Effect of pressure on the Raman anomaly of zinc-blende CuBr and Raman spectra of high-pressure phases -: art. no. 064301

被引：16

作者：

Manjón, FJ ^{[1
]}

Serrano, J ^{[1
]}

Loa, I ^{[1
]}

Syassen, K ^{[1
]}

Lin, CT ^{[1
]}

Cardona, M ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.64.064301

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Raman spectra of isotopically pure CuBr (Cu-63 Br-81) were measured under hydrostatic pressures up to 10 GPa at 10 K. The anomalous line shape of the longitudinal-optic (LO) scattering in the zinc-blende phase (CuBr-III, 0-4 GPa), consisting of a broad structure between 155 and 177 cm(-1), exhibits a continuous change with pressure and develops into a narrow LO phonon peak near 4 GPa. The disappearance of the LO Raman anomaly as well as the pronounced broadening of the TO mode with pressure are explained in terms of pressure-dependent third-order anharmonic interactions with two-phonon states. A Fermi resonance model, which is based on a shell model fit of available phonon dispersion data, fully accounts for the changes in Raman line shapes under pressure. Low-temperature Raman spectra of the tetragonal CuBr-IV and cubic CuBr-V high-pressure phases are also reported. An assignment of the observed Raman modes of these phases is proposed.

引用

页码：643011 / 643019

页数：9

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