Doping effects on the stability and superconductivity of penta-graphene-like ZrH10 and HfH10 under pressure
Hulei Yu, Yue Chen
DOI 10.1103/PhysRevB.106.024515 · Physical Review B
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Abstract
The discovery of room-temperature superconductors has aroused great attention in pressure-induced superhydrides. Herein we explore the doping effects on the newly proposed penta-graphene-like hydrides ZrH10 and HfH10 from first-principles calculations. Imaginary phonon frequencies of P63/mmcZrH10 and HfH10 at lower pressures are found to be eliminated by hole doping, leading to more accessible superconductivity. At high pressures, phonons are prone to be softened by electron doping, which increases the electron-phonon coupling and the superconducting critical temperature (Tc). Doping is found to be an effective way to lower the stabilization pressure and increase the Tc of P63/mmcZrH10 and HfH10. This work paves an avenue for realizing low-pressure high-Tc superconducting hydrides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ZrH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 220 | 250 GPa | unknown |
| HfH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 234 | 250 GPa | unknown |
| CaH6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 200 | 150 GPa | unknown |
| CaH6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 215 | Pressure not reported | unknown |
| H3S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 203 | 155 GPa | unknown |
| ZrH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 191.6 | 200 GPa | unknown |
| HfH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 191.6 | 200 GPa | unknown |
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