Ultrafast Photoinduced Melting of a Spin-Peierls Phase in an Organic Charge-Transfer Compound, K-Tetracyanoquinodimethane

H. Okamoto, K. Ikegami, T. Wakabayashi, Y. Ishige, J. Togo, H. Kishida, and H. Matsuzaki
Phys. Rev. Lett. 96, 037405 – Published 26 January 2006

Abstract

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 20cm1 is due to an LO phonon, and it plays an important role for the stabilization of the SP phase.

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  • Received 6 July 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.037405

©2006 American Physical Society

Authors & Affiliations

H. Okamoto, K. Ikegami, T. Wakabayashi, Y. Ishige, J. Togo, H. Kishida, and H. Matsuzaki

  • Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan

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Issue

Vol. 96, Iss. 3 — 27 January 2006

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