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

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