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Millimeter wave investigation of the complex dielectric constant in DKDP
Author(s) -
Gauss K. E.,
Happ H.
Publication year - 1976
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220780111
Subject(s) - dielectric , amplitude , transverse plane , ferroelectricity , reflection (computer programming) , interferometry , materials science , reflection coefficient , michelson interferometer , condensed matter physics , optics , atomic physics , physics , nuclear magnetic resonance , analytical chemistry (journal) , chemistry , optoelectronics , structural engineering , computer science , programming language , engineering , chromatography
The temperature dependence of the complex dielectric constant in K(H 1− x D x ) 2 PO 4 with x = 0.64 and 0.86 is determined at ω = 4.62 cm −1 (λ = 2.16 mm) for E parallel and transverse to the ferroelectric axis c by measurements of the complex amplitude reflection coefficient using a Michelson interferometer. For E ‖ c the temperature dependence is due to a low frequency mode with a characteristic frequency below 6 cm −1 . Apart from the vicinity of T C the data can reasonably be described with a Debye model. For E ⟂ c the results indicate a temperature dependent transverse protonic mode between 5 and 10 cm −1 . ϵ″ shows a sharp anomalous peak at T C .