Giant anharmonicity suppresses superconductivity in AlH3 under pressure
Bruno Rousseau, Aitor Bergara
DOI 10.1103/PhysRevB.82.104504 · Physical Review B
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Abstract
The anharmonic self-energy of two zone boundary phonons were computed to lowest order for AlH3 in the Pm3¯n structure at 110 GPa. The wave vector and branch index corresponding to these modes are situated in a region of phase space providing most of the electron-phonon coupling. The self-energies are found to be very large and the anharmonic contribution to the linewidth of one of the modes studied could be distinguished from the electron-phonon linewidth. It is found that anharmonicity suppresses the electron-phonon coupling parameter λ, providing a possible explanation for the disagreement between experiment and previous theoretical studies of superconductivity in this system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| AlH3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | 110 GPa | unknown |
| AlH3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | 109 GPa | unknown |
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