Abstract
We report here the structural and superconducting properties of Bi2Sr2CaY x Cu2 O y superconductors with various x values (0.00 ≤x≤ 0.50) by using the resistivity and ac susceptibility measurements. It is found that addition of Y 3+ does not influence the phase purity of Bi:2212, while c-parameter and orthorhombic distortion are affected. Furthermore, the critical temperatures T c(R= 0) are increased from 92 K for Y = 0 up to 106 K by 0.15 of Y, followed by a decrease with increasing Y up to 0.50. It is interesting to note the resistivity of the samples with Y = 0.075 and 0.15 reaching to true zero value only at low dc currents up to 2 mA. Interestingly, the onset temperature of diamagnetism obtained from susceptibility data remains nearly unchanged at 94 K up to Y = 0.30, flowed by a decrease to 86 K at Y = 0.50. The superconducting volume fraction and critical currents are improved by Y addition up to 0.15, followed by a decrease with increasing Y up to 0.50. These results are explained in terms of the effects of excess oxygen, secondary phases, and carrier concentration per Cu ions which are produced by Y addition in Bi:2212 system.
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Acknowledgments
The Ac susceptibility measurements are done by Dr/ V.P.S Awana, NPL, India. The author would like to thank Dr/ V.P.S Awana for his cooperation during these measurements. The author also thanks W. Al-Battat, KFU, Saudi Arabia for her co-operation during experimental measurements.
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Sedky, A. A Possible High Critical Temperature and Intergranular Current Density in Bi2Sr2CaY x Cu2 O y Superconductors. J Supercond Nov Magn 29, 1475–1481 (2016). https://doi.org/10.1007/s10948-016-3448-8
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DOI: https://doi.org/10.1007/s10948-016-3448-8