Orbital Selectivity in Hund's metals: The Iron ChalcogenidesShow others and affiliations
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
2021-02-262021-02-262021-02-26Bibliographically approved