Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resistivity tensor correlations in the mixed state of electron-doped
  superconductor Nd$_{2-x}$Ce$_x$CuO$_{4+\delta}$   The magnetic-field dependencies of the longitudinal and Hall resistance of
the electron-doped compounds Nd$_{2-x}$Ce$_x$CuO$_{4+\delta}$ in underdoped
region with $x$=0.14 and with varying degrees of disorder ($\delta$) were
investigated. It was established experimentally that the correlation between
the longitudinal electrical resistivity and the Hall resistivity can be
analyzed on the basis of scaling relationships: $\rho_{xy}$($B$)$\sim$
$\rho^{\beta}_{xx}$($B$). For the totality of the investigated single-crystal
films of Nd$_{2-x}$Ce$_x$CuO$_{4+\delta}$/SrTiO$_3$ the universal value
$\beta$=1.5 $\pm$0.4 is found. The observed feature in the electron-doped
two-dimensional systems can be associated both with a displaying of anisotropic
$s$ - wave or $d$-wave pairing symmetry and with a rather strong pinning due to
an essential degree of disorder in the samples under study.

16
The categories of this paper are: stat
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom