Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Point-contact studies of semiconductor $PbTe-PbS$ superconducting
  superlattice as a model of HTS   Superconducting (SC) superlattices (SL) of the epitaxial semiconductor
$PbTe-PbS$/(001) $KCl$ with two-dimensional ordered misfit dislocation (MD)
networks across heteroboundaries (HB) are studied, and the obtained results are
compared with the corresponding data for $YBaCuO$. An analysis of the
fluctuational region showed that the pairing of electrons in SL takes place at
the sites of dislocation networks. In the region of SC fluctuations, the IVC
derivatives of point-contacts (PC) based on SL and HTS display a
metal-insulator transition associated with delocalization of carriers from the
vicinity of the structural elements responsible for the emergence of SC. The
critical current density in a superlattice is determined, and a mechanism is
proposed for formation of excess current on the IVC of PC based on SL and HTS.
The values of the energy gap $\Delta_0$ at low temperatures in units of $kT_c$
are found to be anomalously large for SL and HTS. For anisotropic
three-dimensional SL with a strong bond between two-dimensional SC planes, two
gaps emerge from the MD. For quasi-two-dimensional SL with a weak bond between
two-dimensional SC planes, the $\Delta(T)$ dependence is nonmonotonic, and the
fluctuation region for these SL and for HTS reveals a gap that is practically
independent of temperature. The IVC derivatives of a $Cu$-SL PC reveal an
oscillating structure which is restricted to an energy of $90\ meV$ and is
apparently associated with the electron-phonon interaction. It is assumed that
there is a similarity between the SC mechanisms in SL and HTS. pacs 73.40.Jn,
74.25.Kc, 74.45.+c, 74.50.+r., 73.40.-c, 74.78.-w, 74.78.Fk, 74.20.Mn,
74.40.+k.-n, 74.45.+c, 74.62.Dn, 74.70.Ad

11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci