Synthesis and Superconductivity in(Ru0.8Nb0.2)Sr2(Gd1.5-xNdxCe0.5)Cu2Oz System

초록

Polycrystalline samples of (Ru0.8Nb0.2)Sr2(Gd1.5-xNdxCe0.5)Cu2Oz ( 0 ≤ x ≤1.25) have been synthesized by a solid-state reaction route. The X-ray diffraction data revealed that the Nd solubility limit can be placed between x = 0.5 and x = 0.75. The superconducting transition temperature decreased with increasing Nd content, confirming that Nd entered the lattice. Room-temperature thermoelectric power measurements showed that all the samples are in the underdoped state and the partial substitution of Nd for Gd resulted in a decrease in the carrier density on the superconducting layers.

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