Review of nuclear magnetic resonance studies on iron-based superconductors

The newly discovered iron-based superconductors have triggered renewed enormous research interest in the condensed matter physics community. Nuclear magnetic resonance (NMR) is a low-energy local probe for studying strongly correlated electrons, and particularly important for high-T C superconductors. In this paper, we review NMR studies on the structural transition, antiferromagnetic order, spin fluctuations, and superconducting properties of several iron-based high-T C superconductors, including LaFeAsO1-xF x , LaFeAsO1-x , BaFe2As2 , Ba1-xKxFe2As2 , Ca0.23Na0.67Fe2As2 , BaFe2 (As1-xPx )2 , Ba(Fe1-xRux )2As2 , Ba(Fe1-x Cox )2 As2 , Li1+xFeAs, LiFe1-xCoxAs, NaFeAs, NaFe1-xCoxAs, KyFe2-xSe2 , and (Tl,Rb)yFe2-x Se2.