Irreversibility line and low-field grain-boundary pinning in electron-doped superconducting thin films

Details Irreversibility line and low-field grain-boundary pinning in electron-doped superconducting thin films Irreversibility line and low-field grain-boundary pinning in electron-doped superconducting thin films

2007-01-19

arxiv.org/abs/cond-mat/0701474v1

J. Appl. Phys. 100, 123903 (2006)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1063/1.2402969

AC magnetic susceptibilities of electron-doped Pr_{1.85}Ce_{0.15}CuO_4 (PCCO) and Sm_{1.85}Ce_{0.15}CuO_4 (SCCO) granular thin films have been measured as a function of temperature and magnetic-field strength. Depending on the level of homogeneity of our films, two different types of the irreversibility line (IL) defined as the intergrain-loss peak temperature in the imaginary part of susceptibility have been found. The obtained results are described via the critical-state model taking into account the low-field grain-boundary pinning. The extracted pinning-force densities in more granular SCCO films turn out to be four times larger than their counterparts in less granular PCCO films.

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