Phonon dispersion and lifetimes in MgB2.
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 E(2g) phonon mode is found all along Gamma-A. The dominant contribution to the linewidth is always the electron-phonon coupling.
Shukla
Abhay
A
Laboratoire de Minéralogie-Cristallographie, case 115, 4 Place Jussieu, 75252, Paris cedex 05, France.
Calandra
Matteo
M
D'Astuto
Matteo
M
Lazzeri
Michele
M
Mauri
Francesco
F
Bellin
Christophe
C
Krisch
Michael
M
Karpinski
J
J
Kazakov
S M
SM
Jun
J
J
Daghero
D
D
Parlinski
K
K