Temperature Dependence of a Width of = Region in 5 wt.\% (Fe, Ti) Paticle-Doped MgB2 Superconductor
Abstract
A temperature dependence of a width of = region has been studied for 5 wt.\% (Fe, Ti) particle-doped MgB2 superconductor. The result revealed that widths of the region are linear along temperature. Here we show the meaning of the result and details of the calculation. In previous report, we represented a theory that a width of = region is related with upper critical field of the superconductor, which is that pinned fluxes at volume defect are picked out and move in = region when a distance between them is the same as that of upper critical field. Thus, we inspected the relationship between a width of the region and upper critical field along temperature. The theory would gain another justification if temperature dependence of a width of the region is proportional to that of upper critical field. We discussed several topics for = region of 5 wt.\% (Fe, Ti) particle-doped MgB2 superconductor, which are Fe of (Fe, Ti) particle, Bean model, volume dependence of the region, etc..
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