Giant phonon anomalies in the bond-stretching branches in Ba_0.6K_0.4BiO_3

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dc.creatorBraden, M.
dc.creatorReichardt, W.
dc.creatorShiryaev, S.
dc.creatorBarilo, S. N.
dc.date2001-07-24
dc.date.accessioned2026-07-07T02:42:16Z
dc.date.available2026-07-07T02:42:16Z
dc.descriptionThe dispersion of the longitudinal bond-stretching (BS) branches in superconducting Ba0.6K0.4BiO3 (BKBO) studied by inelastic neutron scattering reveals giant phonon anomalies. In the [110] and [111] directions these branches even split close to the middle of the zone, in contradiction to any harmonic lattice dynamical model with cubic symmetry. The additional low energy branch in the [111] direction ends at the R-point with a frequency near 10.5THz representing a doping induced renormalization of a breathing type vibration by about 40%, the strongest observed so far in any superconductor.
dc.descriptionRec-Tex, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0107498
dc.identifierhttp://arxiv.org/abs/cond-mat/0107498
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/18069
dc.subjectSuperconductivity
dc.titleGiant phonon anomalies in the bond-stretching branches in Ba_0.6K_0.4BiO_3
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