Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple lattice instabilities resolved by magnetic-field and disorder
  sensitivities in cubic paramagnetic phase of the orbital-degenerate
  frustrated spinel MgV$_2$O$_4$   Ultrasound velocity measurements of the orbital-degenerate frustrated spinel
MgV$_2$O$_4$ are performed in the high-purity single crystal which exhibits
successive structural and antiferromagnetic phase transitions, and in the
disorder-introduced single crystal which exhibits spin-glass-like behavior. The
measurements reveal that two-types of unusual temperature dependence of the
elastic moduli coexist in the cubic paramagnetic phase, which are resolved by
magnetic-field and disorder sensitivities: huge Curie-type softening with
decreasing temperature, and concave temperature dependence with a
characteristic minimum. These elastic anomalies suggest the coupling of lattice
to coexisting orbital fluctuations and orbital-spin-coupled excitations.

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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
32
The categories of this paper are: atom-ph