Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous dielectric after-effect in ferroelectric KH2PO4   Dielectric permittivity of KH2PO4 single crystals and pressed powders was
measured in the presence of dc electric bias fields. Usually if the bias was
switched at time t = 0, real and imaginary permittivity jumped to new values
then decreased as logt . This well-known 'glassy' effect is attributed to
switchable microdomains that are present accidentally in single crystals but
are systematically more numerous in powders. A very different after-effect was
observed in a narrow T range around 7-8 K. Real permittivity jumped to a lower
value then increased with t as a stretched exponential with a T-dependent time
constant. This lay near the Arrhenius law of a known, but unassigned
dispersion. Such a dispersion is a typical effect of a point defect at low
concentration in a crystal, and is here attributed to the elementary movement
of a domain wall, consisting of a single H-bond reversal. The anomalous
after-effect results from the interaction between these point defects and the
microdomain system. Several other H-bond ferroelectrics exhibited similar
effects. They offer an opportunity to study 'glassy' and 'crystalline' slow
dynamic effects that coexist and interact.

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The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat