ABSTRACT
This review presents summary of NMR experiments performed
on various iron-based superconductors. The authors introduce
NMR experiments which reveal magnetic properties in the normal
and superconducting states. In the superconducting state, NMR
measurements clarified that iron-based superconductors form spin-
singlet pairing, although the orbital symmetry is controversial in
some cases. From the comparison of the NMR results in various iron-
based superconductors, the relationship between superconductivity
and magnetic fluctuations probed with NMR is discussed.
