Abstract
The effect of graphene (G) addition on YBa2Cu3O7−δ(G)x (x = 0 − 0.03 wt%) has been studied using the X-ray diffraction method, scanning electron microscopy, electrical resistance versus temperature, transport critical current density Jc, and AC susceptibility measurements. XRD patterns showed single-phase YBa2Cu3O7−δ (YBCO) for all samples. SEM micrographs showed filling of the voids between YBa2Cu3O7−δ grains as graphene was added. The temperature-dependent electrical resistance curves showed metallic normal state behavior and onset transition temperature Tconset between 90 and 92 K for all samples. AC susceptibility measurement showed transition temperature \(T_{\mathrm {c} \chi ^{\prime }}\) between 90 and 93 K. \(T_{\mathrm {c} \chi ^{\prime }}\) was maintained or improved slightly as graphene was added. The x = 0.001 wt% showed the highest Jc, i.e., 2750 A cm−2 at 77 K and 5570 mA cm−2 at 30 K which was 13 and 40 times higher than that of the non-added YBCO, respectively. The peak temperature Tp of the imaginary part of the susceptibility χ″ was around 78–82 K for all samples indicating grain coupling was not weakened as graphene was added.
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This research was supported by the Ministry of Higher Education of Malaysia under grant nos. FRGS/2/2013/SG02/IUKL/02/1 and FRGS/1/2017/STG02/UKM/01/1.
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Wei, K., Ing, K., Hamdan, M.S. et al. AC Susceptibility and Superconducting Properties of Graphene Added YBa2Cu3O7−d. J Supercond Nov Magn 31, 2699–2703 (2018). https://doi.org/10.1007/s10948-017-4536-0
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DOI: https://doi.org/10.1007/s10948-017-4536-0