Machine learning guided discovery of superconducting calcium borocarbides
Journal Article
·
· Physical Review. B
- Yantai University (China)
- Jiyang College of Zhejiang Agriculture and Forestry University, Zhuji (China)
- Iowa State University, Ames, IA (United States)
- Ames Laboratory, and Iowa State University, Ames, IA (United States)
Pursuit of superconductivity in light-element systems at ambient pressure is of great experimental and theoretical interest. In this work, we combine a machine learning (ML) method with first-principles calculations to efficiently search for the energetically favorable ternary Ca-B-C compounds. Three layered borocarbides (stable CaBC5 and metastable Ca2BC11 and CaB3C3) are predicted to be phonon-mediated superconductors at ambient pressure. The stable CaBC5 and the low-energy metastable Ca2BC11 (with formation energy only 9.5 meV/atom above the convex hull) have a superconducting Tc of 5.2 and 8.9 K, respectively. While the hexagonal CaB3C3 possesses a Tc of 26.1 K, it is metastable with formation energy of 153 meV/atom above the convex hull. The ML-guided approach opens up a way for greatly accelerating the discovery of new high-Tc superconductors.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Natural Science Foundation of China
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1993988
- Report Number(s):
- IS-J -11,119
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 108; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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