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

A. Mialitsin; B. S. Dennis; N. D. Zhigadlo; J. Karpinski; G. Blumberg

doi:10.1103/PhysRevB.75.020509

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

Superconductivity 2009-11-13 v1

Authors: A. Mialitsin , B. S. Dennis , N. D. Zhigadlo , J. Karpinski , G. 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 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.

Keywords

Raman scattering E2g phonon anharmonicity self-energy effects electron-phonon coupling MgB2 superconductor

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@article{arxiv.cond-mat/0701085,
  title  = {Anharmonicity and self-energy effects of the E2g phonon in MgB2},
  author = {A. Mialitsin and B. S. Dennis and N. D. Zhigadlo and J. Karpinski and G. Blumberg},
  journal= {arXiv preprint arXiv:cond-mat/0701085},
  year   = {2009}
}

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4 pages, 3 figures, accepted to PRB

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

Abstract

Keywords

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