Proton-glass state in K0.60(NH4)0.40H2AsO4 detected by dielectric measurements
Schmidt, V. Hugo
Drumheller, John E.
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Dielectric permittivity measurements of ε′a and ε''a in a K0.60(NH4)0.40H2AsO4 mixed crystal have been made in the temperature and frequency ranges 3–300 K and 1 Hz–30 kHz. We find proton-glass behavior in this material similar to that observed in the Rb1−x(NH4)xH2AsO4 and Rb1−x(NH4)xH2PO4 systems. Below Tg the dielectric dispersion characteristics of the freezing of the polarization are well described phenomenologically by the Vogel-Fulcher law. The best fit gives the Vogel-Fulcher temperature T0=5.4 K, the attempt frequency ν0=2.5×1013 Hz, and the activation energy Ec/k=409 K.
Trybula, Zbigniew, V. Hugo Schmidt, John E. Drumheller, and Robert Blinc. “Proton-glass state in K0.60(NH4)0.40H2AsO4 detected by dielectric measurements.” Phys. Rev. B 42, no. 10 (October 1990): 6733–6735. doi:10.1103/physrevb.42.6733.