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Identifying the symmetry of the wave function describing the Cooper pairs ispivotal in understanding the origin of high-temperature superconductivity iniron-based superconductors. Despite nearly a decade of intense investigation,the answer to this question remains elusive. Here we use the muon spinrotation/relaxation (muSR) technique to investigate the underlying symmetry ofthe pairing state of the FeSe superconductor, the basic building block of alliron-chalcogenide superconductors. Contrary to earlier muSR studies on powdersand crystals, we show that while the superconducting gap is most probablyanisotropic but nodeless along the crystallographic c-axis, it is nodal in theab-plane, as indicated by the linear increase of the superfluid density at lowtemperature. We further show that the superconducting properties of FeSedisplay a less pronounced anisotropy than expected.

Evidence of nodal gap structure in the basal plane of the FeSe superconductor