四方相 FeS 中超导的观测。

Observation of Superconductivity in Tetragonal FeS.

机构信息

†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.

出版信息

J Am Chem Soc. 2015 Aug 19;137(32):10148-51. doi: 10.1021/jacs.5b06687. Epub 2015 Aug 10.

DOI:10.1021/jacs.5b06687

PMID:26244711

Abstract

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.

摘要

四方相 FeS 中存在超导的可能性引起了相当大的关注，因为它与 FeSe 超导体有相似之处。然而，迄今为止，所有试图在四方相 FeS 中实现超导的努力都失败了，关于四方相 FeS 是金属还是半导体仍存在争议。在这里，我们报道了在由铁粉与硫化物溶液水热反应合成的四方相 FeS 中观察到的 5 K 超导现象。与文献中报道的亚稳且对空气敏感的相比较，所得到的样品具有高结晶度和低空气敏感性。磁性和电性测量表明，样品在正常状态下表现为顺磁金属，在 5 K 以下表现出超导性。样品的高结晶度和化学计量比在超导观测中起着重要作用。本研究结果表明，四方相 FeS 是实现高温超导体的一个很有前途的新平台。