LOW-TEMPERATURE MAGNETIC AND MICROWAVE STUDIES OF GD0.95BA2CU3.05O7-DELTA-AGX COMPOSITES

Authors
Citation
Bk. Roul, LOW-TEMPERATURE MAGNETIC AND MICROWAVE STUDIES OF GD0.95BA2CU3.05O7-DELTA-AGX COMPOSITES, Journal of superconductivity, 6(4), 1993, pp. 285-290
Citations number
26
Categorie Soggetti
Physics, Applied","Physics, Condensed Matter
ISSN journal
08961107
Volume
6
Issue
4
Year of publication
1993
Pages
285 - 290
Database
ISI
SICI code
0896-1107(1993)6:4<285:LMAMSO>2.0.ZU;2-P
Abstract
Gd0.95Ba2Cu3.05O7-delta: Ag(x) (x=0.0, 0.02, 0.04, 0.06) ceramic super conducting samples were prepared by a co-precipation technique using o rganic carbonates in the presence of stable polymers. The room-tempera ture normal-state resistivity decreases with Ag addition. However, T(c ) and crystallographic parameters were uneffected. Low-temperature (4. 2 K) magnetic and electrical transport studies in high magnetic fields (5 T) reveal that the addition of Ag into the Gd0.95Ba2Cu3.05O7-delta (GBCO) enhances the magnetic critical current density (J(mc)), volume pinning force (F(p)), flux explusion, and transport critical current density (J(tc)). Microwave-induced dc voltage studies show the reducti on in the total number of weak links between superconducting GBCO grai ns with increase in Ag concentration. The flux creep rate was also inc reased with increase in Ag concentration in GBCO resulting in stronger pinning potential. The increase in J(mc), J(tc), and, hence, F(p) wit h Ag addition in the GBCO suggests the creation of an SNS-type proximi ty junction at the intergrannular region and stronger Josephson curren t paths between the superconducting intergrains, which may be due to t he physical densification and reduction of the total number of weak li nks by Ag addition into the GBCO superconducting system.