Local distortions in Ba1-xKxBiO3 observed in low frequency phonon Raman scattering

Authors
Pashkevich, YG Gnezdilov, VP Eremenko, AV Lemmens, P Guntherodt, G Reichardt, W Braden, M Shiryaev, SV Barilo, SN Soldatov, AG
Citation
Yg. Pashkevich et al., Local distortions in Ba1-xKxBiO3 observed in low frequency phonon Raman scattering, INT J MOD B, 14(29-31), 2000, pp. 3637-3642
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
ISSN journal
02179792 → ACNP
Volume
14
Issue
29-31
Year of publication
2000
Pages
3637 - 3642
Database
ISI
SICI code
0217-9792(200012)14:29-31<3637:LDIBOI>2.0.ZU;2-3
Abstract
High quality single crystals of Ba1-xKxBiO3 (x=0; 0.15, 0.2, 0.33, 0.42) ha ve been investigated by Raman light scattering in the 5-300 K temperature r ange. All spectra are interpreted as phonon states that are introduced in R aman scattering by folding back of modes from different points of the zone boundary due to structural distortions. Direct comparison of our spectra wi th inelastic neutron scattering data provides clear evidence for the existe nce of local R-type tilt and breathing distortions together with some addit ional distortion possibly related to the M-point.