Superconductivity and CuK-XANES of (Hg,Re)Sr2CuO4+delta

Authors
Balamurugan, S Gopalakrishnan, IK Prakash, O Padalia, BD Yakhmi, JV Selvam, P
Citation
S. Balamurugan et al., Superconductivity and CuK-XANES of (Hg,Re)Sr2CuO4+delta, MOD PHY L B, 15(9-10), 2001, pp. 261-268
Citations number
46
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
MODERN PHYSICS LETTERS B
ISSN journal
02179849 → ACNP
Volume
15
Issue
9-10
Year of publication
2001
Pages
261 - 268
Database
ISI
SICI code
0217-9849(20010430)15:9-10<261:SACO(>2.0.ZU;2-Z
Abstract
The 1201-type nominal (Hg(0.9)Reo(0.1))Sr2CuO4+delta samples, synthesized a t similar to 920 degreesC in partial vacuum, show, from temperature depende nt dc-magnetization, T-c(onset) similar to 54 K. The CuK-edge features obta ined from X-ray absorption measurements on the sample show predominantly Cu 2+ state and a weak but distinct Cu1+ signature due to superconducting 1201 phase (after taking due account of impurity Sr2CuO3, and SrCuO2 phases). T he presence of Cu1+ signature in SC samples is consistent with our earlier observations of Cu1+ in Ba-free superconducting (Hg,Cr)-1201 and (Hg,Mo)-12 01 materials.