Abstract
The trapped magnetic flux characteristics of a Gd-system bulkhigh-Tc superconductor (HTS) near the so-called percolation transition temperaturewas investigated experimentally. The percolation transition temperaturewas directly determined from the temperature dependence of theE–J characteristics with a bar-shaped HTS. Next, the disc-shaped bulk HTS sample wasmagnetized by means of a field-cooling process, and then the decay of the trapped magneticflux density was monitored for 30 min after the exciting current of the electromagnet wascut off. It was shown that the decay rate of trapped magnetic flux changed considerablyaround the percolation transition temperature. Furthermore, the trapped flux showedstepwise decay, and these phenomena could explain the percolation mechanism of thedepinning process. From our study, the percolation temperature may be utilized for thelimit parameter in order to design application systems with a practical sized bulk HTS.
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