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

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

2007-01-04

arxiv.org/abs/cond-mat/0701085v1

PRB 75, 020509(R) (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, accepted to PRB

Scientific paper

10.1103/PhysRevB.75.020509

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.

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