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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number100509
Number of pages4
JournalPhysical Review B (Condensed Matter)
Volume64
Issue number10
DOIs
Publication statusPublished - 1 Sep 2001

Keywords

  • GRUNEISEN PARAMETERS
  • STATE
  • SCATTERING
  • EQUATIONS
  • MODES

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