Kohn Anomaly in MgB2 by Inelastic X-Ray Scattering

Abstract

We study phonons in MgB2 using inelastic x-ray scattering (1.6 and 6 meV resolution). Our measurements show excellent agreement with theory for the dispersion and line-width: we clearly observe the softening and broadening of the crucial E2g mode through the Kohn anomaly along GM. Low temperature measurements (just above and below Tc) show negligible changes for the momentum-transfers investigated, and no change in the E2g mode at A between room temperature and 16K. We report the presence of a longitudinal mode along GA near in energy to the E2g mode that is not predicted by theory.

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References in corpus (18)

• Superconductivity of metallic boron in MgB_2
• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity of MgB2: Covalent Bonds Driven Metallic
• Electron-phonon interaction in the normal and superconducting states of MgB2
• Specific Heat of Mg ^{11}B_2
• Phonon dispersion and electron-phonon coupling in MgB_2 and AlB_2
• Giant anharmonicity and non-linear electron-phonon coupling in MgB${}_2$; A combined first-principles calculations and neutron scattering study
• Specific heat in the superconducting and normal state (2-300 K, 0-16 Teslas), and magnetic susceptibility of the 38-K superconductor MgB2: evidence for a multicomponent gap
• Growth, structure analysis and anisotropic superconducting properties of MgB2 single crystals
• Phonon Density-of-States in MgB2
• Phonon dispersion and lifetimes in MgB2
• The Superconducting Gap in MgB_2: Electronic Raman Scattering Measurements of Single Crystals
• de Haas-van Alphen effect in single crystal MgB_2
• Anharmonic phonon frequency shift in MgB2
• Phonons in MgB2 by Polarized Raman Scattering on Single Crystals
• Determination of the Fermi Surface of MgB${}_2$ by the de Haas-van Alphen effect
• Extreme Electron-Phonon Coupling in Boron-based Layered Superconductors

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