Superconductivity in compounds of sodium-intercalated graphite
Chun-Mei Hao, Xing Li, Artem R. Oganov, Jingyu Hou, Shicong Ding, Yanfeng Ge, Lin Wang, Xiao Dong, Hui-Tian Wang, Guochun Yang, Xiang-Feng Zhou, Yongjun Tian
DOI 10.1103/PhysRevB.108.214507 · Physical Review B
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Abstract
The discovery of superconductivity in CaC6 with a critical temperature (Tc) of 11.5 K reignited much interest in exploring high-temperature superconductivity in graphite intercalation compounds (GICs). Here we identify a GIC NaC4, discovered by ab initio evolutionary structure search, as a superconductor with a computed Tc of 41.2 K at 5 GPa. This value is eight times higher than that of the synthesized GIC NaC2 and possesses the highest Tc among available GICs. The remarkable superconductivity of GIC NaC4 mainly arises from the coupling of π electrons in graphene with the low-frequency vibrations involving both Na and C atoms. These findings suggest that Na GICs may hold great promise as high-Tc superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure not reported | unknown |
| NaC4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41.2 | 5 GPa | unknown |
| NaC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | 3.5 GPa | unknown |
| LiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.9 | 3.3 GPa | unknown |
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.1 | 7.5 GPa | unknown |
| NaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 116 | Pressure not reported | unknown |
| NaC8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | unknown |
| NaC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.4 | 3.5 GPa | unknown |
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