Far-infrared dielectric response of Rb_0.75(ND₄)_0.25D₂PO₄

S. Kamba Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 180 40, Prague 8, Czech Republic

J. Petzelt Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 180 40, Prague 8, Czech Republic

V. žlezný Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 180 40, Prague 8, Czech Republic

F. Smutný Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 180 40, Prague 8, Czech Republic

B. P. Gorshunov Institute of General Physics, Russian Academy of Sciences, Vavilov street, 117 942, Moscow, Russia

G. V. Kozlov Institute of General Physics, Russian Academy of Sciences, Vavilov street, 117 942, Moscow, Russia

V. V. Voitsekhovskii Institute of General Physics, Russian Academy of Sciences, Vavilov street, 117 942, Moscow, Russia

A. A. Volkov Institute of General Physics, Russian Academy of Sciences, Vavilov street, 117 942, Moscow, Russia

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Abstract

Far-infrared and near-millimetre dielectric response of Rb_0.75(ND₄)_0.25D₂PO₄ (DRADP-25) has been determined by evaluation of reflectivity (30-650 cm⁻¹) and complex transmittance (9-23 cm⁻¹) spectra at temperatures of 10-300 K. In addition to polar phonons, the submillimetre response shows an overdamped soft mode like in DRADP-50. Due to this soft mode, the low-frequency dielectric data (10⁴-10⁷Hz) show a broad permittivity maximum near 145 K. Another lower-frequency dispersion, specific for the dipolar glass phase, was observed below 100 K.

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Far-infrared dielectric response of Rb_0.75(ND₄)_0.25D₂PO₄

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Far-infrared dielectric response of Rb_0.75(ND₄)_0.25D₂PO₄