Selective Mott physics as a key to iron superconductors.
Phys Rev Lett
; 112(17): 177001, 2014 May 02.
Article
in En
| MEDLINE
| ID: mdl-24836267
ABSTRACT
We show that electron- and hole-doped BaFe(2)As(2) 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.
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Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2014
Type:
Article
Affiliation country:
France