Title of article
Activation energies in superconducting high temperature ceramics
Author/Authors
Mehdaoui، نويسنده , , A. and Berling، نويسنده , , D. and Bolmont، نويسنده , , D. and Loegel، نويسنده , , B.، نويسنده ,
Pages
6
From page
132
To page
137
Abstract
Low field a.c. susceptibilities of HgBa2Ca2Cu3O8+δ (Hg-1223) and Bi2Sr2CaCu2O8+δ (Bi-2212) have been studied. The loss peak of χ″, relevant to intergranular pinning, shifts to higher temperatures for increasing frequencies. The results can be fitted with an Arrhenius law, leading to activation energies Ea ≈ 1eV, but the hopping frequencies 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.
Keywords
Superconductivity perovskites , Magnetic measurements , high temperature superconductivity , Meissner effect
Journal title
Astroparticle Physics
Record number
2063407
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