$Fe_{0.5}Cu_{0.5}(Ba_{1-x}Sr_{x})_2YCu_2O_{7+δ}$ ($x$ = 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

doi:10.1103/PhysRevB.69.014507

paper

$F e_{0.5} C u_{0.5} (B a_{1 - x} S r_{x})_{2} Y C u_{2} O_{7 + δ}$ ( $x$ = 0, 0.5 and 1) superconductors prepared by high pressure synthesis

arXiv:cond-mat/0312089 · doi:10.1103/PhysRevB.69.014507

Abstract

In this paper, the $F e$ -containing superconductors $F e_{0.5} C u_{0.5} B a_{2} Y C u_{2} O_{7 + δ}$ , $F e_{0.5} C u_{0.5} B a S r Y C u_{2} O_{7 + δ}$ and $F e_{0.5} C u_{0.5} S r_{2} Y C u_{2} O_{7 + δ}$ were successfully prepared by common solid-state reaction followed with a procedure of high pressure synthesis. The structural change and superconducting properties in $(F e_{x} C u_{1 - x}) B a S r Y C u_{2} O_{7 + δ}$ ( $x$ = 0 $\sim$ 1.0) systems were also investigated. Annealing experiments indicate that the occurrence of superconductivity in $F e_{0.5} C u_{0.5} (B a_{1 - x} S r_{x})_{2} Y C u_{2} O_{7 + δ}$ ( $x$ = 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 $F e$ atoms between $C u (1)$ and $C u (2)$ sites, but not from possible secondary phase of $Y B a_{2} C u_{3} O_{7 - δ}$ , $Y B a S r C u_{3} O_{7 - δ}$ or $Y S r_{2} C u_{3} O_{7 - δ}$ superconductors.

5 pages, 9 figures, accepted by Physical Review B

Fe0.5​Cu0.5​(Ba1−x​Srx​)2​YCu2​O7+δ​ (x = 0, 0.5 and 1) superconductors prepared by high pressure synthesis

Abstract

$F e_{0.5} C u_{0.5} (B a_{1 - x} S r_{x})_{2} Y C u_{2} O_{7 + δ}$ ( $x$ = 0, 0.5 and 1) superconductors prepared by high pressure synthesis