We show that electron- and hole-doped BaFe2As2 are strongly influenced by a Mott insulator that would be realized for half-filled conduction bands. Experiments show that weakly and strongly correlated conduction electrons coexist in much of the phase diagram, a differentiation which increases with hole doping. This selective Mottness is caused by the Hund's coupling effect of decoupling the charge excitations in different orbitals. Each orbital then behaves as a single-band doped Mott insulator, where the correlation degree mainly depends on how doped is each orbital from half filling. Our scenario reconciles contrasting evidences on the electronic correlation strength, implies a strong asymmetry between hole and electron doping, and establishes a deep connection with the cuprates.
Titolo: | Selective Mott Physics as a Key to Iron Superconductors |
Autori: | de' Medici, L.; Giovannetti, G.; Capone, M. |
Rivista: | |
Data di pubblicazione: | 2014 |
Volume: | 112 |
Fascicolo: | 17 |
Pagina iniziale: | 1 |
Pagina finale: | 5 |
Numero di Articolo: | 177001 |
Digital Object Identifier (DOI): | 10.1103/PhysRevLett.112.177001 |
URL: | https://arxiv.org/abs/1212.3966 |
Appare nelle tipologie: | 1.1 Journal article |