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L. Fanfarillo, A. Valli, M. Capone:
"Synergy between Hund-driven correlations and boson-mediated Superconductivity";
Physical Review Letters, 125 (2020), 177001-1 - 177001-6.

Multiorbital systems such as the iron-based superconductors provide a new avenue to attack the long-standing problem of superconductivity in strongly correlated systems. In this work we study the superconductivity driven by a generic bosonic mechanism in a multiorbital model including the full dynamical electronic correlations induced by the Hubbard U and the Hund´s coupling. We show that superconductivity survives much more in a Hund´s metal than in an ordinary correlated metal with the same degree of correlation. The redistribution of spectral weight characteristic of the Hund´s metal reflects also in the enhancement of the orbital-selective character of the superconducting gaps, in agreement with experiments in iron-based superconductors.

http://dx.doi.org/10.1103/PhysRevLett.125.177001