Journal
PHYSICAL REVIEW LETTERS
Volume 92, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.92.197004
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We study phonons in MgB2 using inelastic x-ray scattering (1.6 and 6 meV resolution). We clearly observe the softening and broadening of the crucial E-2g mode through the Kohn anomaly along GammaM, in excellent agreement with ab initio calculations. Low temperature measurements ( just above and below T-c) show negligible changes for the momentum transfers investigated and no change in the E-2g mode at A between room temperature and 16 K. We report the presence of a longitudinal mode along GammaA near in energy to the E-2g mode that is not predicted by theory.
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