Two-phonon contributions to the inelastic x-ray scattering spectra ofMgB2

2007/01/04 by A. Q. R. Baron, Alfred Q. R. Baron, H. Uchiyama +12 · 2 citations
Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.75.020505

published as PHYSICAL REVIEW B 75, 020505(R) 2007 · 8 Pages, 4 Figures Please reference Phys. Rev. B 75, 020505(R), 2007

openalex publication_date 2007/01/04 · arxiv created 2007/02/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Two-phonon contributions to meV-resolved, inelastic x-ray scattering spectra of MgB₂ at 300\phantom\rule0.3em0exK are identified, in good agreement, in both intensity and energy, with a harmonic calculation using the force constant matrix from ab initio calculations. This contribution impacts the determination of the linewidth of the E_2g phonon mode that is so important for the high T_c of this material. To the best of our knowledge, this is the first observation of peaks in measurements of phonon dispersion (q>0) due to two-phonon scattering in a non-rare-gas solid.

Citations

• Kohn Anomaly inMgB2by Inelastic X-Ray Scattering
• Dynamical Theory of Crystal Lattices

Cited by

• Weak anharmonic effects inMgB2: A comparative inelastic x-ray scattering and Raman study
• Soft-phonon-driven superconductivity in CaAlSi as seen by inelastic x-ray scattering