Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Frustrated Magnetism of Pharmacosiderite Comprising Tetrahedral Clusters
  Arranged in the Primitive Cubic Lattice   We show that pharmacosiderite is a novel cluster antiferromagnet comprising
frustrated regular tetrahedra made of spin-5/2 Fe3+ ions that are arranged in
the primitive cubic lattice. The connectivity of the tetrahedra and the
inter-cluster interaction of 2.9 K, which is significantly large compared with
the intra-cluster interaction of 10.6 K, gives a unique playground for
frustration physics. An unconventional antiferromagnetic order is observed
below TN ~ 6 K, which is accompanied by a weak ferromagnetic moment and a large
fluctuation as evidenced by Mossbauer spectroscopy. A q = 0 magnetic order with
the total S = 0 for the tetrahedral cluster is proposed based on the
irreducible representation analysis, which may explain the origin of the weak
ferromagnetism and fluctuation.

10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
25
The categories of this paper are: patt-sol
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The categories of this paper are: eess
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con