CATION SUBSTITUTION AND DEOXYGENATION EFFECT ON SUPERCONDUCTIVITY OF TL-SR1212 CUPRATE

Authors
OHSHIMA E KIKUCHI M NAGOSHI M SYONO Y
Citation
E. Ohshima et al., CATION SUBSTITUTION AND DEOXYGENATION EFFECT ON SUPERCONDUCTIVITY OF TL-SR1212 CUPRATE, Physica. C, Superconductivity, 263(1-4), 1996, pp. 189-192
Citations number
7
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
263
Issue
1-4
Year of publication
1996
Pages
189 - 192
Database
ISI
SICI code
0921-4534(1996)263:1-4<189:CSADEO>2.0.ZU;2-F
Abstract
The relation between the superconductivity and the Cu valence of TlSr2 Ca1-xYxCu2Oy is investigated. The facts that the Cu valence of the opt imum-doped specimen, if Tl3+ is assumed, is rather low and that even t he specimen with a Cu valence as low as 2.02 shows superconductivity s uggest a small charge transfer from the TlO-layer to the CuO2-sheets. The binding energy shift of the Tl 4f core level measured by XPS lends support to the slight decrease in Tl valence.