Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Frustrated diamond-chain quantum $XXZ$ Heisenberg antiferromagnet in a
  magnetic field   We consider the antiferromagnetic spin-1/2 $XXZ$ Heisenberg model on a
frustrated diamond-chain lattice in a $z$- or $x$-aligned external magnetic
field. We use the strong-coupling approach to elaborate an effective
description in the low-temperature strong-field regime. The obtained effective
models are spin-1/2 $XY$ chains which are exactly solvable through the
Jordan-Wigner fermionization. We perform exact-diagonalization studies of the
magnetization curves to test the quality of the effective description. The
results may have relevance for the description of the azurite spin-chain
compound.

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The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
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The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph