Phonon dispersion and lifetimes in MgB2
Abhay Shukla, Matteo Calandra, Matteo d'Astuto, Michele Lazzeri, Francesco Mauri, Christophe Bellin, Michael Krisch, J. Karpinski, S. M. Kazakov, J. Jun, D. Daghero, K. Parlinski
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 E2g phonon mode is found all along Gamma-A. The dominant contribution to the linewidth is always the electron-phonon coupling.
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