Quantum dynamical screening of the local magnetic moments in the different families of Fe-based superconductors

The formation of localized magnetic moments and their dynamical screening represents one of the crucial ingredients of the physics of correlated metals. Their theoretical treatment is, in fact, crucial to correctly predict the spectroscopic observations in several important classes of correlated materials [1,2]. In this talk, we investigate [3] the local spin dynamics in different families of Fe-based superconductors by means of realistic dynamical mean-field theory calculations: We compute the dynamic magnetic correlations on the Fe sites both in real frequency and in real time domain. The former allows for a direct comparison with inelastic neutron spectroscopy, explaining the trends observed in the experiments on the different families of Fe-based superconductors. The latter allows to identify the characteristic time scales of the spin dynamics in these materials, which is useful for the interpretation of the discrepancies between different experimental probes, and, in perspective, for the analysis of future non-equilibrium experiments.


[1] A. Toschi, et al., PRB 86, 064411 (2012).
[2] A. Hausoel, et al. Nat. Comm. 8, 16062 (2017).
[3] C. Watzenböck, M. Edelmann, D. Springer, A. Hausoel, G. Sangiovanni and A. Toschi, in preparation.