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- W2015839807 abstract "The spin resonance observed in the inelastic neutron scattering data on Fe-based superconductors has played a prominent role in the quest for determining the symmetry of the order parameter in these compounds. Most theoretical studies of the resonance employ an RPA-type approach in the particle-hole channel and associate the resonance in the spin susceptibility $chi_S (mathbf{q}, omega)$ at momentum ${bf Q} = (pi,pi)$ with the spin-exciton of an $s^{+-}$ superconductor, pulled below $2Delta$ by residual attraction associated with the sign change of the gap between Fermi points connected by ${bf Q}$. Here we explore the effect of fluctuations in the particle-particle channel on the spin resonance. Particle-particle and particle-hole channels are coupled in a superconductor and to what extent the spin resonance can be viewed as a particle-hole exciton needs to be addressed. In the case of purely repulsive interactions we find that the particle-particle channel at total momentum ${bf Q}$ (the $pi $channel) contributes little to the resonance. However, if the interband density-density interaction is attractive and the $pi-$resonance is possible on its own, along with the spin-exciton, we find a much stronger shift of the resonance frequency from the position of the would-be spin-exciton resonance. We also show that the expected double-peak structure in this situation does not appear because of the strong coupling between particle-hole and particle-particle channels, and $mathrm{Im} chi_S ({bf Q}, omega)$ displays only a single peak." @default.
- W2015839807 created "2016-06-24" @default.
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- W2015839807 date "2014-09-16" @default.
- W2015839807 modified "2023-09-26" @default.
- W2015839807 title "Effect of pairing fluctuations on the spin resonance in Fe-based superconductors" @default.
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- W2015839807 doi "https://doi.org/10.1103/physrevb.90.104509" @default.
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