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We report results of 75As nuclear magnetic resonance (NMR) experiments on aself-flux grown high-quality single crystal of SrFe2As2. The NMR spectraclearly show sharp first-order antiferromagnetic (AF) and structuraltransitions occurring simultaneously. The behavior in the vicinity of thetransition is compared with our previous study on BaFe2As2. No significantdifference was observed in the temperature dependence of the static quantitiessuch as the AF splitting and electric quadrupole splitting. However, theresults of the NMR relaxation rate revealed difference in the dynamical spinfluctuations. The stripe-type AF fluctuations in the paramagnetic state appearto be more anisotropic in BaFe2As2 than in SrFe2As2.

Antiferromagnetism of SrFe2As2 studied by Single-Crystal 75As-NMR