Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Whirling spin order in the quasicrystal approximant
  Au$_{72}$Al$_{14}$Tb$_{14}$   Neutron powder diffraction experiment has been performed on the quasicrystal
approximant Au$_{72}$Al$_{14}$Tb$_{14}$, a body-center-cubic crystal of
icosahedral spin clusters. The long-range antiferromagnetic order was confirmed
at the transition temperature $T_{\rm N} = 10.4$ K. The magnetic structure
consists of noncoplanar whirling spins on the icosahedral clusters, arranging
antiferroic-manner. A simple icosahedral spin-cluster model with uniaxial
anisotropy accounts well the whirling spin order as well as the in-field
metamagnetic transition, indicating that the icosahedral symmetry is essential.

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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: stat