Time evolution of copper defects in the mixed phase La0.5Gd0.5Ba2Cu3Oy

Authors
Guskos, N Likodimos, V Calamiotou, M Gantis, A Nabialek, A Szymczak, H Wabia, M
Citation
N. Guskos et al., Time evolution of copper defects in the mixed phase La0.5Gd0.5Ba2Cu3Oy, RADIAT EFF, 151(1-4), 1999, pp. 151-157
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
RADIATION EFFECTS AND DEFECTS IN SOLIDS
ISSN journal
10420150 → ACNP
Volume
151
Issue
1-4
Year of publication
1999
Pages
151 - 157
Database
ISI
SICI code
1042-0150(1999)151:1-4<151:TEOCDI>2.0.ZU;2-J
Abstract
XRD, magnetic and EPR studies of the mixed phase La0.5Gd0.5Ba2Cu3Oy high-T- c superconductor after prolonged (one year) "aging" at room temperature are reported. Within this time period a pronounced change of the superconducti ng behavior and the homogeneity of the diamagnetic shielding signal accompa nied by substantial structural changes, reduction of the impurity phase BaC uO2+x and increase of the EPR spectrum's intensity of Cu2+ magnetic defects is detected. The "aging" effects are related to strain-relaxation taking p lace during room temperature annealing that induces the formation of Cu2+ d efect centers.