Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ESR studies on the spin-liquid candidate
  $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_{3}$: anomalous response below $T=8$ K   The organic conductor $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_{3}$ seems to form a
quantum spin liquid, although at low temperatures unusual properties are seen
in the charge, spin and lattice degrees of freedom. Here we report results of
X-band ESR studies of $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_{3}$ single crystals
as a function of temperature and angle. We find indications of two anisotropic
relaxation mechanisms at low temperatures and compare them to the spin-liquid
behavior observed in other strongly correlated systems. In addition, we can
recognize charge inhomogeneities in the copper ions of the anion layer. This
disorder might be linked to the dielectric response measured in this compound.

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The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
2
The categories of this paper are: math