Abstract
Charge density waves (CDW’s) are known to occur in both quasi one- and two-dimensional materials the best studied examples of which are K2Pt (CN)4Br0.3.3.2H2O (KCP)and 2H-TaSe2, respectively (1). For studying the dynamic excitations of the CDW’s, called CDW modes, light scattering turns out to be a most useful technique. Its wave-vector resolution is of the order of 5×10-5 Å-1, which is 103 times better than inelastic neutron scattering; such a high resolution is needed for an unambiguous analysis of the eigenfrequencies because of the considerable dispersion near the distortional wavevector.
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For introduction to this topic the reader is referred to the lectures by F.J. Di Salvo and by W.L. McMillan.
E.F. Steigmeier, R. Loudon, G. Harbeke, H. Auderset and G. Scheiber, Solid State Comm. 17, 1447 (1975).
E.F. Steigmeier, D. Baeriswyl, G. Harbeke, H. Auderset and G. Scheiber, Solid State Comm. 20, 661 (1976).
K. Carneiro, G. Shirane, S.A. Werner and S. Kaiser, Phys. Rev. B 13, 4258 (1976).
E.F. Steigmeier, G. Harbeke, H. Auderset and F.J. Di Salvo, Solid State Comm. 20, 667 (1976).
This assignment differs from the one made in the lecture of W.L. McMillan. See also J.A. Holy, M.V. Klein, W.L. McMillan and S.F. Meyer, Phys. Rev. Letters 37, 1145 (1976).
Previously such a proportionality between soft mode frequency and order parameter had been reported for the antiferro-distortive transition in SrTiO3 by E.F. Steigmeier, H. Auderset and G. Harbeke in Anharmonic Lattices, Structural Transitions and Melting, ed. by T. Riste, NATO-ASI (Noordhoff Publishing Leiden 1974) p. 153.
Lecture of W.L. McMillan.
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© 1977 Plenum Press, New York
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Steigmeier, E.F., Harbeke, G., Auderset, H. (1977). Light Scattering by Charge Density Wave Modes in KCP and 2H-TaSe2 . In: Riste, T. (eds) Electron-Phonon Interactions and Phase Transitions. NATO Advanced Study Institutes Series, vol 29. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8921-1_8
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DOI: https://doi.org/10.1007/978-1-4615-8921-1_8
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