Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mixed system $Cs_3Cu_3Cl_{8-x}Br_xOH$ with weakly connected Cu-triangles   To study the relationship between the properties of low-dimensional spin
systems with weakly coupled Cu-triangles and their crystal structure, single
crystals of $Cs_3Cu_3Cl_8OH$ (1) and the new $Cs_3Cu_3Cl_{7.6}Br_{0.4}OH$ (2)
were grown. Both compounds are isostructural and crystallize in a monoclinic
structure with space group $P2_1/c$. The magnetic susceptibility of (1) shows a
maximum at $2.23 K$ and of (2) at $2.70 K$, which are attributed to
antiferromagnetic phase transitions. Furthermore, the magnetization along the
$b$-axis at $1.9 K$ for both compounds shows a spin-flop transition into a new
antiferromagnetic phase. This transition occurs at $0.61 T$ for (1) and at $2.0
T$ for (2). The antiferromagnetic order can be suppressed by a magnetic field
$B_{C1}= 1.1 T$ for (1) and $B_{C2}= 1.2 T$ for (2). First single crystal
neutron diffraction measured on (1) at different temperatures reveals the
magnetic signal on the top of the nuclear reflection at (-1 0 0). Its magnetic
ordering temperature was found to be at $T_{N1}= 2.12(3) K$.

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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
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The categories of this paper are: cs