Synergy between Hund-driven correlations and boson-mediated Superconductivity
arXiv:1908.10901 · doi:10.1103/PhysRevLett.125.177001
Abstract
Multiorbital systems such as the iron-based superconductors provide a new avenue to attack the longstanding 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 crucial role of the redistribution of spectral weight in 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.
Revised version contains additional calculations which include the effect of the energy cut-off in the BCS analysis and prove the generality of our conclusions
References in corpus (21)
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- Strong electronic correlations from Hund's coupling
- Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
- Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
- Orbital-Selective Mott transition out of band degeneracy lifting
- Hund's coupling key role in multi-orbital correlations
- Modeling the Unconventional Superconducting Properties of Expanded AC Fullerides
- U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
- Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
- Hundness versus Mottness in a three-band Hubbard-Hund model: On the origin of strong correlations in Hund metals
- Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
- Orbital differentiation and the role of orbital ordering in the magnetic state of Fe superconductors
- Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
- 3D superconducting gap in FeSe from ARPES
- Charge disproportionation, mixed valence, and Janus effect in multiorbital systems: A tale of two insulators
- Scaling of the superconducting gap with orbital character in FeSe
- Orbital-selective superconductivity in the nematic phase of FeSe
- Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
- Smooth self-energy in the exact-diagonalization-based dynamical mean-field theory: Intermediate-representation filtering approach
- Strongly Correlated Superconductivity rising from a Pseudo-gap Metal
- Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
Cited by in corpus (13)
- Ironing out the details of unconventional superconductivity
- Interaction-resistant metals in multicomponent Fermi systems
- : A site-differentiated Hund metal
- Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties
- Orbital-dependent self-energy effects and consequences for the superconducting gap structure in multi-orbital correlated electron systems
- Switching between Mott-Hubbard and Hund physics in moiré quantum simulators
- Nematic spectral signatures of the Hund's metal
- Frozen spin ratio and the detection of Hund correlations
- Intertwined superconductivity and orbital selectivity in a three-orbital Hubbard model for the iron pnictides
- Finite-momentum and field-induced pairings in orbital-singlet spin-triplet superconductors
- Triplet pairing, orbital selectivity and correlations in Iron-based superconductors
- Superconductor-Insulator transition in a two-orbital attractive Hubbard model with Hund's exchange
- Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2