Raman spectrum and lattice parameters of MgB2 as a function of pressure

Abstract

We report Raman spectra and synchrotron x-ray diffraction measurements of lattice parameters of polycrystalline MgB2 under hydrostatic pressure conditions up to 15 GPa. An anomalously broadened Raman band at 620 cm-1 is observed that exhibits a large linear pressure shift of its frequency. The large mode damping and Gruneisen parameter indicate a highly anharmonic nature of the mode, broadly consistent with theoretical predictions for the E2g in-plane boron stretching mode. The results obtained may provide additional constraints on the electron-phonon coupling in the system.

3 pages, 3 figures

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• Crystal structure and lattice dynamics of AlB2 under pressure and implications for MgB2
• MgB_2 under pressure: phonon calculations, Raman spectroscopy, and optical reflectance
• Electron-phonon coupling and phonon self-energy in MgB${}_2$: do we really understand MgB${}_2$ Raman spectra ?
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• Ultrafast Hot Phonon Dynamics in MgB${}_2$ Driven by Anisotropic Electron-Phonon Coupling
• Tuning topological disorder in MgB${}_2$
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• Effects of pressure on the superconducting properties of magnesium diboride
• Anharmonicity and self-energy effects of the E2g phonon in MgB2
• Ab initio calculation of low-energy collective charge-density excitations in MgB2
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• Electron-phonon coupling strength from ab initio frozen-phonon approach
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• Multi-Gap Superconductivity in MgB2: Magneto-Raman Spectroscopy
• Search for E_2g phonon modes in MgB_2 single crystals by point-contact spectroscopy
• Aluminium substitution induced superstructures in Mg1-xAlxB2 (x = 0.0 to 0.50): An X-ray diffraction study
• Raman spectra of MgB2 at high pressure and topological electronic transition
• Anharmonic theory of superconductivity and its applications to emerging quantum materials
• Thermoelectric power of MgB${}_{2-x}$Be${}_x$
• Study of pressure effect on the magnetic penetration depth in MgB${}_2$
• Pressure dependence of critical temperature in MgB2 and two bands Eliashberg theory
• Possible superlattice formation in high-temperature treated carbonaceous MgB2 at elevated pressure
• Raman Scattering Investigation of Electron Phonon Coupling in Carbon substituted MgB2
• Isotope Effect on Electron-Phonon Interaction in Multiband Superconductor MgB2
• Accurate Electron-phonon Interactions from Advanced Density Functional Theory
• Effect of interband interactions of phonon and charge fluctuation on superconducting parameters of MgB2
• Pressure Effects and Large Polarons in Layered MgB_2 Superconductor
• Overscreening-free electron-phonon interaction in realistic materials
• Properties and challenges of hot-phonon physics in metals: MgB${}_2$ and other compounds