Nb Substitution Effects on Superconducting Properties of Ru_1−xNb_xSr₂Eu_1.4Ce_0.6Cu₂O_10−δ

Figure 4

First derivative of the resistivity as a function of temperature for Ru_1−xNb_x-1222 (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0). Also it is shown the deconvolution of the derivative curves into two Gaussian peaks corresponding to temperatures 𝑇_𝑐1 and 𝑇_𝑐2.