Role of Interactions in the Energy of the Spin Resonance Peak in Fe-Based Superconductors. Increasing the values of the Hubbard interaction and the Hund’
s exchange, we observe a shift of the spin
Spin resonance peak in Fe-based superconductors with unequal gaps, the indirect gap is either Δ˜=ΔL+ΔS or Δ˜=2ΔL. In the
s++ state, spin excitations below Δ˜ are absent unless