TEMPERATURE-DEPENDENCE OF RAMAN-ACTIVE MODES IN CUGEO3

Authors
DEVIC SD POPOVIC ZV POPOV VN DHALENNE G REVCOLEVSCHI A
Citation
Sd. Devic et al., TEMPERATURE-DEPENDENCE OF RAMAN-ACTIVE MODES IN CUGEO3, Solid state communications, 102(8), 1997, pp. 599-604
Citations number
21
Categorie Soggetti
Physics, Condensed Matter
Journal title
Solid state communications → ACNP
ISSN journal
00381098
Volume
102
Issue
8
Year of publication
1997
Pages
599 - 604
Database
ISI
SICI code
0038-1098(1997)102:8<599:TORMIC>2.0.ZU;2-3
Abstract
The Raman scattering spectra of CuGeO3 were studied in a wide temperat ure range (20-300 K). Significant phonon frequency shifts were observe d in the case of the A(g) modes at 187 and 859 cm(-1), the B-lg mode a t 224 cm(-1) and the B-3g mode at 388 cm(-1). Only the mode at 859 cm( -1) softens, while the remaining three modes harden with decreasing te mperature. The asymmetry observed in the A(g) symmetry phonon lines is interpreted as the interference of the phonon modes with the continuu m excitations of magnetic origin. (C) 1997 Elsevier Science Ltd.