Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nodal superconductivity in Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ induced by
  isovalent Ru substitution   We present the ultra-low-temperature heat transport study of an iron-based
superconductor Ba(Fe$_{0.64}$Ru$_{0.36}$)$_2$As$_2$ ($T_c$ = 20.2 K), in which
the superconductivity is induced by isovalent Ru substitution. In zero field we
find a large residual linear term $\kappa_0/T$, more than 40% of the
normal-state value. At low field, the $\kappa_0/T$ shows an $H^{1/2}$
dependence. These provide strong evidences for nodes in the superconducting gap
of Ba(Fe$_{0.64}$Ru$_{0.36}$)$_2$As$_2$, which mimics that in another
isovalently substituted superconductor BaFe$_2$(As$_{1-x}$P$_x$)$_2$. Our
results show that the isovalent Ru substitution can also induce nodal
superconductivity in BaFe$_2$As$_2$, as P does, and they may have the same
origin. We further compare them with other two nodal superconductors LaFePO and
LiFeP.

22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg