A simple model is developed which describes the reduction of the mean free path of conduction electrons in metals near a grain boundary. This leads to a decrease of the self-energy of flux lines in a layer which is considerably thicker than the perturbed zone of the boundary itself. The model yields pinning forces which agree, within an order of magnitude, with recent measurements on niobium bicrystals, and with observed values of grain boundary pinning in Nb3Sn.
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Work supported by FAPESP, proc. no. 78/1230, and by the Niobium Project of FTI, Lorena SP, Brazil.
On sabbatical leave from Instituto de Física da Universidade Estadual de Campinas (UNICAMP).
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Zerweck, G. On pinning of superconducting flux lines by grain boundaries. J Low Temp Phys 42, 1–9 (1981). https://doi.org/10.1007/BF00116692
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DOI: https://doi.org/10.1007/BF00116692