ACTIVATION-ENERGIES IN SUPERCONDUCTING HIGH-TEMPERATURE CERAMICS

Authors
MEHDAOUI A BERLING D BOLMONT D LOEGEL B
Citation
A. Mehdaoui et al., ACTIVATION-ENERGIES IN SUPERCONDUCTING HIGH-TEMPERATURE CERAMICS, Materials science & engineering. B, Solid-state materials for advanced technology, 34(2-3), 1995, pp. 132-137
Citations number
15
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Materials science & engineering. B, Solid-state materials for advanced technology → ACNP
ISSN journal
09215107
Volume
34
Issue
2-3
Year of publication
1995
Pages
132 - 137
Database
ISI
SICI code
0921-5107(1995)34:2-3<132:AISHC>2.0.ZU;2-5
Abstract
Low field a.c. susceptibilities of HgBa2Ca2Cu3O8+delta (Hg-1223) and B i2Sr2CaCu2O8+delta (Bi-2212) have been studied. The loss peak of chi ' ', relevant to intergranular pinning, shifts to higher temperatures fo r increasing frequencies. The results can be fitted with an Arrhenius law, leading to activation energies E(a) approximate to 1 eV, but the hopping frequencies f(0) are not realistic. More realistic values can be obtained by introducing a Fulcher law or a power law which is also characteristic of strongly interacting systems.