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Okamoto, H; Ikegami, K; Wakabayashi, T; Ishige, Y; Togo, J; Kishida, H; Matsuzaki, H
Physical review letters, 01/2006, Volume: 96, Issue: 3Journal Article
Ultrafast photoinduced phase transition in a spin-Peierls (SP) system of K-tetracyanoquinodimethane (K-TCNQ) was studied by femtosecond (fs) reflection spectroscopy. Photocarriers destabilize the SP phase, resulting in a decrease in molecular dimerization within 400 fs. Such a melting of the SP phase drives three kinds of coherent oscillations. By comparing the oscillations with the Raman bands activated by the dimerization, we show that the oscillation of 20 cm-1 is due to an LO phonon, and it plays an important role for the stabilization of the SP phase.
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