Phonon Dispersion and Lifetimes inMgB2

2002/09/30 by Abhay Shukla, Matteo Calandra, M. d’Astuto +14 · 2 citations
Materials Science · Physics and Astronomy · #Anharmonicity #Atomic physics #Condensed matter physics #Coupling (piping) #Dispersion (optics) #Laser #Laser linewidth #Materials science #Optics #Phonon #Physics #Physics of Superconductivity and Magnetism #Scattering #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.90.095506

published as Phys. Rev. Lett. 90, 095506 (2003) · 4 pages, 3 figures

arxiv created 2003/01/07 · openalex publication_date 2003/03/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We measure phonon dispersion and linewidth in a single crystal of MgB₂ along the \ensuremathΓ\mathrm\text\ensuremath-A, \ensuremathΓ\mathrm\text\ensuremath-M, and A\mathrm\text\ensuremath-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 \ensuremathΓ\mathrm\text\ensuremath-A. The dominant contribution to the linewidth is always the electron-phonon coupling.

Citations

• Effect of the Al content on the optical phonon spectrum inMg1−xAlxB2
• Generalized Gradient Approximation Made Simple
• Neutron Spectroscopy of Superconductors
• Phonon Dispersion and Electron-Phonon Coupling inMgB2andAlB2
• Raman spectrum and lattice parameters ofMgB2as a function of pressure
• Phonon Density of States inMgB2
• The Electron–Phonon Interaction in Metals

Cited by

• Theory of Raman scattering from Leggett’s collective mode in a multiband superconductor: Application toMgB2
• Weak anharmonic effects inMgB2: A comparative inelastic x-ray scattering and Raman study