Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hysteresis and Anisotropic Magnetoresistance in Antiferromagnetic
  $Nd_{2-x}Ce_xCuO_{4}$   The out-of-plane resistivity ($\rho_c$) and magnetoresistivity (MR) are
studied in antiferromangetic (AF) $Nd_{2-x}Ce_xCuO_{4}$ single crystals, which
have three types of noncollinear antiferromangetic spin structures. The
apparent signatures are observed in $\rho_c(T)$ measured at the zero-field and
14 T at the spin structure transitions, giving a definite evidence for the
itinerant electrons directly coupled to the localized spins. One of striking
feature is an anisotropy of the MR with a fourfold symmetry upon rotating the
external field (B) within ab plane in the different phases, while twofold
symmetry at spin reorientation transition temperatures. The intriguing thermal
hysteresis in $\rho_c(T,B)$ and magnetic hysteresis in MR are observed at spin
reorientation transition temperatures.

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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: econ