Abstract
Magnetic flux creep in a superconductor with large normal spherical defects isstudied. The known coordinate dependence of the pinning energy allowed usto deduce the current dependence of the effective pinning barrier and theassociated relaxation rate. A nonlinear differential equation governing the fluxcreep was derived. A macroscopic characteristic length determining the scaleof the spatial flux changes was found. Magnetic flux density profiles during thepenetration and relaxation processes were calculated for various mean defect size,R.
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