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Title: Superconductivity in the Li-B-C system at 100 GPa

Journal Article · · Physical Review. B
 [1]; ORCiD logo [2];  [3];  [1];  [4]; ORCiD logo [1];  [4];  [4];  [5]
  1. Xiamen University (China)
  2. Xiamen University (China); Iowa State Univ., Ames, IA (United States); Columbia Univ., New York, NY (United States)
  3. Guangdong University of Technology, Guangzhou (China)
  4. Iowa State Univ., Ames, IA (United States); Ames Lab., Ames, IA (United States)
  5. Iowa State Univ., Ames, IA (United States)

Layer Li-B-C compounds have been shown to have feasible superconductivity. Using the adaptive genetic algorithm, we predict the structures of the Li-B-C system at 100 GPa. Here we identify several low-enthalpy metallic phases with stoichiometries of Li B2C, Li B3C, Li2 BC2, Li3 B2C3, Li3 BC, and Li5 BC. Using a fast screening method of electron-phonon interaction, we find that Li B3C is a promising candidate for superconductivity. The consecutive calculations using the full Brillouin zone confirm the existence of the strong electron-phonon coupling (EPC) in this system. The anharmonic B-C phonon modes near the zone center provide the major contribution to the EPC. The EPC constant is 1.40, and the estimated critical temperature is 22 K. In this paper, we indicate that superconductivity can also happen without a layered structural motif in the Li-B-C system. We also demonstrate an effective strategy for crystal structure prediction of superconducting materials.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); Guangdong Basic and Applied Basic Research Foundation; National Science Foundation (NSF)
Grant/Contract Number:
AC02-07CH11358; 11874307; 2021A1515110328; 2022A1515012174; DMR-2132666
OSTI ID:
1923462
Report Number(s):
IS-J-10,987; TRN: US2312423
Journal Information:
Physical Review. B, Vol. 107, Issue 1; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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