Crystal structures, magnetic and superconducting properties of the RuSr_2NdCu_2O_x and RuSr_2GdCu_2O_y compounds

Details Crystal structures, magnetic and superconducting properties of the RuSr_2NdCu_2O_x and RuSr_2GdCu_2O_y compounds Crystal structures, magnetic and superconducting properties of the RuSr_2NdCu_2O_x and RuSr_2GdCu_2O_y compounds

2001-10-22

arxiv.org/abs/cond-mat/0110482v1

Physics

Condensed Matter

Superconductivity

7 pages and 3 figures

Scientific paper

We report the magnetization and the susceptibility measurements of the RuSr_2GdCu_2O_y and RuSr_2NdCu_2O_x perovskite materials. We find that RuSr_2GdCu_2O_y compound exhibits a magnetic transition at Tn=135 K followed by a superconducting one with an onset Tc=35 K. Samples of RuSr_2NdCu_2O_x material have shown neither superconductivity nor magnetic transition. XRD measurements show that in RuSr_2NdCu_2O_x the Nd ions tend to substitute to Sr ions in very high percentages. The relevance of this phenomenon on the absence of superconductivity in RuSr_2NdCu_2O_x is discussed.

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