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Stacking variants and superconductivity in the Bi-O-S system
W Adam Phelan1, David C Wallace, Kathryn E Arpino
1Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Journal of the American Chemical Society
|March 27, 2013
Summary
Researchers identified new Bi-O-S compounds, with Bi3O2S3 exhibiting superconductivity at 4.5 K. Superconductivity is linked to stacking faults, offering insights into electronic conductivity in these materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- High-temperature superconductivity is crucial for applications like sensors and energy distribution.
- Compounds with BiS2 layers show promise for advancing superconductivity research.
Purpose of the Study:
- To identify and characterize new ternary bismuth oxy-sulfide (Bi-O-S) compounds.
- To investigate the origin of superconductivity in these materials and its relationship with structural properties.
Main Methods:
- Synthesis and characterization of new Bi-O-S compounds.
- Measurement of superconducting properties, including critical temperature (Tc) and Meissner shielding.
- Analysis of the impact of stacking faults on superconductivity.
Main Results:
- Two new ternary compounds, Bi2OS2 (non-superconducting) and Bi3O2S3, were identified.
- Bi3O2S3 is likely responsible for previously reported superconductivity at 4.5 K in "Bi4O4S3".
- Superconductivity in Bi3O2S3 is sensitive to Bi2OS2-like stacking faults; fewer faults enhance superconductivity.
Conclusions:
- The study identifies Bi3O2S3 as a key superconducting material in the Bi-O-S system.
- Stacking fault density is a critical factor influencing the superconducting properties of Bi3O2S3.
- Understanding these faults may unlock pathways to higher-temperature superconductivity in similar compounds.
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