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

Research output: Contribution to journalArticle

  • AF Goncharov
  • VV Struzhkin
  • E Gregoryanz
  • JZ Hu
  • RJ Hemley
  • HK Mao
  • G Lapertot
  • SL Bud'ko
  • PC Canfield

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Original languageEnglish
Article number100509
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume64
Issue number10
DOIs
StatePublished - 1 Sep 2001

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 the vibration is highly anharmonic, broadly consistent with theoretical predictions for the E-2g in-plane boron stretching mode. The results obtained may provide additional constraints on the electron-phonon coupling in the system.

    Research areas

  • GRUNEISEN PARAMETERS, STATE, SCATTERING, EQUATIONS, MODES

ID: 11436401