Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heat transport in RbFe2As2 single crystal: evidence for nodal
  superconducting gap   The in-plane thermal conductivity of iron-based superconductor RbFe$_2$As$_2$
single crystal ($T_c \approx$ 2.1 K) was measured down to 100 mK. In zero
field, the observation of a significant residual linear term $\kappa_0/T$ =
0.65 mW K$^{-2}$ cm$^{-1}$ provides clear evidence for nodal superdonducting
gap. The field dependence of $\kappa_0/T$ is similar to that of its sister
compound CsFe$_2$As$_2$ with comparable residual resistivity $\rho_0$, and lies
between the dirty and clean KFe$_2$As$_2$. These results suggest that the
(K,Rb,Cs)Fe$_2$As$_2$ serial superconductors have a common nodal gap structure.

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The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th