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Observation of Superconductivity in Tetragonal FeS

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Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Cite this: J. Am. Chem. Soc. 2015, 137, 32, 10148–10151
Publication Date (Web):August 5, 2015
https://doi.org/10.1021/jacs.5b06687
Copyright © 2015 American Chemical Society
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Abstract

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The possibility of superconductivity in tetragonal FeS has attracted considerable interest because of its similarities to the FeSe superconductor. However, all efforts made to pursue superconductivity in tetragonal FeS have failed so far, and it remains controversial whether tetragonal FeS is metallic or semiconducting. Here we report the observation of superconductivity at 5 K in tetragonal FeS that is synthesized by the hydrothermal reaction of iron powder with sulfide solution. The obtained samples are highly crystalline and less air-sensitive, in contrast to those reported in the literature, which are meta-stable and air-sensitive. Magnetic and electrical properties measurements show that the samples behave as a paramagnetic metal in the normal state and exhibit superconductivity below 5 K. The high crystallinity and the stoichiometry of the samples play important roles in the observation of superconductivity. The present results demonstrate that tetragonal FeS is a promising new platform to realize high-temperature superconductors.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/jacs.5b06687.

  • X-ray crystallographic data in CIF format for tetragonal FeS (CIF)

  • XPS spectra of tetragonal FeS (Figures S1–S3), PXRD pattern (Figure S4), and magnetization and electrical resistivity (Figures S5 and S6) of the sample exposed in air for over three months (PDF)

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