Chin. Phys. Lett.  2021, Vol. 38 Issue (3): 036201    DOI: 10.1088/0256-307X/38/3/036201
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Novel Superconducting Electrides in Ca–S System under High Pressures
Yun-Xian Liu , Chao Wang*, Shuai Han , Xin Chen , Hai-Rui Sun , and Xiao-Bing Liu*
Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China
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Yun-Xian Liu , Chao Wang, Shuai Han  et al  2021 Chin. Phys. Lett. 38 036201
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Abstract Due to their unique structure properties, most of the electrides that possess extra electrons locating in interstitial regions as anions are insulators. Metallic and superconducting electrides are very rare under ambient conditions. We systematically search possible compounds in Ca–S systems stabilized under various pressures up to 200 GPa, and investigate their crystal structures and properties using first-principles calculations. We predict a series of novel stoichiometries in Ca–S systems as potential superconductors, including $P2_{1}/m$ Ca$_{3}$S, $P$4mbm Ca$_{3}$S, Pnma Ca$_{2}$S, Cmcm Ca$_{2}$S, Fddd CaS$_{2}$, Immm CaS$_{3}$ and $C2/c$ CaS$_{4}$. The $P4mbm$ Ca$_{3}$S phase exhibits a maximum $T_{\rm c}$ value of $\sim $20 K. It is interesting to notice that the $P2_{1}/m$ Ca$_{3}$S and Pnma Ca$_{2}$S stabilized at 60 and 50 GPa behave as superconducting electrides with critical temperatures $T_{\rm c}$ of 7.04 K and 0.26 K, respectively. More importantly, our results demonstrate that $P2_{1}/m$ Ca$_{3}$S and Pnma Ca$_{2}$S are dynamically stable at 5 GPa and 0 GPa, respectively, indicating a high possibility to be quenched to ambient condition or synthesized using the large volume press.
Received: 22 December 2020      Published: 02 March 2021
PACS:  62.50.-p (High-pressure effects in solids and liquids)  
  61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)  
  71.20.-b (Electron density of states and band structure of crystalline solids)  
Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11704220, 11804184, 11974208 and 11804185), the Shandong Provincial Natural Science Foundation (Grant Nos. ZR2017BA020, ZR2018PA010, ZR2019MA054 and ZR2017BA012).
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http://cpl.iphy.ac.cn/10.1088/0256-307X/38/3/036201       OR      http://cpl.iphy.ac.cn/Y2021/V38/I3/036201
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Yun-Xian Liu 
Chao Wang
Shuai Han 
Xin Chen 
Hai-Rui Sun 
and Xiao-Bing Liu
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