Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monte Carlo simulations of ${\rm Rb_2MnF_4}$, a classical Heisenberg
  antiferromagnet in two-dimensions with dipolar interaction   We study the phase diagram of a quasi-two dimensional magnetic system ${\rm
Rb_2MnF_4}$ with Monte Carlo simulations of a classical Heisenberg spin
Hamiltonian which includes the dipolar interactions between ${\rm Mn}^{2+}$
spins. Our simulations reveal an Ising-like antiferromagnetic phase at low
magnetic fields and an XY phase at high magnetic fields. The boundary between
Ising and XY phases is analyzed with a recently proposed finite size scaling
technique and found to be consistent with a bicritical point at T=0. We discuss
the computational techniques used to handle the weak dipolar interaction and
the difference between our phase diagram and the experimental results.

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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc