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Mott-Kondo insulator behavior in the iron oxychalcogenides

Freelon, B., Liu, Yu Hao, Chen, Jeng-Lung, Craco, L., Laad, M. S., Leoni, S., Chen, Jiaqi, Tao, Li, Wang, Hangdong, Flauca, R., Yamani, Z., Fang, Minghu, Chang, Chinglin, Guo, J.-H. and Hussain, Z. 2015. Mott-Kondo insulator behavior in the iron oxychalcogenides. Physical Review B 92 (15) , 155139. 10.1103/PhysRevB.92.155139

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Subjects: Q Science > QD Chemistry
Publisher: American Physical Society
ISSN: 1098-0121
Last Modified: 16 Sep 2020 10:00

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