Markovich T, Polturak E, Bossy J, Farhi E. Observation of a new excitation in bcc 4He by inelastic neutron scattering.
PHYSICAL REVIEW LETTERS 2002;
88:195301. [PMID:
12005643 DOI:
10.1103/physrevlett.88.195301]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2002] [Indexed: 05/23/2023]
Abstract
We report neutron-scattering measurements of the phonons in bcc solid 4He. In general, only three acoustic phonon branches should exist in a monatomic cubic crystal. In addition to these phonon branches, we found a new "opticlike" 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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