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For the Fe-based superconductor Fe{1+y}Te{1-x}S{x}, superconductivity isinduced by annealing treatment in oxygen atmosphere, whereas as-grown samplesdo not show superconductivity. We have investigated the sample-size dependenceof O2-annealing effects in Fe1.01Te0.91S0.09. The annealing conditions arefixed to be 1 atm, 200 C, and 2 hours. We have carried out magneticsusceptibility and specific heat measurements in order to evaluate thesuperconducting volume fraction. We have found that Fe{1+y}Te{1-x}S{x} has anoptimal size for the induction of bulk superconductivity by O2 annealing. Ourresults indicate that O2 annealing is probably effective near the surface ofsamples over a length of a few tens of micro meters.

Size Dependence of Oxygen-annealing Effects on Superconductivity of Fe{1+y}Te{1-x}S{x}