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Article Dans Une Revue Physical Review Letters Année : 2003

Phonon dispersion and lifetimes in MgB2

Résumé

We measure phonon dispersion and linewidth in a single crystal of MgB_2 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.

Dates et versions

hal-00019067 , version 1 (15-02-2006)

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Abhay Shukla, Matteo Calandra, Matteo d'Astuto, Michele Lazzeri, Francesco Mauri, et al.. Phonon dispersion and lifetimes in MgB2. Physical Review Letters, 2003, 90, pp.095506. ⟨hal-00019067⟩
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