Role of interactions in the energy of the spin resonance peak in Fe-based superconductors

Abstract

We consider the spin response within the five-orbital model for iron-based superconductors and study two cases: equal and unequal gaps in different bands. In the first case, the spin resonance peak in the superconducting state appears below the characteristic energy scale determined by the gap magnitude, $2{\Delta }_L$. In the second case, the energy scale corresponds to the sum of smaller and larger gap magnitudes, ${\Delta }_L+{\Delta }_S$. Increasing the values of the Hubbard interaction and the Hund's exchange, we observe a shift of the spin resonance energy to lower frequencies.

arXiv comment4 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1608.00245

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Cited by in corpus (1)

• Electron correlation effects in paramagnetic cobalt