Abstract
New excitation are observed once a charge density wave (CDW) is genp erated in a system following a Peierls transition. In the commensurate case, the following features can be observed:
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a)
Phonon branches folding with possibly new Raman and infrared active phonons 1.
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b)
Raman active amplitude modes of the CDW that behave like soft modes below the point of commensurate second order phase transition.
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c)
Infrared active phase modes of the CDW whose frequency is different from zero for q = o. However, this frequency equals zero in the incommensurate phase unless trere is pinning of the CDW 2.
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Jandl, S. (1987). Infrared and Raman Measurements of CDW in KCP, K0.3 MoO3 and Rb0.3MoO3 . In: Jérome, D., Caron, L.G. (eds) Low-Dimensional Conductors and Superconductors. NATO ASI Series, vol 155. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3611-0_38
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DOI: https://doi.org/10.1007/978-1-4899-3611-0_38
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