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Giant anharmonicity suppresses superconductivity in AlH3 under pressure

AuthorsRousseau, Bruno ; Bergara, Aitor
Issue Date2010
PublisherAmerican Physical Society
CitationPhysical Review B 82(10): 104504 (2010)
AbstractThe anharmonic self-energy of two zone boundary phonons were computed to lowest order for AlH3 in the Pm3̅ 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.
Description9 páginas, 2 tablas, 4 figuras.-- PACS number(s): 74.70.Ad, 63.20.Ry, 63.20.kd, 81.40.Vw.-- Trabajo presentado a la "Gordon Research Conference: Research at High Pressure" (EE.UU., 27 de junio al 2 de julio de 2010) y a "The 48th European High Pressure Research Group Conference" (Suiza, 25 al 29 de julio de 2010).
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.82.104504
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