Superconductivity of graphenelike hydrogen in H2He at high pressure
Kang Yang, Wenwen Cui, Jian Hao, Jingming Shi, Yinwei Li
DOI 10.1103/PhysRevB.107.024501 · Physical Review B
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Abstract
The structural diversity of hydrogen under high pressure is crucial for understanding its physical properties, especially for the superconductivity. Here, a combination of crystal structure prediction and first-principle calculations has predicted a metastable H2He at ultrahigh pressure of 800 GPa, where H atoms are arranged in graphenelike structure. H2He shows weak superconductivity with critical temperature of 4 K, which significantly increases to 155 and 201 K at electron doping of 0.6 and 1.2 e, respectively. Analysis suggests that the enhanced superconductivity is closely associated with the graphenelike H sublattice. The doped electrons almost transfer to H sublattice, inducing the increased H-derived density of states at the Fermi level, as well as their coupling with the phonon modes of graphenelike H layers. The current results could stimulate the experiment to search for more diverse hydrogen species at high pressure and provide a feasible way to design high-Tc superconductors as well.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| H2He Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | 800 GPa | unknown |
| H2He Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 155 | 800 GPa | unknown |
| H2He Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 201 | 800 GPa | unknown |
| YH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 303 | 400 GPa | unknown |
| Li2MgH16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 473 | 300 GPa | unknown |
| CeH9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 148 | Pressure not reported | unknown |
| CeH9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
| FeH5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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