Abstract
It is shown by energy- and time-resolved phonon spectroscopy with superconducting tunnelling junctions that acoustic phonon scattering depends on the size of oxygen precipitates in the annealed Czochralski silicon crystals. After thermal treatments around 1050°C we find a series of rather narrow scattering resonances that shift under stress. They are possibly due to electronic excitations of acceptor-like states related to oxygen aggregation.
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