Abstract
Temperature and magnetic field dependence of Raman scattering spectra of Cu(Ge1-xSix)O3 has been measured for x = 0, 0.005, 0.008, 0.01, 0.015 and 0.02. For x≠0, zone-folded phonons due to the unit cell doubling appear at higher temperature (Tl) than the spin-Peierls transition temperature (TSP) and Tl increases with an increase of x. The coupling between magnetic fluctuation and phonon is estimated from the peak at about 100 cm-1 using the Fano formula, and the obtained coupling is almost independent of x. These results show that the suppression of TSP by Si-doping is mainly caused by the dimensional change of the magnetic interactions from one to three dimensions. The magnetic field dependence clarifies that the peak at 30 cm-1 is the soft phonon mode, not the SP gap excitation.
Original language | English |
---|---|
Pages (from-to) | 832-834 |
Number of pages | 3 |
Journal | Physica B: Condensed Matter |
Volume | 263-264 |
DOIs | |
Publication status | Published - Mar 1999 |
Externally published | Yes |
Event | Proceedings of the 1998 9th International Conference on Phonon Scattering in Condensed Matter, PHONONS 98 - Lancaster, Great Britain Duration: Jul 26 1998 → Jul 31 1998 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering