Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Field-Induced Magnetic Order and Simultaneous Lattice Deformation in
  TlCuCl3   We report the results of Cu and Cl nuclear magnetic resonance experiments
(NMR) and thermal expansion measurements in magnetic fields in the coupled
dimer spin system TlCuCl3. We found that the field-induced antiferromagnetic
transition as confirmed by the splitting of NMR lines is slightly
discontinuous. The abrupt change of the electric field gradient at the Cl
sites, as well as the sizable change of the lattice constants, across the phase
boundary indicate that the magnetic order is accompanied by simultaneous
lattice deformation.

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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: solv-int
1
The categories of this paper are: cs
3
The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con