Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic order and spin dynamics in La2O2Fe2OSe2 probed by
  57Fe-Moessbauer, 139La-NMR, and muon spin relaxation spectroscopy   We present a detailed local probe study of the magnetic order in the
oxychalcogenide La2O2Fe2OSe2 utilizing 57Fe Moessbauer, 139La NMR, and muon
spin relaxation spectroscopy. This system can be regarded as an insulating
reference system of the Fe arsenide and chalcogenide superconductors. From the
combination of the local probe techniques we identify a non-collinear magnetic
structure similar to Sr2F2Fe2OS2. The analysis of the magnetic order parameter
yields an ordering temperature TN = 90.1 K and a critical exponent of beta =
0.133, which is close to the 2D Ising universality class as reported in the
related oxychalcogenide family.

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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg