Physics – Condensed Matter – Superconductivity
Scientific paper
2001-04-02
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.
Bud'ko Sergey L.
Canfield Paul. C.
Goncharov Alexander F.
Gregoryanz Eugene
Hemley Russell J.
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