Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reversible recovery of excess current in $Y(Ho)-Ba-Cu-O$-normal metal
  point contacts under high voltages   A polarity-dependent reversible change in the current-voltage characteristics
between states corresponding to different values of the excess current
${{I}_{exc}}$ is observed for bias voltages of several hundred millivolts in
$Ag-ReB{{a}_{2}}C{{u}_{3}}{{O}_{7-x}}$ $\left( Re\text{ }=\text{ }Y,\text{ }Ho
\right)$ point contacts in the current-carrying state. The observed effect has
a high intensity (right up to a complete suppression or recovery of
${{I}_{exc}}$) and is not accompanied by a noticeable variation of the energy
gap or the critical temperature in the point contact region. It is also
established that the states with intermediate values of $I_{exc}$ are stable
for zero bias voltages across the point contacts, at least up to $110 \ K$. It
is assumed that the variation of ${{I}_{exc}}$ and the corresponding
modification of IVC are due to the oxygen migration processes induced by the
electric field and current, resulting in a local variation of the
superconducting parameters in the point-contact region.

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The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph