Abstract
The paper reports the JC(H, T ) of nano-ZnO doped MgB2 samples calculated from M-H loop measure- ments. 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 behav- ior, which confirms the existence of grain boundary pin- ning. 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 pin- ning 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.
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