Kohn Anomaly in MgB2 by Inelastic X-Ray Scattering

Details Kohn Anomaly in MgB2 by Inelastic X-Ray Scattering Kohn Anomaly in MgB2 by Inelastic X-Ray Scattering

2003-09-05

arxiv.org/abs/cond-mat/0309123v1

Physics

Condensed Matter

7 Pages of text and references 4 Figures in 4 pages

Scientific paper

10.1103/PhysRevLett.92.197004

We study phonons in MgB2 using inelastic x-ray scattering (1.6 and 6 meV resolution). Our measurements show excellent agreement with theory for the dispersion and line-width: we clearly observe the softening and broadening of the crucial E2g mode through the Kohn anomaly along GM. Low temperature measurements (just above and below Tc) show negligible changes for the momentum-transfers investigated, and no change in the E2g mode at A between room temperature and 16K. We report the presence of a longitudinal mode along GA near in energy to the E2g mode that is not predicted by theory.

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