Initial excitation process of ferroelectric B2 soft mode in KD2PO4

Jun Kano, Yuhji Tsujimi, Keith A. Nelson, Toshirou Yagi

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Pages (from-to)17-21
Number of pages5
Publication statusPublished - Jan 1 2004
Externally publishedYes


  • 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


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