Phonon dispersion and lifetimes in MgB2

Details Phonon dispersion and lifetimes in MgB2 Phonon dispersion and lifetimes in MgB2

2002-09-03

arxiv.org/abs/cond-mat/0209064v2

Phys. Rev. Lett. 90, 095506 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.095506

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.

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