Abstract
We show that features of the dynamical spin susceptibility can unambiguously distinguish between different pairing symmetries of the superconducting state in iron-based superconductors. A magnetic resonance is a feature for the extended -wave pairing symmetry. It is present in the pure superconducting (SC) state but weakens in the mixed SC and magnetically ordered state. We calculate the random-phase approximation correction to the NMR spin-relaxation rate and the Knight shift in the above states and show a good agreement with experimental results. Moreover, we argue that the energy dispersion of the magnetic resonance along the axis observed in neutron scattering experiments is also an indirect evidence supporting the pairing symmetry.
- Received 13 March 2009
DOI:https://doi.org/10.1103/PhysRevB.79.235207
©2009 American Physical Society