The critical current density as a function of applied field for both undoped and malic acid doped samples. Lines were calculated with the percolation model.
(a) The -axis lattice parameter, (b) the transition temperature, (c) the amount of carbon substitution, (d) the estimated lattice strain, (e) the MgO weight percentage, (f) the normalized resistivity, (g) the AF, and (h) the estimated upper critical field at various sintering temperatures. All lines are only guides to the eyes.
(a) The transition temperature and the residual resistance ratio (inset) as a function of estimated lattice strain. Lines are only guides to the eyes. (b) The transition temperature as a function of the normalized resistivity and the residual resistance ratio (inset). Solid lines are calculated with and ·, respectively.
The fitting parameters used for the calculation from the percolation model, Eq. (2), of the critical current density shown in Fig. 1.
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