Pressure-induced phonon-freezing in the ZnBeSe alloy: a study via the percolation mesoscope

Details Pressure-induced phonon-freezing in the ZnBeSe alloy: a study via the percolation mesoscope Pressure-induced phonon-freezing in the ZnBeSe alloy: a study via the percolation mesoscope

2009-10-27

arxiv.org/abs/0910.5175v2

Phys. Rev. B 81, 115207 (2010)

Physics

Condensed Matter

Materials Science

11 pages, 3 figures

Scientific paper

10.1103/PhysRevB.81.115207

We use the 1-bond -> 2-phonon percolation doublet of zincblende alloys as a mesoscope for an unusual insight into their phonon behavior under pressure. We focus on (Zn,Be)Se and show by Raman scattering that the original Be-Se doublet at ambient pressure, of the stretching-bending type, turns into a pure-bending singlet at the approach of the high-pressure ZnSe-like rocksalt phase, an unnatural one for the Be-Se bonds. The freezing of the Be-Se stretching mode is discussed within the scope of the percolation model (mesoscopic scale), with ab initio calculations in support (microscopic scale).

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