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• W2089891601 abstract "Photoinduced phase transitions in spin-Peierls (SP) systems of alkali $(M=mathrm{K},mathrm{Na})$-tetracyanoquinodimethane (TCNQ) have been studied by a reflection-type femtosecond (fs) pump-probe spectroscopy. The SP phase is destabilized by the generation of photocarriers through the breaking of the spin-singlet states in dimers. It results in the decrease of the dimeric molecular displacements within a few hundred of femtoseconds over several tens of TCNQ molecules. It is accompanied by the displacive-type coherent oscillations, which consist mainly of three modes with the frequencies of 20, 49, and $90phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ in K-TCNQ and of two modes with the frequencies of 49 and $99phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ in Na-TCNQ. By taking into account the temperature dependence of the Raman scattering spectra, the mode with $20phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ in K-TCNQ and the modes with 49 and $99phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ in Na-TCNQ are assigned to the phonon modes in the SP ground state, while the modes with 49 and $90phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ in K-TCNQ are assigned to the local modes originating from the photoexcited states. Polarization dependence of the Raman scattering signals shows that the $20text{ensuremath{-}}{mathrm{cm}}^{ensuremath{-}1}$ mode of K-TCNQ and the $49text{ensuremath{-}}{mathrm{cm}}^{ensuremath{-}1}$ mode of Na-TCNQ are longitudinal optical (LO) modes, whereas the $99text{ensuremath{-}}{mathrm{cm}}^{ensuremath{-}1}$ mode of Na-TCNQ is a transverse optical (TO) mode. Namely, the LO mode plays an important role on the stabilization of the SP phase in K-TCNQ, while both the LO and TO modes in Na-TCNQ. Such a difference is discussed by scrutinizing the difference of the crystal structures and the nature of the SP transitions in the two compounds." @default.
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• W2089891601 date "2007-08-06" @default.
• W2089891601 modified "2023-10-17" @default.
• W2089891601 title "Ultrafast photoinduced melting of spin-Peierls phase in the organic charge-transfer compounds alkali-tetracyanoquinodimethane" @default.
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• W2089891601 doi "https://doi.org/10.1103/physrevb.76.085106" @default.
• W2089891601 hasPublicationYear "2007" @default.
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