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Mott-Kondo Insulator Behavior in the Iron Oxychalcogenides
- Source :
- Phys. Rev. B 92, 155139 (2015)
- Publication Year :
- 2015
-
Abstract
- We perform a combined experimental-theoretical study of the Fe-oxychalcogenides (FeO$\emph{Ch}$) series La$_{2}$O$_{2}$Fe$_{2}$O\emph{M}$_{2}$ (\emph{M}=S, Se), which is the latest among the Fe-based materials with the potential \ to show unconventional high-T$_{c}$ superconductivity (HTSC). A combination of incoherent Hubbard features in X-ray absorption (XAS) and resonant inelastic X-ray scattering (RIXS) spectra, as well as resitivity data, reveal that the parent FeO$\emph{Ch}$ are correlation-driven insulators. To uncover microscopics underlying these findings, we perform local density approximation-plus-dynamical mean field theory (LDA+DMFT) calculations that unravel a Mott-Kondo insulating state. Based upon good agreement between theory and a range of data, we propose that FeO$\emph{Ch}$ may constitute a new, ideal testing ground to explore HTSC arising from a strange metal proximate to a novel selective-Mott quantum criticality.
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
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Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 92, 155139 (2015)
- Publication Type :
- Report
- Accession number :
- edsarx.1501.00332
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.92.155139