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

Statistical Mechanics 2009-11-07 v1
Authors: T. Markovich , E. Polturak , J. Bossy , E. Farhi
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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.

Keywords

bcc solid 4He inelastic neutron scattering phonons optic-like mode quantum solid localized excitations

Cite

@article{arxiv.cond-mat/0203086,
  title  = {Observation of a new excitation in bcc solid 4He by inelastic neutron scattering},
  author = {T. Markovich and E. Polturak and J. Bossy and E. Farhi},
  journal= {arXiv preprint arXiv:cond-mat/0203086},
  year   = {2009}
}

Comments

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

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