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Influence of Cu-site substitution on the structure and superconducting properties of the NdBa2Cu3-xMxO7+ delta (M=Fe,Co) and NdBa2Cu3-xMxO7- delta (M=Ni,Zn) systems.

The effect of substitution at the Cu site by the transition elements Fe, Co, Ni, and Zn on the structure and superconducting properties of NdBa 2 Cu 3 O 7 has been investigated. Compared to the YBa 2 Cu 3-x M x O 7+δ (M=Fe, Co, Ni, Zn) system, considerably high solid solubility and drastic T c suppression is achieved in the Nd 1:2:3 system. The maximum solid solubilities achieved for the dopants are x=1.0 for M=Fe and Co and x=0.8 for M=Ni and Zn. An orthorhombic-to-tetragonal (O→T) transition is observed at x=0.08 for M=Fe, Co similar to the case of the M-doped Y 1:2:3 system