Superconductivity in Co-Layered LaCoSi

Zhengwen He; Rongjin Huang; Kaiyao Zhou; Ye Liu; Shibin Guo; Yuzhu Song; Zhongnan Guo; Shuxian Hu; Lunhua He; Qingzhen Huang; Laifeng Li; Jingyan Zhang; Shouguo Wang; Jiangang Guo; Xianran Xing; Jun Chen

doi:10.1021/acs.inorgchem.1c00699

Superconductivity in Co-Layered LaCoSi

Inorg Chem. 2021 May 3;60(9):6157-6161. doi: 10.1021/acs.inorgchem.1c00699. Epub 2021 Apr 22.

Authors

Zhengwen He¹, Rongjin Huang², Kaiyao Zhou³, Ye Liu¹, Shibin Guo², Yuzhu Song¹, Zhongnan Guo⁴, Shuxian Hu¹, Lunhua He⁵, Qingzhen Huang⁶, Laifeng Li², Jingyan Zhang⁷, Shouguo Wang⁷, Jiangang Guo³, Xianran Xing¹, Jun Chen¹

Affiliations

¹ Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
² Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100049, China.
³ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China.
⁴ Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
⁵ Songshan Lake Materials Laboratory, China Spallation Neutron Source (CSNS), Dongguan, Guangdong 523808, China.
⁶ NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States.
⁷ School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

PMID: 33885292
DOI: 10.1021/acs.inorgchem.1c00699

Abstract

It is known that few Co-based superconducting compounds have been found compared with their Fe- or Ni-based counterparts. In this study, we have found superconductivity of 4 K in the LaCoSi compound for the first time. The combined analysis of neutron and synchrotron X-ray powder diffractions reveals that LaCoSi exhibits an isostructure with the known Fe-based LiFeAs superconductor, which is the first "111" Co-based superconductor. First-principles calculation shows that LaCoSi presents a quasi-two-dimensional band structure that is also similar to that of LiFeAs. The small structural distortion may be more conducive to the emergence of superconductivity in the LaCoSi compound, which provides a direction for finding new Co-based superconducting compounds.