Archivio Istituzionale della RicercaWe measure phonon dispersion and linewidth in a single crystal of MgB2 along the Gamma-A, Gamma-M, and A-L directions using inelastic x-ray scattering. We use density functional theory to compute the effect of both electron-phonon coupling and anharmonicity on the linewidth, obtaining excellent agreement with experiment. Anomalous broadening of the E(2g) phonon mode is found all along Gamma-A. The dominant contribution to the linewidth is always the electron-phonon coupling.
Phonon dispersion and lifetimes in MgB2 / Shukla, A; Calandra, M; D'Astuto, M; Lazzeri, M; Mauri, F; Bellin, C; Krisch, M; Karpinski, J; Kazakov, S. M.; Jun, J; Daghero, Dario; Parlinski, K.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 90:9(2003), pp. 095506-1-095506-4. [10.1103/PhysRevLett.90.095506]
Phonon dispersion and lifetimes in MgB2.
DAGHERO, Dario;
2003
Abstract
We measure phonon dispersion and linewidth in a single crystal of MgB2 along the Gamma-A, Gamma-M, and A-L directions using inelastic x-ray scattering. We use density functional theory to compute the effect of both electron-phonon coupling and anharmonicity on the linewidth, obtaining excellent agreement with experiment. Anomalous broadening of the E(2g) phonon mode is found all along Gamma-A. The dominant contribution to the linewidth is always the electron-phonon coupling.
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https://hdl.handle.net/11583/1639296
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