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We studied a method of measuring upper critical field (H$_{c2}$) of asuperconductor based on the width of $\Delta$H = $\Delta$B region, whichappears in the superconductor that volume defects are many and dominant. Herewe present the basic concept and details of the method. Although H$_{c2}$ of asuperconductor is fixed according to kind of the superconductor, it isdifficult to measure H$_{c2}$ experimentally, and the results are differentdepending on the experimental conditions. H$_{c2}$ was calculated from thetheory that pinned fluxes at volume defects are picked out and move into aninside of the superconductor when their arrangement is the same as that ofH$_{c2}$ state of the superconductor. H$_{c2}$ of MgB$_2$ obtained by themethod was 65.4 Tesla at 0 K. The reason that H$_{c2}$ obtained by the methodis closer to ultimate H$_{c2}$ is based on that$\Delta$F$_{pinning}$/$\Delta$F$_{pickout}$ is more than 4 when pinned fluxesat volume defects of 163 nm radius are picked out. The method will help to findthe ultimate H$_{c2}$ of volume defect-dominating superconductors.

Upper Critical Field Based on the Width of $\Delta$H = $\Delta$B region in a Superconductor