Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarized neutron scattering studies of magnetic excitations in
  iron-selenide superconductor (Li$_{0.8}$Fe$_{0.2}$)ODFeSe ($T_c$ = 41 K)   We report polarized neutron scattering measurements of the low energy spin
fluctuations of the iron-selenide superconductor Li$_{0.8}$Fe$_{0.2}$ODFeSe
below and above its superconducting transition temperature $T_c=41$ K. Our
experiments confirmed that the resonance mode near 21 meV is magnetic.
Moreover, the spin excitations are essentially isotropic in spin space at
5$\leq E\leq$ 29 meV in the superconducting and normal states. Our results
suggest that the resonance mode in iron-based superconductors becomes isotropic
when the influence of spin-orbit coupling and magnetic/nematic order is
minimized, similar to those observed in cuprate superconductors.

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The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
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The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom