Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The discovery, disappearance and re-emergence of radiation-stimulated
  superconductivity   We trace the historical fate of experiment and theory of microwave-stimulated
superconductivity as originally reported for constriction-type superconducting
weak links. It is shown that the observed effect disappeared by improving weak
links to obtain the desired Josephson-properties. Separate experiments were
carried out to evaluate the validity of the proposed theory of Eliash'berg for
$\textit{energy-gap-enhancement}$ in superconducting films in a microwave
field, without reaching a full quantitatively reliable measurement of the
stimulated energy gap in a microwave-field, but convincing enough to understand
the earlier deviations from the Josephson-effect. Over the same time-period
microwave-stimulated superconductivity continued to be present in
superconductor-normal metal-superconductor Josephson weak links. This
experimental body of work was left unexplained for several decades and could
only be understood properly after the microscopic theory of the
proximity-effect had matured enough, including its non-equilibrium aspects. It
implies that the increase in critical current in weak-link Josephson-junctions
is due to an $\textit{enhancement of the phase-coherence}$ rather than to an
$\textit{enhancement of the energy-gap}$ as proposed by Eliash'berg. The
complex interplay between proximity-effect and the occupation of states
continuous to be, in a variety of ways, at the core of the ongoing research on
hybrid Josephson-junctions. The subject of radiation-enhanced superconductivity
has re-emerged in the study of the power-dependence of superconducting
microwave resonators, but also in the light-induced emergence of
superconductivity in complex materials.

37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg