Anharmonic theory of superconductivity in the high-pressure materials
Electron-phonon superconductors at high pressures have displayed the highest values of critical superconducting temperature Tc on record, now rapidly approaching room temperature. Despite the importance of high-P superconductivity in the quest for room-temperature superconductors, a mechanistic unde...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/705050 |
| Acceso en línea: | http://hdl.handle.net/10486/705050 https://dx.doi.org/10.1103/PhysRevB.103.094519 |
| Access Level: | acceso abierto |
| Palabra clave: | Anharmonicities Applied Pressure Effect of Pressure Function of Pressure Optical Phonon Energies Optical Phonons Room-Temperature Superconductors Física |
| Sumario: | Electron-phonon superconductors at high pressures have displayed the highest values of critical superconducting temperature Tc on record, now rapidly approaching room temperature. Despite the importance of high-P superconductivity in the quest for room-temperature superconductors, a mechanistic understanding of the effect of pressure and its complex interplay with phonon anharmonicity and superconductivity is missing, as numerical simulations can bring only system-specific details, clouding out key players controlling the physics. Here we develop a minimal model of electron-phonon superconductivity under an applied pressure which takes into account the anharmonic decoherence of the optical phonons. We find that Tc behaves nonmonotonically as a function of the ratio Γ/ω0, where Γ is the optical phonon damping and ω0 is the optical phonon energy at zero pressure and momentum. Optimal pairing occurs for a critical ratio Γ/ω0 when the phonons are on the verge of decoherence ("diffusonlike"limit). Our framework gives insights into recent experimental observations of Tc as a function of pressure in the complex BCS material TlInTe2 |
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