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- W2319323928 abstract "Dielectric permittivity, $ensuremath{epsilon}={ensuremath{epsilon}}^{ensuremath{'}}ensuremath{-}i{ensuremath{epsilon}}^{ensuremath{''}},$ of ${mathrm{KH}}_{2}{mathrm{PO}}_{4}$ pressed powders was measured between $T=1.4$ and 25 K in the presence of dc electric bias fields. Usually if the bias was switched at time $t=0, {ensuremath{epsilon}}^{ensuremath{'}}$ and ${ensuremath{epsilon}}^{ensuremath{''}}$ jumped to new values, then decreased approximately as $mathrm{log}t(6<t<2000 mathrm{s}).$ This well-known effect, that is also found with single crystals, is attributed to switchable microdomains that are present accidentally in crystals but are systematically more numerous in powders. A very different aftereffect was observed in a narrow T range around 7--8 K. ${ensuremath{epsilon}}^{ensuremath{'}}$ jumped to a lower value, then increased with t according to a stretched exponential with a T-dependent time constant. This lay near the extrapolation of the Arrhenius law of a known but unassigned weak-field dispersion that is a property of polydomain single crystals as well as powders. The weak-field dispersion is attributed to the elementary movement of a jog on a lateral step displacement of a domain wall, consisting of a single H-bond reversal. The anomalous aftereffect results from the interaction between these point defects and the microdomain system." @default.
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- W2319323928 date "2000-03-01" @default.
- W2319323928 modified "2023-09-25" @default.
- W2319323928 title "Anomalous dielectric aftereffect in ferroelectricKH2PO4" @default.
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- W2319323928 doi "https://doi.org/10.1103/physrevb.61.6547" @default.
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