Superconductivity in Bi3O2S2Cl with Bi-Cl Planar Layers

Bin-Bin Ruan; Kang Zhao; Qing-Ge Mu; Bo-Jin Pan; Tong Liu; Huai-Xin Yang; Jian-Qi Li; Gen-Fu Chen; Zhi-An Ren

doi:10.1021/jacs.8b13796

Superconductivity in Bi₃O₂S₂Cl with Bi-Cl Planar Layers

J Am Chem Soc. 2019 Feb 27;141(8):3404-3408. doi: 10.1021/jacs.8b13796. Epub 2019 Feb 13.

Authors

Bin-Bin Ruan^{1

2}, Kang Zhao^{1

2}, Qing-Ge Mu^{1

2}, Bo-Jin Pan^{1

2}, Tong Liu^{1

2}, Huai-Xin Yang^{1

2

3

4}, Jian-Qi Li^{1

2

3

4}, Gen-Fu Chen^{1

2

3

4}, Zhi-An Ren^{1

2

3

4}

Affiliations

¹ Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190 , People's Republic of China.
² School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China.
³ Collaborative Innovation Center of Quantum Matter , Beijing 100190 , People's Republic of China.
⁴ Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , People's Republic of China.

PMID: 30739447
DOI: 10.1021/jacs.8b13796

Abstract

A quaternary compound Bi₃O₂S₂Cl, which consists of novel [BiS₂Cl]^2- layers, is reported. It adopts a layered structure of the space group I4/ mmm (No. 139) with lattice parameters: a = 3.927(1) Å, c = 21.720(5) Å. In this compound, bismuth and chlorine atoms form an infinite planar layer, which is unique among the bismuth halides. Superconductivity is observed in both polycrystals and single crystals, and is significantly enhanced in the samples prepared with less sulfur or at higher temperatures. By tuning the content of sulfur, Bi₃O₂S₂Cl can be converted from a semiconductor into a superconductor. The superconducting critical temperature ranges from 2.6 to 3.5 K. Our discovery of the [BiS₂Cl]^2- layer opens another door in searching for the bismuth compounds with novel physical properties.