Phonon-mode specific contributions to room-temperature superconductivity in atomic hydrogen at high pressures
Ashok K. Verma, P. Modak, Fabian Schrodi, Alex Aperis, Peter M. Oppeneer
DOI 10.1103/PhysRevB.103.094505 · Physical Review B
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Abstract
We investigate the role of specific phonon mode symmetries for the room-temperature superconductivity in atomic hydrogen under large pressure. Using anisotropic Migdal-Eliashberg theory with ab initio input from density functional theory, we show that the Eu phonon modes are the dominant driving force for obtaining such high critical temperatures. When going from 400 to 600 GPa, we find an increased transition temperature; however, the total electron-phonon coupling strength is counterintuitively reduced. Our analysis reveals that this is due to an enhanced contribution to the coupling strength by the Eu phonon mode. We furthermore compute the momentum anisotropy of the superconducting gap which we find to be relatively small, about 7% of the mean gap value at 100 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| H3S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 203 | 155 GPa | unknown |
| LaH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 250 | 170 GPa | unknown |
| YH6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 220 | 166 GPa | unknown |
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