FIG. 3. Color online Temperature dependence of the 75As NMR: a spin part of Knight shift, b T1T −1, and c Korringa factor above Tc, measured for LiFeAs green circles and SrFe2As2 red squares . Horizontal dashed lines indicate expected values for in case of noninteracting electrons for on-site 0 and transferred coupling 0 see text for details . The inset to a shows the behavior of Ks below Tc=15 K vertical dashed line at 9.4 T.
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