Observation of a new excitation in bcc solid 4He by inelastic neutron scattering
T. Markovich, E. Polturak, J. Bossy, E. Farhi
Abstract
We report neutron scattering measurements of the phonons in bcc solid 4He. In general, only 3 accoustic phonon branches should exist in a monoatomic cubic crystal. In addition to these phonon branches, we found a new ''optic-like'' mode along the [110] direction. One possible interpretation of this new mode is in terms of localized excitations unique to a quantum solid.
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