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

doi:10.1103/PhysRevLett.90.095506

Phonon dispersion and lifetimes in MgB2

Superconductivity 2009-11-07 v2 Materials Science

Authors: 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

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

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.

Keywords

phonon modes and lattice dynamics electron-phonon coupling wave scattering in disordered media

Cite

@article{arxiv.cond-mat/0209064,
  title  = {Phonon dispersion and lifetimes in MgB2},
  author = {Abhay Shukla and Matteo Calandra and Matteo d'Astuto and Michele Lazzeri and Francesco Mauri and Christophe Bellin and Michael Krisch and J. Karpinski and S. M. Kazakov and J. Jun and D. Daghero and K. Parlinski},
  journal= {arXiv preprint arXiv:cond-mat/0209064},
  year   = {2009}
}

Comments

4 pages, 3 figures

Phonon dispersion and lifetimes in MgB2

Abstract

Keywords

Cite

Comments

Related papers