Abstract
ac magnetic susceptibilities of electron-doped Pr1.85Ce0.15CuO4 (PCCO) and Sm1.85Ce0.15CuO4 (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), Tirr≡Tp(H), defined as the intergrain-loss peak temperature in the imaginary part of the susceptibility and obeying the law 1−Tp∕TC∝Hq, have been found. Namely, more homogeneous PCCO films (with a grain size of the order of 2μm) are best-fitted with q=2∕3 while less homogeneous SCCO films (with a grain size of the order of 500nm) follow the IL law with q=1. 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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