Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic order and disorder in a quasi-two-dimensional quantum
  Heisenberg antiferromagnet with randomized exchange   We present an investigation of the effect of randomizing exchange strengths
in the $S=1/2$ square lattice quasi-two-dimensional quantum Heisenberg
antiferromagnet (QuinH)$_2$Cu(Cl$_{x}$Br$_{1-x}$)$_{4}\cdot$2H$_2$O
(QuinH$=$Quinolinium, C$_9$H$_8$N$^+$), with $0\leq x \leq 1$. Pulsed-field
magnetization measurements allow us to estimate an effective in-plane exchange
strength $J$ in a regime where exchange fosters short-range order, while the
temperature $T_{\mathrm{N}}$ at which long range order (LRO) occurs is found
using muon-spin relaxation, allowing us to construct a phase diagram for the
series. We evaluate the effectiveness of disorder in suppressing
$T_{\mathrm{N}}$ and the ordered moment size and find an extended disordered
phase in the region $0.4 \lesssim x \lesssim 0.8$ where no magnetic order
occurs, driven by quantum effects of the exchange randomness.

3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn