Abstract

Although a nodeless superconducting gap has been observed on the large Fermi pockets around the zone corner in K${}_{x}$Fe${}_{2\ensuremath{-}y}$Se${}_{2}$, whether its pairing symmetry is $s$ wave or nodeless $d$ wave is still under intense debate. Here we report an isotropic superconducting gap distribution on the small electron Fermi pocket around the $Z$ point in K${}_{x}$Fe${}_{2\ensuremath{-}y}$Se${}_{2}$, which favors the $s$-wave pairing symmetry.

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