Abstract
Dielectric permittivity and remanent polarization measurements have been performed in deuterated rubidium ammonium dihydrogen arsenate with x=0.28. Upon cooling the crystal, there is only the ``transition'' to the deuteron glass state. Static permittivity measurements were carried out along the a tetragonal axis at two different heating and cooling rates. Applying an external dc electric field along the a axis creates a bias which forces the acid deuteron in the O-D...O bond to lie at one end as opposed to the other as the temperature is lowered. This gives rise to a static permittivity (\ensuremath{\approxeq}polarization and/or field) which freezes in below the glass ``transition'' temperature ${\mathit{T}}_{\mathit{g}}$. On switching the external electric field off, a remanent polarization is observed which vanishes above ${\mathit{T}}_{\mathit{g}}$ as the ``frozen'' deuterons acquire more and more energy to overcome the random potential barriers. A theoretical fit with one adjustable parameter is seen to be in good agreement with the experimental results.
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