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We report systematic 31P-NMR study on iron (Fe)-based superconductorsSrFe2(As_{1-x}P_{x})2 (Sr122AsP), in which a superconducting (SC) transitiontemperature Tc at x=0.35 increases from Tc=26 K up to 33 K by annealing anas-grown mono-crystalline sample. The present NMR study has unraveled that Tcreaches a highest value of 33 K at x=0.35 around a quantum critical point atwhich antiferromagnetic (AFM) order disappears. When noting that the SCtransition disappears at x=0.6 where the AFM spin fluctuations (SFs) are nolonger present, we remark that the onset and increase of Tc are apparentlyassociated with the emergence and enhancement of AFM-SFs, respectively. In theSC state, the residual density of state (RDOS) at the Fermi energy EF in the SCstate becomes much smaller for the annealed sample than for the as-grown one,suggesting that some inhomogeneity and/or imperfection for the latter increasesRDOS as expected for unconventional SC state with nodal gap. These findings inSr122AsP are consistent with the unconventional s(+-)-wave Cooper pairing statethat is mediated by AFM-SFs. We also discuss other key-ingredients besides theAFM-SFs to increase Tc further.

physical review. b, condensed matter and materials physics

NMR evidence for an intimate relationship between antiferromagnetic spin  fluctuations and extended s-wave superconductivity in mono-crystalline  SrFe2(As_{1-x}P_{x})2