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Irreversibility line and low-field grain-boundary pinning in electron-doped superconducting thin films | | S. Sergeenkov
; A.J.C. Lanfredi
; F.M. Araujo-Moreira
; 10.1063/1.2402969
; | | Date: |
19 Jan 2007 | | Journal: | J. Appl. Phys. 100, 123903 (2006) | | Subject: | Superconductivity; Materials Science | | Abstract: | 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. | | Source: | arXiv, cond-mat/0701474 | | Services: | Forum | Review | PDF | Favorites | |
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