Mott-Kondo insulator behavior in the iron oxychalcogenides

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DOIResolve DOI: https://doi.org/10.1103/PhysRevB.92.155139
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  1. National Research Council Canada. Security and Disruptive Technologies
FormatText
TypeArticle
Journal titlePhysical Review B
ISSN1098-0121
1550-235X
Volume92
Issue15
Article number155139
Pages155139-1–155139-10
Abstract
We perform a combined experimental-theoretical study of the Fe-oxychalcogenides (FeOCh) series La2O2Fe2OM2 (M=S, Se), which are among the latest Fe-based materials with the potential to show unconventional high-Tc superconductivity (HTSC). A combination of incoherent Hubbard features in x-ray absorption and resonant inelastic x-ray scattering spectra, as well as resistivity data, reveal that the parent FeOCh are correlation-driven insulators. To uncover microscopics underlying these findings, we perform local density approximation-plus-dynamical mean field theory (LDA+DMFT) calculations that reveal a novel Mott-Kondo insulating state. Based upon good agreement between theory and a range of data, we propose that FeOCh may constitute an ideal testing ground to explore HTSC arising from a strange metal proximate to a novel selective-Mott quantum criticality.
Publication date
PublisherAmerican Physical Society
LanguageEnglish
Peer reviewedYes
NPARC number23001562
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