Anharmonicity and self-energy effects of the E2g phonon in Mg B2

A. Mialitsin, B. S. Dennis, N. D. Zhigadlo, J. Karpinski, Girsh Blumberg

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Abstract

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 languageEnglish (US)
Article number020509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number2
DOIs
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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