We show that electron correlations lead to a bad metallic state in chalcogenides FeSe and FeTe despite the intermediate value of the Hubbard repulsion U and Hund's rule coupling J. The evolution of the quasiparticle weight Z as a function of the interaction terms reveals a clear crossover at U similar or equal to 2.5 eV. In the weak coupling limit Z decreases for all correlated d orbitals as a function of U and beyond the crossover coupling they become weakly dependent on U while strongly dependent on J. A marked orbital dependence of the Z's emerges even if in general the orbital-selective Mott transition only occurs for relatively large values of U. This two-stage reduction of the quasiparticle coherence due to the combined effect of Hubbard U and the Hund's J suggests that the iron-based superconductors can be referred to as Hund's correlated metals. DOI: 10.1103/PhysRevB.87.045122

Orbital selectivity in Hund's metals: The iron chalcogenides

Capone, Massimo
2013-01-01

Abstract

We show that electron correlations lead to a bad metallic state in chalcogenides FeSe and FeTe despite the intermediate value of the Hubbard repulsion U and Hund's rule coupling J. The evolution of the quasiparticle weight Z as a function of the interaction terms reveals a clear crossover at U similar or equal to 2.5 eV. In the weak coupling limit Z decreases for all correlated d orbitals as a function of U and beyond the crossover coupling they become weakly dependent on U while strongly dependent on J. A marked orbital dependence of the Z's emerges even if in general the orbital-selective Mott transition only occurs for relatively large values of U. This two-stage reduction of the quasiparticle coherence due to the combined effect of Hubbard U and the Hund's J suggests that the iron-based superconductors can be referred to as Hund's correlated metals. DOI: 10.1103/PhysRevB.87.045122
2013
87
4
1
5
045122
https://arxiv.org/abs/1211.2015
Lanata, N; Strand, H. U. R; Giovannetti, G; Hellsing, B; de' Medici, L; Capone, Massimo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/11686
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