Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tricritical behaviour of the frustrated Ising antiferromagnet on the
  honeycomb lattice   We use the effective-field theory with correlations based on different
cluster sizes to investigate phase diagrams of the frustrated Ising
antiferromagnet on the honeycomb lattice with isotropic interactions of the
strength $J_1 < 0$ between nearest-neighbour pairs and $J_2 < 0$ between
next-nearest neighbour pairs of spins. We present results for the ground-state
energy as a function of the frustration parameter $R = J_2 /|J_1|$. We find
that the cluster-size has a considerable effect on the existence and location
of a tricritical point in the phase diagram at which the phase transition
changes from the second order to the first one.

30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph