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Orbital Selectivity in Hund's metals: The Iron Chalcogenides
Department of Physics and Astronomy, Rutgers University, Piscataway New Jersey, USA.
Department of Physics, University of Gothenburg, Gothenburg, Sweden.ORCID iD: 0000-0002-7263-4403
CNR-IOM Democritos National Simulation Center and Scuola Internazionale Superiore di Studi Avanzati (SISSA), Trieste, Italy.
Department of Physics, University of Gothenburg, Gothenburg, Sweden.
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2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, no 4, article id 045122Article in journal (Refereed) Published
Abstract [en]

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 quasi particle weight Z as a function of the interaction terms reveals a clear crossover at U≃ 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 depend 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 quasi particle 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. 

Place, publisher, year, edition, pages
American Physical Society, 2013. Vol. 87, no 4, article id 045122
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-90011DOI: 10.1103/PhysRevB.87.045122ISI: 000313941800001Scopus ID: 2-s2.0-84873032119OAI: oai:DiVA.org:oru-90011DiVA, id: diva2:1531460
Note

Funding Agencies:

European Research Council (ERC)

European Commission 240524

Mathematics Physics Platform (MP2) at the University of Gothenburg  

French National Research Agency (ANR)

European Commission ANR-09-RPDOC-019-01

Swedish National Infrastructure for Computing (SNIC) at Chalmers Centre for Computational Science and Engineering (C3SE) 001-10-37

Available from: 2021-02-26 Created: 2021-02-26 Last updated: 2021-02-26Bibliographically approved

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Strand, Hugo

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