Anharmonicity and self-energy effects of the E2g phonon in MgB2

Abstract

We present a Raman scattering study of the E2g phonon anharmonicity and of superconductivity induced self-energy effects in MgB2 single crystals. We show that anharmonic two phonon decay is mainly responsible for the unusually large linewidth of the E2g mode. We observe ~ 2.5 % hardening of the E2g phonon frequency upon cooling into the superconducting state and estimate the electron-phonon coupling strength associated with this renormalization.

arXiv comment4 pages, 3 figures, accepted to PRB

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• Ground state, collective mode, phase soliton and vortex in multiband superconductors
• Theory of Raman scattering from Leggett's collective mode in a multiband superconductor: Application to MgB${}_2$
• Nonadiabatic coupling effects in MgB${}_2$ reexamined
• Strong interaction between electrons and collective excitations in multiband superconductor MgB2
• High Tc superconductivity in CaKFe${}_4$As${}_4$ in absence of nematic fluctuations
• Anharmonic theory of superconductivity and its applications to emerging quantum materials
• Isotope Effect on Electron-Phonon Interaction in Multiband Superconductor MgB2
• Superconductivity and phonon self-energy effects in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$