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We present a Raman scattering study of the E2g phonon anharmonicity and ofsuperconductivity induced self-energy effects in MgB2 single crystals. We showthat anharmonic two phonon decay is mainly responsible for the unusually largelinewidth of the E2g mode. We observe ~ 2.5 % hardening of the E2g phononfrequency upon cooling into the superconducting state and estimate theelectron-phonon coupling strength associated with this renormalization.Comment: 4 pages, 3 figures, accepted to PR

physical review. b, condensed matter and materials physics

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Anharmonicity and self-energy effects of theE2gphonon inMgB2