Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The dynamics of azurite Cu$_3$(CO$_3$)$_2$(OH)$_2$ in a magnetic field
  as determined by neutron scattering   Azurite, a natural mineral made up of CuO chains, is also an intriguing
spin-1/2 quantum magnet. There has been much debate as to the 1-dimensional
(1D) nature of this material by theorists and experimentalists alike. The focus
of this debate lies in the interactions between Cu-ions within the
antiferromagnetically ordered state below 1.9 K. We present high-resolution
inelastic neutron scattering data which highlight the complexity of the
magnetic ground state of azurite. The application of magnetic fields and
temperatures were used to probe the excitations revealing important information
about the dynamics in this system. From this we are able to conclude that the
1D Heisenberg antiferromagnetic spin chain model is not sufficient to describe
the dynamics in azurite. Instead additional coupling including interchain
interactions and an anisotropic staggered field are necessary to fully model
the observed excitations.

11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
19
The categories of this paper are: eess
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg