Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides
Xiuquan Zhou1,2, Christopher Eckberg2,3, Brandon Wilfong1,2
1Department of Chemistry and Biochemistry , University of Maryland , College Park , MD 20742 , USA .
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- Fe OH)FeS, [(Na1- Fe )(OH)2]FeS, and K Fe2- S2. 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- Fe OH) intercalate. Layered heterostructures of [(Na1- Fe )(OH)2]FeS resemble the natural mineral tochilinite, which contains an iron square lattice interleaved with a hexagonal hydroxide lattice. Whilst heterostructured [(Na1- Fe )(OH)2]FeS displays long-range magnetic ordering near 15 K, K Fe2- S2 displays short range antiferromagnetism.
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