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  • Title: A Mott insulator continuously connected to iron pnictide superconductors.
    Author: Song Y, Yamani Z, Cao C, Li Y, Zhang C, Chen JS, Huang Q, Wu H, Tao J, Zhu Y, Tian W, Chi S, Cao H, Huang YB, Dantz M, Schmitt T, Yu R, Nevidomskyy AH, Morosan E, Si Q, Dai P.
    Journal: Nat Commun; 2016 Dec 19; 7():13879. PubMed ID: 27991514.
    Abstract:
    Iron-based superconductivity develops near an antiferromagnetic order and out of a bad-metal normal state, which has been interpreted as originating from a proximate Mott transition. Whether an actual Mott insulator can be realized in the phase diagram of the iron pnictides remains an open question. Here we use transport, transmission electron microscopy, X-ray absorption spectroscopy, resonant inelastic X-ray scattering and neutron scattering to demonstrate that NaFe1-xCuxAs near x≈0.5 exhibits real space Fe and Cu ordering, and are antiferromagnetic insulators with the insulating behaviour persisting above the Néel temperature, indicative of a Mott insulator. On decreasing x from 0.5, the antiferromagnetic-ordered moment continuously decreases, yielding to superconductivity ∼x=0.05. Our discovery of a Mott-insulating state in NaFe1-xCuxAs thus makes it the only known Fe-based material, in which superconductivity can be smoothly connected to the Mott-insulating state, highlighting the important role of electron correlations in the high-Tc superconductivity.
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