Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-temperature magneto-thermal transport investigation of a Ni-based
  superconductor BaNi2As2: Evidence for fully gapped superconductivity   We have performed low-temperature specific heat and thermal conductivity
measurements of the Ni-based superconductor BaNi$_2$As$_2$ ($T_\mathrm{c}$ =
0.7 K) in magnetic field. In zero field, thermal conductivity shows $T$-linear
behavior in the normal state and exhibits a BCS-like exponential decrease below
$T_\mathrm{c}$. The field dependence of the residual thermal conductivity
extrapolated to zero temperature is indicative of a fully gapped
superconductor. This conclusion is supported by the analysis of the specific
heat data, which are well fit by the BCS temperature dependence from
$T_\mathrm{c}$ down to the lowest temperature of 0.1 K.

24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph