Miscibility of Au and Cu in superconducting YBa2(Cu1-xAux)(3)O7-delta for 0 < x < 0.15

Citation
Ct. Bird et al., Miscibility of Au and Cu in superconducting YBa2(Cu1-xAux)(3)O7-delta for 0 < x < 0.15, PHYSICA C, 324(3-4), 1999, pp. 133-136
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
09214534 → ACNP
Volume
324
Issue
3-4
Year of publication
1999
Pages
133 - 136
Database
ISI
SICI code
0921-4534(19991101)324:3-4<133:MOAACI>2.0.ZU;2-U
Abstract
Au has been successfully incorporated into the 123 superconducting oxide YB a2(Cu1-xAux)(3)O7-delta with up to 15% of the Cu sites occupied by Au atoms (n = 0.15). Earlier work found an apparent solubility limit of only 3.3%. Higher Au concentrations in these sintered ceramics were readily obtained b y substituting Au2O3 for the corresponding amount of CuO in the starting po wders, instead of adding metallic Au to stoichiometric 123 mixtures. Au is the only known dopant which raises the superconducting transition temperatu re of the 123 copper oxide, by 1.5 K for x approximate to 0.03. Increasing Au concentrations cause a gradual drop in T-c,. More than a "doped" copper oxide, at these concentrations YBa2(Cu1-xAux)(3)O7-delta is a novel, contin uous Cu-Au oxide system. (C) 1999 Elsevier Science B.V. All rights reserved .