Effect of Nano ZnO Doping on the Nature of Pinning of MgB2 Superconductors
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Abstract
The paper reports the JC(H,T) of nano-ZnO doped MgB2 samples calculated from M–H loop measurements. Volume pinning forces at different temperatures have been evaluated as a function of the field from the JC–H data. Two different scaling laws, one by Fietz and Webb and another one by M. Eisterer, are used here to analyze the pinning forces. All samples show the scaling behavior, which confirms the existence of grain boundary pinning. The XRD and R–T data show the substitution of Zn at Mg sites. The anisotropy in the sample is found to decrease with the doping of the nano-ZnO. The improvement in the JC(H,T) of the sample with the nano-ZnO doping is due to decrease in the anisotropy and increase in the volume pinning forces. The 2 % nano-ZnO doping is found to be the optimal value in order to achieve the highest JC(H,T) in these samples.
Keywords
MgB2 Nano-zinc oxide Critical current Pinning force Scaling and anisotropyNotes
Acknowledgements
This work was supported by NPST program by King Saud University, Riyadh, under the project number 08-ADV397-2.
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