Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metal-insulator transition and superconductivity induced by Rh doping in
  binary Ru Pnictides RuPn (Pn = P, As and Sb)   Binary ruthenium pnictides, RuP and RuAs, with an orthorhombic MnP structure,
were found to show a metal to a non-magnetic insulator transition at TMI = 270
K and 200 K, respectively. In the metallic region above TMI, a structural phase
transition, accompanied by a weak anomaly in the resistivity and the magnetic
susceptibility, indicative of a pseudo-gap formation, was identified at Ts =
330 K and 280 K, respectively. These two transitions were suppressed by
substituting Ru with Rh. We found superconductivity with a maximum Tc = 3.7 K
and Tc =1.8 K in a narrow composition range around the critical point for the
pseudo-gap phase, Rh content xc = 0.45 and xc = 0.25 for Ru1-xRhxP and
Ru1-xRhxAs, respectively, which may provide us with a novel non-magnetic route
to superconductivity at a quantum critical point.

32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat