We present a Raman scattering study of the E2g phonon anharmonicity and of superconductivity-induced self-energy effects in Mg B2 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.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2007|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics