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Enhancement in superconducting transition temperature and Jc values in Na-doped Bi2Sr2Ca1Cu2−xNaxOy superconductors

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Abstract

The effects of Na substitution on the properties of Bi2Sr2Ca1Cu2−xNaxOy were investigated. The prepared samples are characterized using X-ray powder diffraction, scanning electron microscope, DC electrical resistivity and magnetic-hysteresis loop measurements. It has been found that with increasing Na doping for Cu, the transition temperature gradually increase while crystal lattice parameters slightly change. Magnetic hysteresis measurements have shown that the hysteresis loops of doped samples are greater than the undoped sample. In addition, significant enhancement has been observed in the Jc values of Na-doped samples, which were calculated from the M–H curves by using Bean’s critical state model.

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Acknowledgments

All samples have been prepared in the MEİTAM Central Laboratory in Mersin University in Turkey. SEM measurements have been made in the MEİTAM Central Laboratory in Mersin University, the other measurements in this study have been made in the METU Central Laboratory in Middle East Technical University in Ankara in Turkey. On the other hand, I wish to thank M.Sc. Aynur GÜRBÜZ in the MEİTAM Central Laboratory and M.Sc. Ali GÜZEL, Geological Engineer Pınar TOKMAKKAYA, Dr. Ibrahim ÇAM in the METU Central Laboratory and for their experimental support and very meticulous work.

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Correspondence to Berdan Özkurt.

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Özkurt, B. Enhancement in superconducting transition temperature and Jc values in Na-doped Bi2Sr2Ca1Cu2−xNaxOy superconductors. J Mater Sci: Mater Electron 24, 2426–2431 (2013). https://doi.org/10.1007/s10854-013-1113-6

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  • DOI: https://doi.org/10.1007/s10854-013-1113-6

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