The field-amplitude and frequency dependent complex ac susceptibility of a well sintered disk has been measured at , which shows that its intra- and intergranular critical-current densities are determined by the collective flux creep inside the grains and the maximum Josephson currents across the grain boundaries, respectively. While the former is widely recognized, the latter contrasts to a popular belief of a mechanism of Josephson-vortex pinning and creep.
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Research Article| August 14 2006
ac susceptibility and critical-current densities in sintered superconductors
D.-X. Chen, E. Pardo, A. Sanchez, E. Bartolomé; ac susceptibility and critical-current densities in sintered superconductors. Appl. Phys. Lett. 14 August 2006; 89 (7): 072501. https://doi.org/10.1063/1.2336596
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