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arXiv · cond-mat/0312089

$Fe_{0.5}Cu_{0.5}(Ba_{1-x}Sr_{x})_2YCu_2O_{7+δ}$ ($x$ = 0, 0.5 and 1) superconductors prepared by high pressure synthesis

Z. A. Ren·G. C. Che·Y. M. Ni·C. Dong·H. Chen·S. L. Jia·Z. X. Zhao
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Abstract

In this paper, the $Fe$-containing superconductors $Fe_{0.5}Cu_{0.5}Ba_2YCu_2O_{7+δ}$, $Fe_{0.5}Cu_{0.5}BaSrYCu_2O_{7+δ}$ and $Fe_{0.5}Cu_{0.5}Sr_2YCu_2O_{7+δ}$ were successfully prepared by common solid-state reaction followed with a procedure of high pressure synthesis. The structural change and superconducting properties in $(Fe_xCu_{1-x})BaSrYCu_2O_{7+δ}$ ($x$ = 0 $\sim$ 1.0) systems were also investigated. Annealing experiments indicate that the occurrence of superconductivity in $Fe_{0.5}Cu_{0.5}(Ba_{1-x}Sr_{x})_2YCu_2O_{7+δ}$ ($x$ = 0, 0.5 and 1) systems is mainly induced by the procedure of high pressure synthesis, which causes the increase of oxygen content and the redistribution of $Fe$ atoms between $Cu(1)$ and $Cu(2)$ sites, but not from possible secondary phase of $YBa_2Cu_3O_{7-δ}$, $YBaSrCu_3O_{7-δ}$ or $YSr_2Cu_3O_{7-δ}$ superconductors.

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Z. A. Ren, G. C. Che, Y. M. Ni, C. Dong, H. Chen, S. L. Jia, Z. X. Zhao. 2003-12-03. $Fe_{0.5}Cu_{0.5}(Ba_{1-x}Sr_{x})_2YCu_2O_{7+δ}$ ($x$ = 0, 0.5 and 1) superconductors prepared by high pressure synthesis. https://doi.org/10.1103/physrevb.69.014507

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