Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of the superconducting fluctuations in optimally-doped
  BaFe$_{2-x}$Ni$_x$As$_2$ under high magnetic fields: Probing the 3D
  anisotropic Ginzburg-Landau approach   The superconducting fluctuations well inside the normal state of Fe-based
superconductors were experimentally studied through the in-plane
paraconductivity in several high-quality optimally-doped
BaFe$_{2-x}$Ni$_x$As$_2$ crystals. These measurements were performed in
magnetic fields with amplitudes up to 14 T, and different orientations relative
to the crystals c axis (0, 53 and 90 degrees). The results allowed a stringent
check of the applicability of a recently proposed Ginzburg-Landau approach for
the fluctuation electrical conductivity of 3D anisotropic materials in presence
of finite applied magnetic fields.

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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ