Comparative studies of 2212 type superconductors in the Tl-Hg-Ba-Sr-Ca-Cu-O system.

Authors
Valldor, M Bryntse, I
Citation
M. Valldor et I. Bryntse, Comparative studies of 2212 type superconductors in the Tl-Hg-Ba-Sr-Ca-Cu-O system., J L TEMP PH, 117(3-4), 1999, pp. 867-871
Citations number
7
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF LOW TEMPERATURE PHYSICS
ISSN journal
00222291 → ACNP
Volume
117
Issue
3-4
Year of publication
1999
Pages
867 - 871
Database
ISI
SICI code
0022-2291(199911)117:3-4<867:CSO2TS>2.0.ZU;2-X
Abstract
Superconductors in the Tl1.3Hg0.7Ba2-xSrx+yCa1-yCu2O7+delta system (sp.gr.I 4/mmm) were prepared through standard powder reaction in closed vessels. Th e transition temperatures (T-c) for the different stoichiometries spanned f rom 100 to 45 K. Both cell parameters (a and c) increased in proportion to T-c. These changes were mainly related to the distribution of size differin g atoms at two sites in the structure and not to the oxidation state of Cu. The presence of Ba seemed favorable when comparing composition and T-c.