Structure and superconducting properties of chemically oxidized La2CuO4+y under hydrothermal conditions

Authors
Lan, YC Chen, XL Cao, YG Huang, JK Che, GC Liu, GD Xu, YP Xu, T Li, JY
Citation
Yc. Lan et al., Structure and superconducting properties of chemically oxidized La2CuO4+y under hydrothermal conditions, PHYSICA C, 336(1-2), 2000, pp. 151-156
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
09214534 → ACNP
Volume
336
Issue
1-2
Year of publication
2000
Pages
151 - 156
Database
ISI
SICI code
0921-4534(20000701)336:1-2<151:SASPOC>2.0.ZU;2-6
Abstract
Stoichiometric La2CuO4 was chemically oxidized under hydrothermal condition s in KMnO4 solutions above 100 degrees C. The structure and superconducting properties of the oxidized La2CuO4+y were studied by X-ray powder diffract ion and magnetic susceptibility measurements. A large orthorhombic distorti on was observed for the oxidized samples from X-ray diffraction. The oxidiz ed La2CuO4+y shows a high superconducting transition up to 42 K. Chemical o xidation under hydrothermal conditions is effective in inserting oxygen int o La2CuO4 because of equilibrium and of higher oxidation temperatures. (C) 2000 Elsevier Science B.V. All rights reserved.