Abstract
Femtosecond Impulsive stimulated Raman scattering of KD2PO4with an optical heterodyne detection has been applied to elucidate the ultra short-time dependence of the response function G(t) associated with a ferroelectric B2soft mode above Tc. In a time region 0200 fs, where the B2mode was excited at t=0 fs, G(t) shows clearly the existence of an initial excitation process followed by a relaxation process well explained in terms of the Debye model. The relaxation process indicates a critical-slowing down with lowering temperature toward Tcin contrast to the initial process independent of temperature due to its mechanical property.
Original language | English |
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Pages (from-to) | 17-21 |
Number of pages | 5 |
Journal | Ferroelectrics |
Volume | 308 |
DOIs | |
Publication status | Published - Jan 1 2004 |
Externally published | Yes |
Keywords
- Debye model
- Impulsive stimulated raman scattering
- Initial excitation process
- KDPO
- Optical heterodyne detection
- Phase transition
- Soft mode
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics