Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Magnetic Spin Ladder (C_{5}H_{12}N)_{2}CuBr_{4}: High Field
  Magnetization and Scaling Near Quantum Criticality   The magnetization, $M(H \leq 30$ T, 0.7 K $\leq T \leq 300$ K), from single
crystals and powder samples of (C$_{5}$H$_{12}$N)$_{2}$CuBr$_{4}$ has been used
to identify this system as an $S=1/2$ Heisenberg two-leg ladder in the strong
coupling limit, $J_{\perp} = 13.3$ K and $J_{\parallel} = 3.8$ K, with $H_{c1}
= 6.6$ T and $H_{c2} = 14.6$ T. An inflection point in $M(H, T = 0.7$ K) at
half-saturation, $M_{s}/2$, is described by an effective \emph{XXZ} chain. The
data exhibit universal scaling behavior in the vicinity of $H_{c1}$ and
$H_{c2}$, indicating the system is near a quantum critical point.

25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga