Abstract
The phonon responses along the three crystallographic orientations of KH2PO4, 90% deuterated K(H1−xDx)2 PO4 and NH4H2PO4, deduced from the best fit of the factorised form of the dielectric function to the infrared reflectivity spectra, are compared. Results evidence the activity of a low-frequency heavily damped extra-mode in both directions parallel and perpendicular to the c axis, due to the coupling of an internal mode with the inter-site protonic motion and external models.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
I.P. Kaminow and T.C. Damen, Phys. Rev. Letters20, 1105 (1968).
P.S. Peercy, Phys. Rev. Letters31, 379 (1973).
F. Bréhat and A. Hadni, Comptes Rendus271, 1137 (1970).
F. Bréhat, A. Hadni, J. Aubry and M. Zanne, Rev. Phys. Appl.7, 163 (1972).
F. Bréhat, Thesis University of Nancy (1972).
M. Tokunaga and I. Tatsuzaki, Phase Transitions4, 97 (1984).
M. Tokunaga, Y. Tominaga and I. Tatsuzaki, Ferroelectrics63, 171 (1985).
M. El Sherif, F. Bréhat, B. Wyncke and A. Hadni, Internat. J. Infrared and Millimeter Waves5, 815 (1984).
F. Bréhat and B. Wyncke, Phys. Stat. Sol.(b) 128, 83 (1985).
B. Wyncke and F. Bréhat, J. Phys. C19, 2649 (1986).
B. Wyncke, F. Bréhat, H. Arbouz and E.V. Chisler, Internat. J. Infrared and Millimeter Waves7, 1047 (1986).
B. Wyncke, F. Bréhat and H. Arbouz, Phys. Stat. Sol. (b)134, 523 (1986).
F. Bréhat, B. Wyncke and H. Arbouz, J. Phys. C, in press (1986).
P. Simon and F. Gervais, Phys. Rev.B32, 468 (1985); Jap. Journal of Applied Physics24–2, 911 (1985).
R.J. Nelmes, Ferroelectrics53, 207 (1984).
R.J. Nelmes, W.F. Kuhs, C.J. Howard, J.E. Tibballs and T.W. Ryan, J. Phys. C18, L 711 (1985).
A.W. Hewat, Nature246, 90 (1973).
R. Blinc, Z. Naturforsch.41a, 249 (1986).
A.A. Volkov, G.V. Kozlov and S.P. Lebedev, Soviet Phys.-Solid State20, 1166 (1978).
K.E. Gauss, H. Happ and G. Rother, Phys. Stat. Sol. (b)72, 623 (1975).
I.P. Kaminow and G.O. Harding, Phys. Rev.129, 1526 (1963).
A.A. Volkov, G.V. Kozlov, S.P. Lebedev and I.A. Velichko Soviet, Phys.-Solid State21, 1907 (1979).
K.E. Gauss and H. Happ, Phys. Stat. Sol (b)78, 133 (1976).
I.P. Kaminow, Phys. Rev.138, 1539 (1965).
A.A. Volkov, G.V. Kozlov and S.P. Lebedev, Soviet Phys.-Solid State22, 1789 (1980).
M. Kasahara, M. Tokunaga and I. Tatsuzaki, J. Phys. Soc. Japan55, 367 (1986).
P. Simon, Thesis University of Orléans (1986).
F. Bréhat and B. Wyncke, in preparation.
R.J. Nelmes, W.F. Kuhs, C.J. Howard, J.F. Tibbals and T.W. Ryan, J. Phys. C18, L 1023 (1985).
S.R. Andrews and R.A. Cowley, J. Phys. C.19, 615 (1986).
E.M. Brody and H.Z. Cummins, Phys. Rev. Letters21, 1263 (1968).
H. Meister, J. Skalyo, B.C. Frazer and G. Shirane, Phys. Rev.184, 550 (1969).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Brehat, F., Wyncke, B. Low-frequency models in KH2PO4-type crystals. Int J Infrared Milli Waves 8, 155–176 (1987). https://doi.org/10.1007/BF01012551
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01012551