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

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

2001-04-02

arxiv.org/abs/cond-mat/0104042v2

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures

Scientific paper

10.1103/PhysRevB.64.100509

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.

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