Physics – Condensed Matter – Superconductivity
Scientific paper
2010-09-09
J. Appl. Phys. 109, 013913 (2011)
Physics
Condensed Matter
Superconductivity
5 pages, 1 figure
Scientific paper
10.1063/1.3530579
Vortex penetration affects the stability of a superconducting system and limits the possible application of the system. However, the mathematical description to this phenomenon is currently unavailable. Here I present a mathematical model in which I consider the effects of bulk pinning and internal field repulsive force on vortex hopping. Thereafter, I proposed a series expansion to the activation energy and derived a general formula for describing the time dependence of the vortex penetration process. With these formulas, I can analyze the experimental data and calculate the activation energy of the vortex penetration phenomenon. The results are accurate for the time dependence of the internal field measurements in a $Bi_2Sr_2CaCu_2O_{8+x}$ superconductor.
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