Observation of a new excitation in bcc solid 4He by inelastic neutron scattering

Details Observation of a new excitation in bcc solid 4He by inelastic neutron scattering Observation of a new excitation in bcc solid 4He by inelastic neutron scattering

2002-03-05

arxiv.org/abs/cond-mat/0203086v1

Physics

Condensed Matter

Statistical Mechanics

Text and 4 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.195301

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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