DC magnetic measurements. Magnetoresistivity measurements have shown a broadening of the superconducting transition under magnetic field which is explained on the basis of the thermally activated flux flow (TAFF) model. The calculated flux pinning energies of the samples varied from 0.17 to 0.02 eV by means of increasing magnetic field 0 to 9 T. The upper critical magnetic field H c2(0) and the coherence length ( ζ(0)) at T = 0 K were calculated using the resistivity data. H c2(0) and ξ(0) values have been calculated as 194, 144, and 139 T and 15.5, 15.2, and 13 Å at 850, 860, and 870 °C, respectively. TAFF model has shown Bi2Sr2Ca0.9Na0.1Cu2O8+y flux pinning energies are 0.015 eV at 9 T in all cases, while they were 0.165, 0153, and 0.149 eV at 0 T for samples sintered at 850, 860, and 870 °C, respectively.
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This work is supported by the Research Fund of Çukurova University, Adana, Turkey, under grant contracts no. FEF2013YL18.
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Gürsul, M., Ekicibil, A., Özçelik, B. et al. Sintering Effects in Na-Substituted Bi-(2212) Superconductor Prepared by a Polymer Method. J Supercond Nov Magn 28, 1913–1924 (2015). https://doi.org/10.1007/s10948-015-2977-x
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DOI: https://doi.org/10.1007/s10948-015-2977-x