Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large magnetic heat transport in a Haldane chain material
  Ni(C$_3H_{10}N_2)_2NO_2ClO_4   We report a study on the heat transport of an S = 1 Haldane chain compound
Ni(C_3H_{10}N_2)_2NO_2ClO_4 at low temperatures and in magnetic fields. The
zero-field thermal conductivities show a remarkable anisotropy for the heat
current along the spin-chain direction (\kappa_b) and the vertical direction
(\kappa_c), implying a magnetic contribution to the heat transport along the
spin-chain direction. The magnetic-field-induced change of the spin spectrum
has obviously opposite impacts on \kappa_b and \kappa_c. In particular,
\kappa_b(H) and \kappa_c(H) curves show peak-like increases and dip-like
decreases, respectively, at \sim 9 T, which is the critical field that
minimizes the spin gap. These results indicate a large magnetic thermal
transport in this material.

37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat