New Lattice Softening Mechanism in the Quasi-One-Dimensional TCNQ Conductors
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概要
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A 1-d model system embodying the features of the TCNQ conductors is workedout in order to study on the softening of the TA phonon mode caused by theinteraction with the intramolecular electric polarizations of the TCNQ ions.We obtain Green's function for the renormalized phonon mode in two approxi-mate methods and find that this mode is actually softened around the so-called2AF wavenumber. The polarization wave mode softens at this wavenumber, press-ing down the phonon mode, as the electron distribution develops the Wigner-crystal-like short range order with decreasing temperature. This situation issimulated numerically for a simple case and found very similar to that observedexperimentally. Appearance of the spontaneous polarization at 0 K proves asufficient condition for completely softening the phonon mode. The softening inTTF-TCNQ is attributed to the 2-d tight arrangement of the TCNQ moleculesin the 6c-plane. This reasoning is reinforced by a numerical simulation of a 2-dmodel of classical electrons.
- 社団法人日本物理学会の論文
- 1979-09-15
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