Phonons in MgB2 by Polarized Raman Scattering on Single Crystals

Abstract

The paper presents detailed Raman scattering study of the unusually broad E2g phonon mode in MgB2 crystal. For the first time, it is shown by the polarized Raman scattering on few-micron-size crystallites with natural faces that the observed broad Raman feature really does obey the selection rules of an E2g mode. Raman spectra on high quality polycrystalline superconducting MgB2 wires reveal a very symmetric E2g phonon line near 615 1/cm with the room temperature linewidth of 260 1/cm only. Additional scattering of different polarization dependence, observed in certain crystallites is interpreted as weighted phonon density of states induced by lattice imperfections.

4 pages + 7 figures

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Cited by in corpus (24)

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• Anharmonic phonon frequency shift in MgB2
• Effect of Al doping on the optical phonon spectrum in Mg(1-x)Al(x)B(2)
• Kohn Anomaly in MgB2 by Inelastic X-Ray Scattering
• Crystal structure and lattice dynamics of AlB2 under pressure and implications for MgB2
• Electron-phonon coupling and phonon self-energy in MgB${}_2$: do we really understand MgB${}_2$ Raman spectra ?
• c-axis Raman Scattering in MgB2: Observation of a Dirty-Limit Gap in the pi-bands
• Anharmonic effects in MgB2? A comparative inelastic X-ray scattering and Raman study
• Ultrafast Hot Phonon Dynamics in MgB${}_2$ Driven by Anisotropic Electron-Phonon Coupling
• Electron-phonon effects on the Raman spectrum in MgB${}_2$
• Extreme Electron-Phonon Coupling in Boron-based Layered Superconductors
• Disorder induced collapse of the electron phonon coupling in MgB${}_2$ observed by Raman Spectroscopy
• Two-phonon contributions to inelastic x-ray scattering spectra of MgB2
• Search for E_2g phonon modes in MgB_2 single crystals by point-contact spectroscopy
• Non-adiabatic effects in the phonon dispersion of Mg 1--x Al x B 2
• Raman spectra of MgB2 at high pressure and topological electronic transition
• Introduction to High-Resolution Inelastic X-Ray Scattering
• LiBC by polarized Raman spectroscopy: Evidence for lower crystal symmetry ?
• Possible superlattice formation in high-temperature treated carbonaceous MgB2 at elevated pressure
• Accurate Electron-phonon Interactions from Advanced Density Functional Theory
• Overscreening-free electron-phonon interaction in realistic materials
• Properties and challenges of hot-phonon physics in metals: MgB${}_2$ and other compounds