Regresar

Effect of pressure on the anomalous Raman spectrum of CuBr

Abstract:

Raman spectra of isotopically pure zinc-blende CuBr (63Cu81Br) were measured at T = 10 K under hydrostatic pressures up to 4 GPa. The ambient-pressure spectrum consists of a transverse-optic (TO) phonon line and an anomalous broad band located at frequencies near the expected first-order longitudinal-optic (LO) scattering. Application of hydrostatic pressure leads to an increase of the linewidth of the TO mode and to a significant change of the LO scattering band which above 3 GPa develops into a single LO phonon peak of narrow linewidth. The disappearance of the LO Raman anomaly as well as the broadening of the TO mode with pressure are explained by pressure-dependent third-order anharmonic interactions of zone-center optical phonons with q = 0 two-phonon states.

Año de publicación:

2001

Keywords:

    Fuente:

    scopusscopus

    Tipo de documento:

    Article

    Estado:

    Acceso restringido

    Áreas de conocimiento:

    • Ciencia de materiales
    • Espectroscopia Raman
    • Espectroscopía

    Áreas temáticas:

    • Química analítica

    Contribuidores:

    Lin C.T.Lin C.T.
    Jorge SerranoJorge Serrano
    Manjón F.J.Manjón F.J.
    Loa I.Loa I.
    Syassen K.Syassen K.
    Cardona M.Cardona M.