Open AccessA structural model for the CaLaBaCu 3 O 7 superconductor from a detailed XAFS study
Author(s) -
Gurman S. J.,
Amiss J. C.,
Venkatesh S.,
Kumari K.,
Singhal R. K.,
Garg K. B.
Publication year - 1999
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049599000266
Subject(s) - x ray absorption fine structure , superconductivity , materials science , crystallography , physics , chemistry , nuclear engineering , condensed matter physics , spectroscopy , engineering , quantum mechanics
The tetragonal bulk superconductor CaLaBaCu307 is obtained from YBa2Cu307 by the replacement of Y by La and some of the Ba by Ca. Its detailed structure, particularly the cation site occupancy, is uncertain. We have made EXAFS measurements on the edges of all four cations, Ba, Ca, Cu and La to determine the local environment of each and attempt to determine the site occupancies and to construct a possible structure, including local distortions.