Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural Disorder and Elementary Magnetic Properties of Triangular
  Lattice ErMgGaO4 Single Crystals   The single crystal growth, structure, and basic magnetic properties of
ErMgGaO4 are reported. The structure consists of triangular layers of magnetic
ErO6 octahedra separated by a double layer of randomly occupied non-magnetic
(Ga,Mg)O5 bipyramids. The Er atoms are positionally disordered. Magnetic
measurements parallel and perpendicular to the c axis of a single crystal
reveal dominantly antiferromagnetic interactions, with a small degree of
magnetic anisotropy. A weighted average of the directional data suggests an
antiferromagnetic Curie Weiss temperature of approximately -30 K. Below 10 K
the temperature dependences of the inverse susceptibilities in the in-plane and
perpendicular-to plane directions are parallel, indicative of an isotropic
magnetic moment at low temperatures. No sign of magnetic ordering is observed
above 1.8 K, suggesting that ErMgGaO4 is a geometrically frustrated magnet.

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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga