The theoretical understanding of the nematic state of iron-based superconductors and especially of FeSe is still a puzzling problem. Although a number of experiments call for a prominent role of local correlations and place iron superconductors at the entrance of a Hund's metal state, the effect of the electronic correlations on the nematic state has been theoretically poorly investigated. In this work we study the nematic phase of iron superconductors accounting for local correlations, including the effect of the Hund's coupling. We show that Hund's physics strongly affects the nematic properties of the system. It severely constrains the precise nature of the feasible orbital-ordered state and induces a differentiation in the effective masses of the zx/yz orbitals in the nematic phase. The latter effect leads to distinctive signatures in different experimental probes overlooked so far in the interpretation of experiments. As notable examples the splittings between zx and yz bands at Γ and M points are modified, with important consequences for angle-resolved photoemission spectroscopy measurements.

Nematicity at the Hund's metal crossover in iron superconductors / Fanfarillo, Laura; Giovannetti, G.; Capone, Massimo; Bascones, E.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 95:14(2017), pp. 1-7. [10.1103/PhysRevB.95.144511]

Nematicity at the Hund's metal crossover in iron superconductors

Fanfarillo, Laura;Capone, Massimo;
2017-01-01

Abstract

The theoretical understanding of the nematic state of iron-based superconductors and especially of FeSe is still a puzzling problem. Although a number of experiments call for a prominent role of local correlations and place iron superconductors at the entrance of a Hund's metal state, the effect of the electronic correlations on the nematic state has been theoretically poorly investigated. In this work we study the nematic phase of iron superconductors accounting for local correlations, including the effect of the Hund's coupling. We show that Hund's physics strongly affects the nematic properties of the system. It severely constrains the precise nature of the feasible orbital-ordered state and induces a differentiation in the effective masses of the zx/yz orbitals in the nematic phase. The latter effect leads to distinctive signatures in different experimental probes overlooked so far in the interpretation of experiments. As notable examples the splittings between zx and yz bands at Γ and M points are modified, with important consequences for angle-resolved photoemission spectroscopy measurements.
2017
95
14
1
7
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.144511
Fanfarillo, Laura; Giovannetti, G.; Capone, Massimo; Bascones, E.
File in questo prodotto:
File Dimensione Formato  
PhysRevB.95.144511.pdf

non disponibili

Descrizione: Articolo completo
Tipologia: Versione Editoriale (PDF)
Licenza: Non specificato
Dimensione 426.23 kB
Formato Adobe PDF
426.23 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
1609.06672.pdf

accesso aperto

Descrizione: Accepted version
Tipologia: Documento in Post-print
Licenza: Non specificato
Dimensione 1.87 MB
Formato Adobe PDF
1.87 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/50412
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 50
  • ???jsp.display-item.citation.isi??? 49
social impact