La Trobe

File(s) under permanent embargo

Reason: copyright restrictions from publisher

AC susceptibility and superconducting properties of graphene added YBa2Cu3O7-δ

journal contribution
posted on 31.03.2021, 05:45 by Wei Kong, Ing Kong, MS Hamdan, S Radiman, R Abd-Shukor
© 2018, Springer Science+Business Media, LLC, part of Springer Nature. 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 Tcχ′ between 90 and 93 K. Tcχ′ 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.


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.


Publication Date



Journal of Superconductivity and Novel Magnetism











Rights Statement

The Author reserves all moral rights over the deposited text and must be credited if any re-use occurs. Documents deposited in OPAL are the Open Access versions of outputs published elsewhere. Changes resulting from the publishing process may therefore not be reflected in this document. The final published version may be obtained via the publisher’s DOI. Please note that additional copyright and access restrictions may apply to the published version.