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Updated: Jan 29, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Superconductivity in Bi3O2S2Cl with Bi-Cl Planar Layers
Bin-Bin Ruan1,2, Kang Zhao1,2, Qing-Ge Mu1,2
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190 , People's Republic of China.
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.
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