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Dielectric relaxation of mixed crystals of Rb1-x(NH4)xH2PO4 at microwave frequencies

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Zeitschrift für Physik B Condensed Matter

Abstract

Measurements of the clamped dielectric constant on mixed single crystals of Rb1-x(NH4)xH2PO4,x=0.35, are reported up to 11 GHz. Between 24 and 60 K, the dielectric dispersion can be fitted to a Cole-Cole relaxation, the parameters of which indicate a temperature-dependent distribution of relaxation times consistent with Vogel-Fulcher freezing. Both the audio and the microwave measurements can be scaled up to ≊ 100 MHz, with a freezing temperature ofT o≅8.4 K. In the GHz range, a relaxation process in addition to the low-frequency freezing mode contributes to the dielectric response.

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Authors and Affiliations

  1. Fachbereich Physik der Universität des Saarlandes, D-6600, Saarbrücken, Federal Republic of Germany

    H. J. Brückner & H. -G. Unruh

  2. IBM Research Division, Zürich Research Laboratory, Säumerstrasse 4, CH-8803, Rüschlikon, Switzerland

    E. Courtens

Authors
  1. H. J. Brückner
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  2. E. Courtens
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  3. H. -G. Unruh
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Brückner, H.J., Courtens, E. & Unruh, H.G. Dielectric relaxation of mixed crystals of Rb1-x(NH4)xH2PO4 at microwave frequencies. Z. Physik B - Condensed Matter 73, 337–342 (1988). https://doi.org/10.1007/BF01314272

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  • DOI: https://doi.org/10.1007/BF01314272

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