Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical Field Determination in Organic Antiferromagnet F4BImNN   A combination of magnetic heat capacity measurements versus temperature under
multiple fixed external fields using a polycrystalline sample, plus easy and
hard axis aligned magnetization versus field measurements using a single
crystal of the radical
2-(4,5,6,7-tetrafluorobenzimidazol-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl)
at multiple fixed temperatures below 0.75 K, confirmed a zero-field Neel
temperature of TN(0) = 0.73 K, with extrapolated 0 K critical field parameters
of Hc(parallel) = 170 Oe and Hc(perpendicular) = 306 Oe. Assuming the
previously determined 1D intrachain ferromagnetic exchange interaction of J =
+22 K between radicals (Hamiltonian H = -2J {\Sigma}Si . Sj), , the interchain
exchange in antiferromagnetic with 2zJinter = -0.09 K.

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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
3
The categories of this paper are: physics
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The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph