Luca de’ Medici, CNRS ESPCI

Jeudi 23 Mai 2013, 14h
Amphi Holweck, Esc C, 1ème etage

Selective Mottness as a key to iron superconductors

Luca de’ Medici
CNRS – ESPCI ParisTech

The phase diagram of the high-Tc cuprates is dominated by the Mott insulating phase of the parent compounds. As we approach it from large doping, a standard Fermi-liquid gradually turns into a bad non-Fermi liquid metal, a process which culminates in the pseudogap regime, in which the antinodal region in momentum space acquires a gap before reaching a fully gapped Mott state.
I will show that experiments for electron- and hole-doped BaFe2As2 support an analogous scenario. The doping evolution is dominated by the influence of a Mott insulator that would be realized for half-filled conduction bands, while the stochiometric compound does not play a special role. Weakly and strongly correlated conduction electrons coexist in much of the phase diagram, a differentiation which increases with hole doping. We identify the reason for this selective Mottness in a strong Hund’s coupling, which decouples the different orbitals. Each orbital then behaves as a single band Hubbard model, where the correlation degree only depends on how doped is each orbital from half-filling. Our scenario reconciles contrasting evidences on the electronic correlation strength and establishes a deep connection with the cuprates.

L. de’ Medici, G. Giovannetti and M. Capone, ArXiv:1212.3966


Haut de page



À lire aussi...

Pouyan Ghaemi, University of Illinois at Urbana Champaign

Jeudi 21 Juin, 16hAmphi Howleck, Esc C, 1ème etage Graphene as the classical playground of quantum excitations Pouyan GhaemiUniversity of Illinois (…) 

> Lire la suite...

Bernard Plaçais, Laboratoire Pierre Aigrain

Jeudi 13 Mars 2014, 14hAmphi Holweck, Esc C, 1ème etage Dynamique et relaxation des Fermions de Dirac du Graphène Bernard Plaçais Laboratoire (…) 

> Lire la suite...