Raman spectrum and lattice parameters of MgB2 as a function of pressure

Alexander F. Goncharov; Viktor V. Struzhkin; Eugene Gregoryanz; Jingzhu Hu; Russell J. Hemley; Ho-kwang Mao; G. Lapertot; S. L. Bud'ko; P. C. Canfield

doi:10.1103/PhysRevB.64.100509

Raman spectrum and lattice parameters of MgB2 as a function of pressure

Superconductivity 2009-11-07 v2

Authors: Alexander F. Goncharov , Viktor V. Struzhkin , Eugene Gregoryanz , Jingzhu Hu , Russell J. Hemley , Ho-kwang Mao , G. Lapertot , S. L. Bud'ko , P. C. Canfield

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Abstract

We report Raman spectra and synchrotron x-ray diffraction measurements of lattice parameters of polycrystalline MgB2 under hydrostatic pressure conditions up to 15 GPa. An anomalously broadened Raman band at 620 cm-1 is observed that exhibits a large linear pressure shift of its frequency. The large mode damping and Gruneisen parameter indicate a highly anharmonic nature of the mode, broadly consistent with theoretical predictions for the E2g in-plane boron stretching mode. The results obtained may provide additional constraints on the electron-phonon coupling in the system.

Keywords

Raman spectroscopy pressure lattice parameters MgB2 phonon electron-phonon coupling

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@article{arxiv.cond-mat/0104042,
  title  = {Raman spectrum and lattice parameters of MgB2 as a function of pressure},
  author = {Alexander F. Goncharov and Viktor V. Struzhkin and Eugene Gregoryanz and Jingzhu Hu and Russell J. Hemley and Ho-kwang Mao and G. Lapertot and S. L. Bud'ko and P. C. Canfield},
  journal= {arXiv preprint arXiv:cond-mat/0104042},
  year   = {2009}
}

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3 pages, 3 figures

Raman spectrum and lattice parameters of MgB2 as a function of pressure

Abstract

Keywords

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