Abstract
Mossbauer spectra of 57 Fe in YBa 2 (Cu 1- x Fe x ) 3 O y were studied for the samples keeping the oxygen concentration constant, y =6.87±0.05. Using the results of EXAFS measurement, we find that changes in the Mossbauer pattern with iron concentration can be explained from changes in the oxygen coordination around iron. The number of iron atoms with an octahedral coordination increases rapidly with a change in the crystal structure from orthorhombic to tetragonal. This increase has a close correlation with the decrease in a zero-field cooled magnetization in the superconducting state. These results are consistent with that the tetragonal structure observed by X-ray diffraction is induced by the increase of the number of octahedrally coordinated iron and consists of microdomains with the orthorhombic structure inside the domains.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
