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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© 2006 American Institute of Physics.
2006
American Institute of Physics
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