Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant magnetoresistance and extraordinary magnetoresistance in
  inhomogeneous semiconducting DyNiBi   The semiconducting half-Heulser compound DyNiBi shows a negative giant
magnetoresistance (GMR) below 200 K. Except for a weak deviation, this
magnetoresistance scales roughly with the square of the magnetization in the
paramagnetic state, and is related to the metal-insulator transition. At low
temperature, a positive magnetoresistance is found, which can be suppressed by
high fields. The magnitude of the positive magnetoresistance changes slightly
with the amount of impurity phase.

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The categories of this paper are: hep-ph
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The categories of this paper are: math
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
3
The categories of this paper are: physics
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol