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Issue 5, 2017
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Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides

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Abstract

Inspired by naturally occurring sulfide minerals, we present a new family of iron-based superconductors. A metastable form of FeS known as the mineral mackinawite forms two-dimensional sheets that can be readily intercalated by various cationic guest species. Under hydrothermal conditions using alkali metal hydroxides, we prepare three different cation and metal hydroxide-intercalated FeS phases including (Li1−xFexOH)FeS, [(Na1−xFex)(OH)2]FeS, and KxFe2−yS2. Upon successful intercalation of the FeS layer, the superconducting critical temperature Tc of mackinawite is enhanced from 5 K to 8 K for the (Li1−xFexOH)δ+ intercalate. Layered heterostructures of [(Na1−xFex)(OH)2]FeS resemble the natural mineral tochilinite, which contains an iron square lattice interleaved with a hexagonal hydroxide lattice. Whilst heterostructured [(Na1−xFex)(OH)2]FeS displays long-range magnetic ordering near 15 K, KxFe2−yS2 displays short range antiferromagnetism.

Graphical abstract: Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides

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Publication details

The article was received on 01 Dec 2016, accepted on 11 Mar 2017 and first published on 13 Mar 2017


Article type: Edge Article
DOI: 10.1039/C6SC05268A
Citation: Chem. Sci., 2017,8, 3781-3788
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    Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides

    X. Zhou, C. Eckberg, B. Wilfong, S. Liou, H. K. Vivanco, J. Paglione and E. E. Rodriguez, Chem. Sci., 2017, 8, 3781
    DOI: 10.1039/C6SC05268A

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