Abstract
The phonon spectrum of indium along [111], measured by inelastic neutron scattering, is reported. The two shear modes at the zone-boundary point (1/2, 1/2, 1/2) are split slightly (on account of a 7.5% tetragonal distortion). They have very low frequencies, ∼0.7 and 1.0 THz, compared to the longitudinal mode, ∼3.4 THz. These measurements verify the theoretical dispersion predicted by the dynamic pseudopotential theory of phonons for free-electron-like metals.
Original language | English |
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Article number | 052301 |
Pages (from-to) | 523011-523013 |
Number of pages | 3 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 63 |
Issue number | 5 |
DOIs | |
State | Published - 2001 |