We measure phonon dispersion and linewidth in a single crystal of [Formula presented] along the [Formula presented], [Formula presented], and [Formula presented] 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 [Formula presented] phonon mode is found all along [Formula presented]. The dominant contribution to the linewidth is always the electron-phonon coupling. © 2003 The American Physical Society.
Phonon Dispersion and Lifetimes in [Formula presented] / Shukla, A., Calandra, M., D'Astuto, M., Lazzeri, M., Mauri, F., Bellin, C., Krisch, M., Karpinski, J., Kazakov, S.M., Jun, J., Daghero, D., Parlinski, K.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 90:9(2003), p. 4. [10.1103/PhysRevLett.90.095506]
Phonon Dispersion and Lifetimes in [Formula presented]
Calandra M.;
2003-01-01
Abstract
We measure phonon dispersion and linewidth in a single crystal of [Formula presented] along the [Formula presented], [Formula presented], and [Formula presented] 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 [Formula presented] phonon mode is found all along [Formula presented]. The dominant contribution to the linewidth is always the electron-phonon coupling. © 2003 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
