Abstract
The superconductivity in ${\mathrm{Fe}}_{x}{\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Ba}}_{2}\mathrm{Y}{\mathrm{Cu}}_{2}{\mathrm{O}}_{7+y}$ superconductors $(0.00\ensuremath{\leqslant}x\ensuremath{\leqslant}0.70)$ is improved by high-pressure (HP) synthesis. The HP samples have higher oxygen content than the ambient pressure (AM) samples. M\"ossbauer effect studies confirmed that the high-pressure synthesis changes the local structure on the atomic scale. For the HP samples Fe (2) in the $\mathrm{Cu}{\mathrm{O}}_{2}$ planes has highly symmetric pyramidal-oxygen coordination. The tetragonal coordinated Fe (1) in the $\mathrm{Cu}{\mathrm{O}}_{x}$ chains disappears and becomes the one having fivefold and sixfold oxygen coordination after the high-pressure synthesis. This suggests that the increase of oxygen content and the change of local structure are important reasons for the improvement of superconductivity in the HP samples.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.