Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetotransport in Single Crystal Half-Heusler Compounds   We present the results of electrical resistivity and Hall effect measurements
on single crystals of HfNiSn, TiPtSn, and TiNiSn. Semiconducting behavior is
observed in each case, involving the transport of a small number of highly
compensated carriers. Magnetization measurements suggest that impurities and
site disorder create both localized magnetic moments and extended paramagnetic
states, with the susceptibility of the latter increasing strongly with reduced
temperature. The magnetoresistance is sublinear or linear in fields ranging
from 0.01 - 9 Tesla at the lowest temperatures. As the temperature increases,
the normal quadratic magnetoresistance is regained, initially at low fields,
and at the highest temperatures extending over the complete range of fields.
The origin of the vanishingly small field scale implied by these measurements
remains unknown, presenting a challenge to existing classical and quantum
mechanical theories of magnetoresistance.

9
The categories of this paper are: nlin
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The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph